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Class 12 Chemistry Chapter 7 p Block Elements MCQs | GK Type Questions and Answers on Class 12 Chemistry Chapter 7 p Block Elements

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Free download in PDF GK Type Questions and Answers on Class 12 Chemistry Chapter 7 p Block Elements for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Aquaregia is
[A] 1:3 conc. HNO3 and conc. HCl
[B] 1:2 conc. HNO3 and conc. HCl
[C] 3:1 conc. HNO3 and conc. HCl
[D] 2:1 conc. HNO3 and conc. HCl
Answer: 1:3 conc. HNO3 and conc. HCl
(2) Which of the following hydrides is least stable
[A] AsH3
[B] SbH3
[C] NH3
[D] PH3
Answer: SbH3
(3) The most stable hydride is
[A] NH3
[B] PH3
[C] AsH3
[D] SbH3
Answer: NH3
(4) Which has the lowest boiling point
[A] NH3
[B] PH3
[C] AsH3
[D] SbH3
Answer: PH3
(5) Which is the most explosive
[A] NCl3
[B] PCl3
[C] AsCl3
[D] All
Answer: NCl3
(6) The most acidic is
[A] AS2O3
[B] P2O3
[C] Sb2O3
[D] Bi2O3
Answer: P2O3
(7) Non-existing compound is
[A] PH4I
[B] As2O3
[C] SbCl2
[D] As2H3
Answer: SbCl2
(8) Pure N2 gas is obtained from
[A] NH3 + NaNO2
[B] NH4Cl + NaNO2
[C] N2O + Ca
[D] (NH4)2Cr2O7
Answer: NH4Cl + NaNO2
(9) Pure nitrogen can be prepared from
[A] NH4OH
[B] Ca3N2
[C] NH4NO2
[D] Ba(NO3)2
Answer: NH4NO2
(10) NO2 is released by heating
[A] Pb(NO3)2
[B] KNO3
[C] NaNO2
[D] NaNO3
Answer: Pb(NO3)2
(11) Which of the following is neutral
[A] N2O5
[B] N2O3
[C] N2O4
[D] N2O
Answer: N2O5
(12) Which of the following is acidic
[A] NH3
[B] N2H4
[C] N2H2
[D] N3H
Answer: N3H
(13) Laughing gas is prepared by heating
[A] NH4Cl
[B] (NH4)2SO4
[C] NH4Cl + NaNO3
[D] NH4NO3
Answer: NH4NO3
(14) P4O6 reacts with water to give
[A] H3PO3
[B] H4P2O7
[C] HPO3
[D] H3PO4
Answer: H3PO3
(15) Electrolysis temperature is maximum
[A] AsH3
[B] NH3
[C] PH3
[D] SbH3
Answer: NH3
(16) Which of the following is not hydrolysed
[A] AsCl3
[B] PF3
[C] SbCl3
[D] NF3
Answer: NF3
(17) On adding H2O to BiCl3 solution in HCl, the compound produced is
[A] Bi2O3
[B] Bi(OH)3
[C] BiOCl
[D] BiOCl2
Answer: BiOCl
(18) N, P , As, Sb , Bi elements belong to
[A] VA Group
[B] IV A Group
[C] VII A Group
[D] Hg(OH)2
Answer: VA Group
(19) Which of the following elements occur free in nature
[A] Nitrogen
[B] Phosphorus
[C] Arsenic
[D] Antimony
Answer: Nitrogen
(20) Which of the following elements of group VA does not show allotropy
[A] N
[B] Bi
[C] P
[D] As
Answer: Bi

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