MCQs On P-Block Elements

 P-Block Elements

Prepared By: Saif-ur-Rehman Chachar

Question 1
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
A.Zero to – 1 and zero to +3
B.Zero to + 1 and zero to –3
C.Zero to + 1 and zero to –5
D.Zero to – 1 and zero to +5

Question 2
In which of the following compounds, nitrogen exhibits highest oxidation state?
A.N3H
B.NH2OH
C.N2H4
D.NH3

Question 3
Three reactions involving H2PO4- are given below
(i) H3PO4 + H2O ® H3O+ + H2PO4-
(ii) H2PO4- + H2O ® HPO42- + H3O+
(iii) H2PO4- + OH- ® H3PO4 + O2-

In which of the above does H2PO4- act as an acid?
A.(i) only
B.(ii) only
C.(iii) only
D.(i) and (ii)

Question 4
The correct order of increasing bond angles in the following species is [CBSE AIPMT 2010]
A.Cl2O < ClO2 < ClO2-
B.ClO2- < Cl2O < ClO2
C.Cl2O < ClO2- < ClO2
D.ClO2 < Cl2O < ClO2-

Question 5
The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence:
A.BCl3 > BF3 > BBr3
B.BF3 > BCl3 > BBr3
C.BBr3 > BF3 > BCl3
D.BBR3 > BCl3 > BF3

Question 6
P4O10 is the anhydride of
A.H3PO2
B.H3PO3
C.H3PO4
D.H4P2O7

Question 7
Which of the following statements regarding ozone is not correct?
A.The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen
B.The ozone is response hybrid of two structures
C.The ozone molecule is angular in shape
D.Ozone is used as a germicide and disinfectant for the purification of air.

Question 8
Which of the following contains P - O - P bond?
A.Hypophosphorous acid
B.Phosphorous acid
C.Pyrophosphoric acid
D.Orthophosphoric acid

Question 9
Which noble gas is most abundant in atmosphere?
A.He
B.Ne
C.Ar
D.Kr

Question 10
The reaction of P4 with X leads selectively to P4O6. The X is
A.Dry O2
B.A mixture of O2 and N2
C.Moist O2
D.O2 in the presence of aqueous NaOH

Question 11
Which of the following reactions of xenon compounds is not feasible?
A.XeO3 + 6HF ® XeF6 + 3H2O
B.3XeF4 + 6H2O ® 2Xe + XeO3 + 12HF + 1.5O2
C.2XeF2 + 2H2O ® 2Xe + 4HF + O2
D.XeF6 + RbF ® Rb [XeF7]

Question 12
In which of the following arrangements, the sequence is not strictly according to the property written against it?
A.CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing power
B.HF < HCl < HBr < HI : Increasing acid strength
C.NH3 < PH3 < AsH3 < SbH3 : Increasing basic strength
D.B < C < O < N : Increasing first ionization enthalpy

Question 13
Among the following which is the strongest oxidizing agent?
A.Br2
B.I2
C.Cl2
D.F2

Question 14
The brown ring test for nitrates depends on
A.reduction of ferrous sulphate to iron
B.oxidation of nitric oxide to nitrogen dioxide
C.the reduction of nitrate to nitric oxide
D.oxidising action of sulphuric acid

Question 15
One mole of magnesium nitride on the reaction with an excess of water gives:
A.one mole of ammonia
B.one mole of nitric acid
C.two moles of ammonia
D.two moles of nitric acid

MCQs On S-Block Elements-Chemistry

S-Block Elements

Prepared By: Saif-ur-Rehman Chachar

Question 1: Alkali metals form__________compounds.
a ionic
b covalent
c alkali
d metal

Question 2: The atomic and ionic radii___________from Li to Cs.
a increase
b medium
c decreases

Question 3: Cesium___________spontaneously in moist air.
a burns
b does notburn
c heat
d hot

Question 4: Beryl is an ore of_________
a calcium
b strontium
c Aluminum (Be3Al2(SiO3)6)
d beryllium

Question 5: Epsom salt is an ore of _______
a calsium
b lithum
c strontium
d magnesium

Question 6: The elements of group I-A are called alkali metals because their __________ are alkaline
a oxides
b hydroxides
c both
d none of above

Question 7: gypsum is an ore of _______
a calcium
b barium
c magnesium
d lithum

Question 8: Asbestos is an ore of_______________
a magnesium
b calcium
c tritium
d lithium

Question 9: Marble is an ore of ________
a magnesium
b calcium
c barium
d Aluminium

Question 10: The melting and boiling points of alkaline earth metals are ___________ than alkali metals.
a lower
b higher
c greater
d small

Question 11: Sodium amalgam is an alloy of sodium and__________
a mercury
b strontium
c lithium
d aluminium

Question 12: Densities____________ from Li to Cs
a increase
b decreases
c medium

Question 13: The oxidation states of alkali metals are_______
a +1
b +2
c +3
d +4

Question 14: The oxidation states of alkaline earth metals are _________
a +1
b -1
c +2
d -2

Question 15: The alkali earth metals are powerful.......... agents
a oxdizing
b reducing
c strong base
d strong acid
Explanation: Alkali metals are power reducing agents b/c they reduce more powerfully hyrogen,oxygen and chlorine ..ruducing means giving electrons and the atoms which accepts electron would be called as reduced.

MCQs On Hydrogen -Chemistry

Hydrogen

Prepared By: Saif-ur-Rehman Chachar

Question 1: A mixture of carbon monoxide and hydrogen gas is called________gas.
a water gas
b Ammonium gas
c Helium gas
d tear gas

Question 2: Heavy water is used in ______.
a auto mobiles
b nuclear reactors
c atomic reactors

Question 3: Isotopes of all elements differ from each other in their _____________ properties.
a chemical
b Bio chemical
c physical
d Bio physical

Question 4: ____________ is also called heavy hydrogen.
a deuterium
b protuim
c tritium

Question 5: The atomic weight of tritium is __________ amu (1/5/3).
a 3
b 5
c 7
d 1

Question 6: Larger portion of ordinary hydrogen consists of ______
a protuim
b tritiuim
c deuterium

Question 7: Hydrogen has_________ isotopes.
a 1
b 3
c 2
d 4

Question 8: Hydrogen preferably forms.________
a covalent
b ionic
c Basic covalent
d ionic covalent

Question 9: During electrolysis hydrogen gas is deposited at __________
a cathode
b Anode.
c ionic
d covalent

Question 10: Alkali metal hydrides have ________ structures like alkali metalhàlides •
a cubic
b penta
c octa
d hexagonal

Question 11: Hydrogen is a good _________
a acidic
b oxidizing
c basic
d reducing

Question 12: Tritium ____________ radio active isotope.
a is
b are
c is not
d are not

Question 13: The atomic weights of isotopes of all element are different due to different number of________
a electrons
b neutrons
c protons

Question 14: The complex hydrides of the elements of III—A have ___________ structures
a tetrahedral
b hexagonal
c cubic
d octagonal

Question 15: Salt like hydrides have ___________ melting and boiling points.
a high
b low
c medium

MCQs On Periodic Classification OF Elements

Periodic Classification OF Elements

Prepared By: Saif-ur-Rehman Chachar

Question 1:   The properties of an element in the periodic table depends on its, ________.
1. atomic size
2. atomic mass
3. electronic configuration
4. number of protons

Question 2:   An element has configuration 2, 8, 1. It belongs to, _________.
1. 1 group and 3rd period
2. 3 group and 1st period
3. 1 group and 8th period
4. 17 group and 3rd period

Question 3:   The number of electrons in the valence shell is equal to its ________.
1. atomic mass
2. group number
3. period number
4. atomic volume

Question 4:   The non-metallic element present in the third period other than sulphur and chlorine is _______.
1. oxygen
2. fluorine
3. nitrogen
4. phosphorus

Question 5:   At the end of each period the valence shell is __________.
1. incomplete
2. half filled
3. singly occupied
4. completely filled

Question 6:   The family of elements having seven electrons in the outermost shell is ______.
1. alkali metals
2. alkaline earth metals
3. halogens
4. noble gases

Question 7:   Which of the following factors does not affect the metallic character of an element?
1. Atomic size
2. Ionisation potential
3. Electronegativity
4. Atomic radius

Question 8:   The family of elements to which potassium belongs is _________.
1. alkali metals
2. alkaline earth metals
3. halogens
4. noble gases

Question 9:   The modern periodic table is given by ________
1. Mendeleev
2. Einstein
3. Bohr
4. Mosley

Question 10:   Elements belonging to groups 1 to 17 are called __________.
1. noble gases
2. normal elements
3. transition elements
4. inner transition elements

Question 11:   A liquid non-metal is ___________.
1. phosphorous
2. mercury
3. bromine
4. nitrogen

Question 12:   The first alkali metal is _________.
1. hydrogen
2. lithium
3. sodium
4. francium

Question 13:   A purple coloured solid halogen is ________.
1. chlorine
2. bromine
3. iodine
4. astatine

Question 14:   Lanthanides and actinides are also called ___________.
1. normal elements
2. transition elements
3. noble gases
4. inner transition elements

Question 15:   The family of elements to which calcium belongs is __________.
1. alkali metals
2. alkaline earth metals
3. halogens
4. noble gases

Entry Test MCQs OF Chemistry

Q. 1.    The soul of chemistry is its dealing with
a.            Internal structural changes in matter
b.            Composition of matter
c.            Properties of matter
d.            Composition and properties of matter

Q. 2.    All of the following statements are incorrect for 20 mol of hydrogen peroxide except
a.            it has 20 mol of hydrogen atoms
b.            it has 30 mol of oxygen atoms
c.            it has 80 mol of atoms
d.            30 mol of hydrogen atoms

Q. 3.    If proton number of two atoms is same then it can be concluded that
a.            they are isotopes
b.            compounds of both with CI₂ will be similar in reactivity towards other compounds
c.            both have same colors
d.            both have same melting point
Q. 4.    A chemist poured lemon juice on soil, the idea that he may have in his mind is that
a.            there may be a possibility of a chemical reaction
b.            lemon juice is dangerous to health
c.            lemon juice is dangerous to health
d.            water should be preferred over lemon juice for drinking
Q. 5.    Dr. Khan has discovered two isotopes of an element with atomic number 119. The relative abundance of isotopes ₁₁₉Uue³⁰⁰ and ₁₁₉Uue³⁰⁵ is 70% and 30% respectively. The average atomic weight of Uue is
a.            301.5 a.m.u
b.            302.5 a.m.u
c.            303.5 a.m.u
d.            304.5 a.m.u  Q. 6.    Which of the following is not related to a.m.u
a.            gram
b.            kilogram
c.            microgram
d.            gram/lit

Q. 7.    The number of significant figures in 0.00200 is
a.            two
b.            three
c.            five
d.            one

Q. 8.    All of the following statements are incorrect except
a.            precision and accuracy should go side by side in a scientific work
b.            scientific work must be precise, accuracy is not essential
c.            scientific work must be accurate, precision is not essential
d.            +calculations must be made before any experiment

Q. 9.    Empirical formula and formula unit of an ionic compound
a.            are always similar
b.            are always different
c.            may be similar or different
d.            ionic compounds don’t’ have any empirical formula
Q. 10.  Copper (II) oxide is mixed with organic compound during combustion analysis. The purpose is
a.            to carry out complete combustion
b.            to reduce the economy of the process
c.            to reduce the time for completion of the reaction
d.            all of the above

Q. 11.  Bismark brown is a dye. Its molar mass is 228.3 g/mol. When the dye was analyzed by a scientist, it was found that it contains 30.68% nitrogen. How many nitrogen atoms are there in each Bismark brown molecule?
a.            6
b.            5
c.            4
d.            3

Q.12.   The mass of 2 mole of sodium hydroxide will be
a.            2 g
b.            20 g
c.            40 g
d.            80 g

Q. 13.  “A” compound is always consists of the same elements combined in the same fixed ratio”. The statement is
a.            a hypothesis
b.            a fact
c.            a law
d.            an observation


Q. 14.  Compound having highest boiling point among the following is
a.            HF_(I)b.            HCI_(I)c.            HBR_(I)d.            HI_(I)

Q. 15.  Islamian genius investigated that the amount of heat required to raise the temperature of 11 gram of water form 30^oC to 31^oC is
a.            one calorie
b.            little bit greater than on calorie
c.            little bit less than one calorie
d.            never equal to one calorie

Q. 16.  An atom is
a.            smallest indivisible particle in an element
b.            smallest particle of an element which can undergo a chemical reaction
c.            building block of an element
d.            always smaller than molecule
Q. 17.  10 moles of H₂O contains
a.            100 moles of bonds
b.            100 moles of electrons
c.            30 atoms
d.            25 moles of hydrogen bonds        

Q. 18.  The volume of one kilogram of water at 4^oC is equal to one litre. The temperature of water is kept at 4^oC because water
a.             has no dissolved gasses at this temperature
b.             has maximum density at this temperature
c.              polarity of water molecule is least at this temperature
d.             dipole moment has maximum value at this temperature
Q. 19.  A compound contains two elements X and Y percentage of X is 20% (At.wt = 40) and that of Y is 80% (At.wt =80). The empirical formula of the compound is
a.            XY₂b.            X₂Y
c.            X₃Y
d.            XY

Q. 20.  A piece of paper is burnt in air, the gas produced is passed through distilled water. The PH of water solution will be
a.            1
b.            7
c.            2.1
d.            6.8
Q. 21.  Which of the following is a substance?
a.            sea water
b.            brass
c.            tape water
d.            graphite

Q. 22.  Freezing point of a substance is a temperature at which a liquid substance is converted to solid, it is
a.            always lower than its melting point
b.            usually a little lower than its melting point
c.            always higher than its melting point
d.            exactly the same as its melting point
Q. 23.  Number of covalent bonds in 10 mol of carbon tetrachloride is
a.            2.4 x 10²⁵b.            40
c.            4 x 10²⁴d.            6.4 x 10²¹

Q. 24.  A student subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that the result was wrong. What is the correct result?           a.            10.234017
b.            10.2340178
c.            10.234
d.            10.23
Q. 25.  The following statement contained in a student’s laboratory report is a conclusion.           a.            a gas is liberated
b.            colour of the gas is greenish yellow
c.            oxide of the gas is strongly acidic
d.            the gas is chlorine
Q. 26.  If 10g each of  uranium and hydrogen are converted into energy according to equation E = mc²           a.            energy obtained from uranium will be too much greater than that of hydrogen
b.            energy obtained from hydrogen will be a little bit less than that of uranium
c.            energy obtained from hydrogen and uranium will always be exactly equal
d.            diamond
Q. 27.  A student analyzed a sample of sea water and found that it contained 2.3g of NaCi, 0. 005g of MgSo₄, 0.234g of CaCI₂ and 60.12g of H₂O. Total mass of the sample is
a.            62.659
b.            62.65
c.            62.70
d.            65.7
 Q. 28.  A 50.00 mL sample of a cough mixture prepared by a pharmacist was found to have a mass of 46.0g. what is the density (in g/mL) of this mixture. Stated to the correct number of significant figures?
a.            0.92
b.            0.920
c.            0.9200
d.            1.087

Q. 29.  Ozone (O₃) filters the cosmic rays of sunlight. How many oxygen atoms are there in 0.2 mole of ozone (O₃, molar mass 48.0 g/mol)?
a.            6.02 x 10²²b.            6.02 x 10²³c.            3.61 x 10²³d.            6 x 10²³

Q. 30.  On heating, the hydrated salt CaSO₄, xH₂O loses its water of crystallization. In an experiment it was found that when 0.2 mol of the hydrated salt was heated 0.10 mol of water was lost. What is the molecular formula of the hydrated compound?
a.            CaSO₄b.            CaSO₃. ½ H₂O
c.            CaSO₄.H₂O
d.            CaSO₄.2H₂O

MCQs OF Chemistry Reaction Kinetics

Chemistry Reaction Kinetics :

1- According to HESSES law,therml effects of a reaction depends upon?

a-initial concentration of reactants
b-initial and final concentrations of reacting substances
c-final conditions of the reacting substances
d-catalyst

2-when ammonium chloride is dissolved in water,the solution becomes cold.the change is?
a-endothermic
b-exothermic

c-super cooling
d-chemical

3-how much heat is liberated when 100ml of 0.1M NaOH are completely neutralized by 100ml of 0.1 MHCl?
a--57kj
c- -5.7kj
d- -6.05kj

4-BORN HEBER cycle is called
a-complete enthalphy cycle
b-complete energy cycle
c-complete internal energy cycle
d-complete heat cycle

5-the atom X nd Y have the electronic configuration shown below
X. 1s2  2s2  2p6 3s2 3p6 3d10 4s2
Y.1s2 2s2 2p4
which of  the following components are they likely to form
a-XY
b-XY2
c-X2Y
d-XY4

6-which of the following moleculeshas zero dipole moment
a-NH3
B- CHCL3
C-H2O

D-BF3
7-ehich of the hydrogen halides has the highest percentage of ionic character
a-HCl
b-HBr
c-HF
d-HI

8-which of the following species has unpaires electrons in antibonding molecular orbital
a-O2-2
b- N2-2
c-B2
d- F2
9-the molecule with largest dipole moment
a-BCl3
b- CO2
c-CO
d-CH4

10-during formation of ionic bond between sodium and chlorine
A- Na attains yhe configuration of Ne
B- Na attains the configuration of Ar
C-Cl attains the configuration of Ne
D- Cl attains the configuration of Na

11-the degree of polarity of molecule is called
A-bond energy
B-dipole moment
C-ionic character
D-coordinate character

12-VESPER theory explains
A- geometrical shape of molecules
B-sharing of electrons
C-ionic charater
D-paramagnetic nature of substance

13-which theory explains that pair of electrons around the central atom lie at maximum distance so they experience minimum repulsion
A- V.B theory
B- VESPER theory
C- MO theory
D- kinetic mooleculr theory

14- in sp2 hybridises orbital the s character is
A-11 PERCENT
B-22 PERCENT
C-33 PERCENT
D-44 PERCENT

15-which one has expected to have highest bond energy
A-CH4
B-HCl
C-HF
D-all
16- in a sigma bond formed between two hydrogen atoms, the electron cloud will be dense
a-on the sides of nuclei
b-below the bonded nuclei
c-in between to bonded nuclei
d-above the bonded nuclei
17-chemical bond formation takes place when
a-energy is absorbed
b-force of  attraction is equal to force of repulsion
c-force of repulsion overcomes the force of attraction
d-force of attraction overcomes force of repulsion

18-which change would have  negative DELTA H value
a- Nas------->Nag
b-Clg + e------->Cl-
c-Nag----------> Na+ +e
d-none

19- DELTA H and DELTA E are same when the system under study is
a-gas
b-solid
c-liquid
d- both solid and liquid
20- if you have two different polar diatomic molecules,their dipole moment will be
a-equal
b-different
c-zero
d-less than zero

21-which has two pi bonds
a-ethane
b-ethene
c-ethyne
d-ether

22-which of the following has the covalent bond
a-HCl
b-CaCl2
c-AlCl3
d-NaH

23-structure of ammonia molecule is
a- pyramidal
b-linear
c-angular
d-planar

24-chlorine atom gains the electrons in its valence shell because of its high
a-E.A values
b-I.E values
c-E.N values
d-noe of the above

25-dipole moments are measured in
a-coloumb metere
b- Nm
c-Jm
d-J

26-Which of the following has the greater bond distance
a-HF
b-HBr
c-HCl
d-HI

27-an atom of an element consist of 5 protons, neutrons,2k electrons and 3 L Electrons.the mass num of this atom is
a-13
b-9
c-8
d-5

28-the num of orbitals t\in d subshell is
a-1
b-3
c-4
d-5

29- valence bond theory is unable to explain
a-paramagnetism of O2 moecule
b-shape ofO2 molecule
c-stability ofN2 molecule
d-double and triple bond