Here we are going to provide class 12 chemistry chapter 12 P-Block Element solved MCQs that help Sindh board students in their exam.
12 Class Chemistry Chapter 12 MCQs with Answers
This 2nd year’s chemistry chapter 12 Sindh board MCQs are also helpful for Karachi, Hyderabad, Larkana, and Sukkur board students in their examination preparation.
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1. Basicity of boric acid, H3BO3 is:
a) 2
b) 3
c) 4
d) 5
Answer: a) 2
2. When boric acid H3BO3 is heated, the residue left is:
a) Metaboric acid
b) Boric anhydride
c) Boron
d) Borax
Answer: b) Boric anhydride
3. Graphite is an inert electrode. When the electrolysis of aqueous solution of NaCl is carried out by using graphite electrode, then the substance collected at the cathode is:
a) Hydrogen gas
b) Sodium metal
c) Sodium hydroxide
d) Chlorine gas
Answer: a) Hydrogen gas
4. Which of the following elements has lowest ionization energy
a) Beryllium
b) Boron
c) Carbon
d) Oxygen
Answer: b) Boron
5. Which order is the correct one for the size of atoms
a) Mg>Sr
b) Ba>Mg
c) Lu>Ce
d) Cl>1
Answer: b) Ba>Mg
6. Which element has lowest melting point
a) Beryllium
b) Magnesium
c) Calcium
d) Barium
Answer: b) Magnesium
7. The element of 2nd period, which has ionization energy from the following is:
a) Be
b) C
c) N
d) O
Answer: c) N
8. Which one is not a periodic property:
a) Ionization energy
b) Density
c) Atomic Radii
d) Hydration energy
Answer: b) Density
9. __________ is very reactive, poisonous and waxy soft solid.
a) red phosphorus
b) white phosphorous
c) green phosphorous
d) blue phosphorous
Answer: b) white phosphorous
10. The existence of an element in more than one form in a same physical state is called ____
a) amorphous
b) allotropy
c) crystalline solids
d) none of the above
Answer: b) allotropy
11. Transition temperature of Sulphur is _______.
a) 46 oC
b) 6 oC
c) 96 oC
d) 86 oC
Answer: c) 96 oC
12. Sn grey exists in _____ shape.
a) tetragonal
b) cubic
c) hexagonal
d) none of the above
Answer: b) cubic
13. The arrangement of atoms in allotropic form changes with change in _______.
a) pressure
b) volume
c) density
d) temperature
Answer: d) temperature
14. Which catalyst is used in the contact process
a) Fe2O3
b) V2O5
c) SO3
d) Ag2O
Answer: b) V2O5
15. Which compound gives carbon when heated with con H2SO4
a) Starch
b) Ethyl alcohol
c) Oxalic acid
d) Formic acid
Answer: a) Starch
16. SO3 is not absorbed in water directly to form H2SO4 because:
a) The reaction does not go to completion
b) The reaction is quite slow
c) The reaction is exothermic
d) SO3 is insoluble in water
Answer: c) The reaction is exothermic
17. The incorrect statement about H2SO4 is:
a) Sulphonating agent
b) Highly viscous
c) Reducing agent
d) Hydrating
Answer: c) Reducing agent
18. H2SO4 has great affinity for water because:
a) It decomposes the acid
b) It hydrolyses the acid
c) Acid decomposes water
d) Acid forms hydrate with water
Answer: d) Acid forms hydrate with water
Conclusion
The topic of this post is class 12 chemistry chapter 12 mcqs with solved answers for board exam preparation. Also, we added this post to the 12th class category.