Class 12 Chemistry Chapter 7 p Block Elements Very Short Questions with Answers | Class 12 Chemistry Chapter 7 p Block Elements Quiz

(1) Ammonia gas can be collected by the displacemet of

[A] Conc. H₂SO₄

[B] Brine

[C] Water

[D] Mercury

Answer: Mercury

(2) The chemical used for cooling in refrigeration is

[A] CO₂

[B] NH₄OH

[C] NH₄Cl

[D] Liquid NH₃

Answer: Liquid NH₃

(3) Reaction of PCl₃ and PhMgBr. Would give

[A] Bromobanzene

[B] Chlorobenzene

[C] Triphenyl phosphine

[D] Dichlorobenzene

Answer: Triphenyl phosphine

(4) Which of the following P is most stable

[A] Red

[B] White

[C] Black

[D] All stable

Answer: Red

(5) The least stable hydride of 75th group elements in

[A] NH₃

[B] PH₃

[C] AsH₃

[D] BiH₃

Answer: BiH₃

(6) The chemical formula of Tear gas is

[A] COCl₂

[B] CO₂

[C] Cl₂

[D] CCl₃NO₂

Answer: CCl₃NO₂

(7) PH4I + NaOH forms

[A] PH₃

[B] NH₃

[C] P₄O₆

[D] P₄O₁₀

Answer: PH₃

(8) Which is not an acid salt

[A] NaH₂PO₃

[B] NaH₂PO₂

[C] Na₃HP₂O₆

[D] Na₄P₂O₇

Answer: Na₄P₂O₇

(9) The number of hydroxyl group in pyrophosphoric acid is

[A] 3

[B] 4

[C] 5

[D] 6

Answer: 4

(10) Which of the following has the highest proton affinity

[A] Stilbine

[B] Arsine

[C] Phosphine

[D] Ammonia

Answer: Ammonia

(11) Which of the following has highest B.P

[A] NH₃

[B] PH₃

[C] AsH₃

[D] SbH₃

Answer: SbH₃

(12) Which of the following exihibits highest solubility in H₂O

[A] NH₃

[B] PH₃

[C] AsH₃

[D] SbH₃

Answer: NH₃

(13) HNO₃ in aqueous solution yields

[A] NO₃- and H+

[B] NO₃- and H₃O+

[C] NO₂- and OH-

[D] N₂O₅ and H₂O

Answer: NO₃- and H₃O+

(14) The three important oxidation state of P are

[A] -3, +3, +5

[B] -3, +3, -5

[C] -3, +4, -4

[D] -3,+3,+4

Answer: -3, +3, +5

(15) Which show maximum valency

[A] P

[B] Tin

[C] Sb

[D] Bi

Answer: P

(16) Which oxide of N is obtained on heating ammonium nitrate at 250°C

[A] Nitric oxide

[B] Nitrous oxide

[C] Nitrogen dioxide

[D] Dinitrogen oxide

Answer: Nitrous oxide

(17) The number of P-O-P bonds in cyclic metaphos phoric acid is

[A] 0

[B] 2

[C] 3

[D] 4

Answer: 3

(18) The product oblained by heating (NH₄)₂SO₄ and KCNO is

[A] Hydrocyanic acid

[B] Ammonia

[C] Ammonium cyanide

[D] Urea

Answer: Urea

(19) Which compound is related to haber’s process

[A] CO₂

[B] H₂

[C] NO₂

[D] NH₃

Answer: NH₃

(20) The carbonate which does not leave a residue on heating is

[A] Na₂CO₃

[B] PH₃

[C] SbH₃

[D] AsH₃

Answer: Bi₂O₂

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