Chapter-Wise Solved Objective Questions

Prepare 12th Class Chemistry MCQs with answers. Chapter-wise solved objective questions for FSc Part 2 Chemistry based on Punjab Textbook Board syllabus.

▶ Chapter 1 - Periodic Classification of Elements and Periodicity

Q1: Keeping in view the size of atoms, which order is the correct one:

Mg > Sr Lu > Ce Ba > Mg Cl > 1

Q2:Mark the correct statement:

Na⁺ is smaller than Cl atom Na⁺ is larger than Na atom Cl^- is smaller than Cl atom Cl^- (ion) and Cl (atom) are equal in size

Q3:Mark the correct statement:

All lanthanides are present in the same group All halogens are present in the same period All the alkali metals are present in the same group All the noble gases are present in the same period

Q4:Which statement is incorrect:

All the metals are good conductor of electricity All the metals are good conductor of heat All the metals form positive ions All the metals form acidic oxides

Q5:Which statement is correct:

Hydrogen resembles in properties with IA, IVA and VIIA elements Hydrogen resembles in properties with IIIA, IVA and VA elements Hydrogen resembles in properties with IIA, IVA and VIA elements Hydrogen resembles in properties with IIA, IIIA and VIIA elements

Q6: Mark the correct statement:

The ionization energy of calcium is lower than that of barium The ionization energy of calcium is lower than that of magnesium The ionization energy of calcium is higher than that of beryllium The ionization energy of calcium is lower than that of strontium

Q7: Mark the correct statement:

Electron affinity is a measure of energy required to remove the electron Electron affinity is a measure of energy released by adding an electron Electron affinity is a measure of energy required to excite an electron Electron affinity is a measure of energy released by removing an electron

Q8:Mark the correct statement:

Metallic character increases down the group Metallic character increases from left to right along a period Metallic character remains the same from left to right along a period Metallic character remains the same down the group

Q9: Mark the correct statement:

Melting points of halogens decrease down the group Melting points of halogens increase down the group Melting points of halogens remain the same throughout the group Melting points of halogens first increase and then decrease down the group

Q10:Mark the correct statement:

Covalent character of metal halides increases from left to right in a period Boiling points of Group IVA hydrides decrease down the group Ionic character of hydrides increases from left to right in a period The basicity of group IIA oxides decreases on descending the group

Q11:In the Mendeleev's periodic law the properties of elements are periodic function of their:

Volume Densities Atomic number Atomic masses

Q12:How many elements are present in 5th period of the periodic table.

32 8 18 28

Q13:The basis of Modern Periodic Law is:

Electron affinity Atomic mass Ionization enregy Atomic number

Q14: The oxides of non-metals are:

Acidic Amphoteric Basic Neutral

Q15: The number of gorups present in modern periodic table are:

8 7 6 5

Q16:In periodic table all the non-metals are placed under which of the blocks?

f d p s

Q17: Smaller the size of an ion:

Lesser is the degree of hydration Lesser is the polarizing power Greater is the electron affinity Greater is the degree of hydration

Q18: Which one is ionic hydride?

NaH AIH NH₃ CH₄

Q19:Hydrogen resembles in properties with groups:

I-A, V-A, VII-A elements I-A, IV-A, VII-A elements II-A, III-A, V-A elements I-A, II-A, elements

Q20: Which one is an incomplete period?

4th 5th 6th 7th

Q21: Which one of the following has highest hydration energy?

Na⁺ Ca⁺⁺ Mg⁺⁺ LI⁺

Q22:The hydrides of group I -A are:

Ionic Covalent Metallic Interstitial

Q23: The radius of Flourine F^- is:

72pm 136pm 99pm 181pm

Q24:6^th period contains the number of elements:

18 32 8 10

Q25:Which is the longest period of periodic table?

4 5 6 7

Q26:The word alkali is derived from which language?

Arabic Greek French German

Q27:Which of the following is non metal?

B Al Ga In

Q28: Each carbon atom is sp³ hybridized in the class of:

Alkenes Alkynes Ketones Alkanes

Q29: Zinc oxide is an example of:

Acidic oxide Basic oxide Amphoteric oxide Neutral

Q30: Which one is the basic oxide?

BeO Na₂O SO₂ NO₂

▶ Chapter 2 - s-Block Elements

1. Which one of the following does not belong to alkaline-earth metals:

Be Ra Ba Rn

2.Which ion will have the following is not an alkali metal?

Na⁺ CS²⁺ Ba²⁺ Mg²⁺

3. The oxides of beryllium are:

Acidic Basic Amphoteric None of these

4. Which one of the following is not an alkali metal?

Franciumt Cesium Rubidium Radium

5.Which of the following sulphates is not soluble in water?

Sodium sulphate Zinc sulphate Potassium sulphate Barium sulphate

6. The element caesium bears resemblance with:

Ca Cr Both of these metals None of these metals

7.Chile saltpetre has the chemical formula:

NaNO₃ KNO₂ Na₂B₄O₇ Na₂CO₃.H₂O

8. The mineral CaSO₄.2H₂O has the general name:

Gypsum Dolomite Calcite Epsom salt

9. Down's cell is used to prepare:

Sodium carbonate Sodium metal Sodium bicarbonate Sodium hydroxide

10.Which element is deposited at the cathode during the electrolysis of brine in diaphragm cell?

H₂ Na Cl₂ O₂

11.LiNO₃decompose to give products:

Li₂O+NO₂+O₂ Li₂O+NO+₂ Li₂O+NO Li₂O₂+NO+O₂

12. Elements of group IIA are called:

Alkali metals Alkaline earth metals Coinage metals Halogens

13.Which of the following element has lowest ionization energy:

Beryllium Boron Carbon Oxygen

14.Which element has lowest melting point:

Beryllium Magnesium Calcium Barium

15. Which is the least reactive of all the alkali metals:

Li Na K Cs

16. Elements of group-I A are called:

Alkali metals Halogens Alkaline-earth metals Inert gases

17.Which one does not belong to the alkaline-earth metals?

Be Ba Ra Rn

18. Nelson's cell is used to prepare:

NaOH Na₂CO₃ Na metal NaCl

19. Which one of halogens is a liquid?

F₂ Cl₂ Br₂ I₂

▶ Chapter 3 - Group IIIA and Group IVA Elements

1. Which metal is used in the thermite process because of its activity:

Iron Aluminium Copper Zinc

2. Aluminium oxide is:

Acidic oxide Basic oxide Amphoteric oxide None of these

3. Chemical composition of colemanite is:

Ca₂B₆O₁₁.5H₂O CaB₄O₇.4H₂O Na₂B₄O₇.4H₂O CaNaB₅O₉.8H₂O

4. Which element forms an ion with charge +3:

Beryllium Aluminium Carbon Silicon

5. Which electronic configuration corresponds to an element of Group-IIIA of the periodic table:

1s²,2s²,2p⁶,3p¹ 1s²,2s²,2p⁶,3p⁶,4s² 1s²,2s²,2p⁶ 1s²,2s²,2p⁶,3s²,3p³

6. Which element among the following belongs to Group IVA of the periodic table: OR Which element belongs to group IV A of thepenodic table:

Barium lodine Lead Oxygen

7. Boric acid cannot be used:

As antiseptic in medicine For washing eyes In soda bottles For enamels and glazes

8. Which of the following elements is not present abundantly in earth's crust?

Silicon Aluminium Sodium Oxygen

9.Tincal is a mineral of:

Al Bv Si C

10. The chief ore of aluminium is:

Na₃AlF₆ Al₂O₃.2H₂O Al₂O₃ Al₂O₃.H₂O

11. Boric acid reacts with caustic soda to produce:

NaBO₂ NaH₂BO₃ Na₂B₄O₇ Na₃BO₃

12. Plaster of Pairs can be obtained from:

Marble Bauxite Gypsum Limestone

13. Which metal is used in the flash light photography becaus its activity?

Iron Copper Aluminium Zinc

14. In Borax Bead Test, colour of Cupric borates are:

Red Blue Green Colourless

15. Kaolin is a mineral of:

Carbon Magnesium Silicon Aluminium

16. Which of the following has highest melting point?

Aluminium Silicon Phosphorous Sulphur

17. Which is used in the leather industry?

Borax Boric acid Boric oxide Tetra Boric acid

18. A gas which burns with blue flame is:

CO₂ NO CO N₂

19. Which oxide is amphoteric in nature?

Al₂O₃ Cl₂O₇ MgO SO₃

20. The queous solution of borax is:

Acidic Alkaline Amphoteric Neutral

▶ Chapter 4 - Group VA and Group VIA Elements

1. Out of all the elements of group VA, the highest ionization energy is possessed by:

(a) N (b) P (c) Sb (d) Bi

2. Among group VA elements, the most electronegative element:

(a) Sb (b) N (c) P (d) As

3.Oxidation of NO in air produce:

(a)N₂O (b)N₂O₃ (c)N₂O₄ (d)N₂O₅

4.The brown gas formed, when metal reduces HNO₃ to: />

(a)N₂O₅ (b)N₂O (c)NO₂ (d)NO

5.Laughing gas is chemically:

(a)NO (b)N₂O (c)NO₂ (d)N₂O₄

6.Out of all the elements of group VIA, the highest melting and boiling points is shown by the element.

(a)Te (b)Se (c)S (d)Pb

7.SO₃ is not absorbed in water directly to form H₂SO₄beause:

(a)The reaction does not go to completion (b)The reaction is quite slow (c)The reaction is highly exothermic (d)SO₃is insoluble in water

8.Which catalyst is used in contact process?

(a)Fe₂O₃ (b)V_2O₅ (c)SO₃ (d)Ag_2O

9.Which the following specie has the maximum number of unpaired electrons?

(a)O₂ (b)O⁺₂ (c)O^-₂ (d)O^2-₂

10.Gold dissolves in aqua regia to form:

(a)AuCl₃ (b)AuI₃ (c)AuI₂ (d)Au₂(SO₄)₃

11.During ultration of benezene, the active nitrating agent is:

(a)N⁺O₂ (b)N^-O₃ (c)NO₂ (d)HNO₃

12.Which metal is rendered passive by HNO, due to formation of a film of metal oxide over the metal.

(a)Pt (b)Sn (c)Co (d)Mn