CBSE Class 12 Chemistry The p Block Elements Worksheet Set B

Question. When PbO₂ reacts with conc. HNO₃ the gas evolved is
(a) NO₂
(b) O₂
(c) N₂
(d) N₂O
Answer : B

Question. In the reaction HNO₃ + HF → H₂⁺NO₃ + F base is
(a) HF
(b) HNO₃
(c) HF and HNO₃
(d) None of these
Answer : B

Question. Ammonia is generally manufactured for fertilizers by the reaction
(a) 2NH₄Cl +Ca(OH)₂ → CaCl₂ + 2H₂O +2NH₃
(b) By passing an electric discharge in a mixture of N₂ and H₂
(c) By passing a mixture of N₂ and H₂ under high pressure and moderate temperature over a catalyst
(d) None of these
Answer : C

Question. Boiling / melting points of the following hydrides follow in order
(a) SbH₃ > AsH₃ > PH₃ < NH₃
(b) SbH₃ > AsH₃ > PH₃ > NH₃
(c) SbH₃ > AsH₃ < PH₃ < NH₃
(d) SbH₃ < AsH₃ < PH₃ < NH₃
Answer : A

Question. Which one of the following is correct pair with respect to molecular formula of Xenon compound and hybridization state of Xenon in it?
(a) XeF₄, sp³
(b) XeF₂, sp
(c) XeF₂, sp³d
(d) XeF₄, sp²
Answer : C

Question. When potassium ferrocyanide crystals are heated with conc. H2SO4, the gas evolved is
(a) SO₂
(b) NH₃
(c) CO₂
(d) CO
Answer : D

Question. NH₄ClO₄ +HNO₃(dil) →HClO₄ +[X]

[X] and [Y] are respectively –
(a) NH₄NO₃ & N₂O
(b) NH₄NO₂ & N₂
(c) HNO₄ & O₂
(d) None of these
Answer : A

Question. In the reaction 4HNO₃ + P4O₁₀ → 4HPO₃ +X, the product X is
(a) N₂O₅
(b) N₂O₃
(c) NO₂
(d) H₂O
Answer : A

Question. Hydrolysis of one mole of peroxodisulphuric acid produce
(a) two moles of sulphuric acid
(b) two moles of peroxomonosulphuric acid
(c) one mole of sulphuric acid and one mole of peroxomonosulphuric acid
(d) one mole of sulphuric acid, one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide.
Answer : C

Question. HBr and HI reduce sulphuric acid, HCl can reduce KMnO₄ and HF reduces
(a) H₂SO₄
(b) KMnO₄
(c) K₂Cr₂O₇
(d) None of these
Answer : D

Question. When Br₂ is treated with aqueous solutions of NaF, NaCl and NaI separately
(a) F₂, Cl₂ and I₂ are liberated
(b) only F₂ and Cl₂ are liberated
(c) only I₂ is liberated
(d) only Cl₂ is liberated
Answer : C

Question. The ease of liquefaction of noble gases increases in the order
(a) He < Ne < Ar < Kr < Xe
(b) Xe < Kr < Ne < Ar < He
(c) Kr < Xe < He < Ne < Ar
(d) Ar < Kr < Xe < Ne < He
Answer : A

Question. Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?
(a) XeO₂F₂
(b) XeOF₄
(c) XeO₃
(d) XeO₄
Answer : D

Question. [X]+ H₂SO₄ → [Y], a colourless gas with irritating smell [Y]+ K₂Cr₂O₇ + H₂SO₄ → Green solution The species [X] and [Y] are –
(a) SO₃^2–, SO₂
(b) Cl^–, HCl
(c) S^2–, H₂S
(d) CO₃^2–, CO₂
Answer : A

Question. What are the products formed in the reaction or xenon hexafluoride with silicon dioxide ?
(a) XeSiO₄ + HF
(b) XeF₂ + SiF₄
(c) XeOF₄ + SiF₄
(d) XeO₃ + SiF₂
Answer : C

Numeric Value Answer

Question. The number of Cl = O bonds in perchloric acid is, "______."
Answer : 3

Question. How many bonding electron pairs are there in white phosphorus?
Answer : 6

Question. The number of S–S bonds in sulphur trioxide trimer (S₃O₉) is _________
Answer : 0

Question. The number of P–O–P bonds in P4O10 is _______
Answer : 6

Question. The number of P–O–P bonds in cyclic metaphosphoric acid is _________
Answer : 3

CBSE Class 12 Chemistry The p Block Elements Worksheet Set B

              Very Short Answer

Q1)       How polonium occurs?

Q2)       Define amphoteric oxides?

Q3)       What is Holme’s signal?

Q4)       Why does PCl₃ fume in moisture?

Q5)       What is neutral oxide?

              Short Answer

Q6)       What are the properties of the dioxygen?

Q7)       What is group 16 called?

Q8)       What are the three steps involve in the manufacturing of the sulphuric acid by the Contact process?

Q9)       What are the uses of the sulphuric acid?

Q10)     What do you mean by the oxoacids of sulphur?

              Long Answer

Q11)     Explain the preparation and properties of the ozone?

Q12)     Explain the physical properties of group 16 elements?

Q13)     State the difference between rhombic sulphur and monoclinic sulphur?

Q14)     Explain the anomalous behavior of the oxygen?

Q15)     Difference between chemical and physical properties?