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

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Free download in PDF Short 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) Bleaching action of bleaching powder is due to liberation of
[A] Chlorine
[B] Molecular oxygen
[C] Nascent oxygen
[D] Calcium carbonate
Answer: Nascent oxygen
(2) What products are expected from disproportion reaction of hypochlorous acid.
[A] HClO3 & Cl2O
[B] HClO2 & HClO4
[C] HCl & Cl2O
[D] HCl & HClO3
Answer: HCl & HClO3
(3) Mixture of conc. HCl & HNO3 made in 3:1 ratio contains
[A] ClO2
[B] NOCl
[C] NCl3
[D] N2O4
Answer: NOCl
(4) I–|3| is used for treatment of
[A] Thyroid disorders
[B] Skin disorders
[C] Brain tumours
[D] Kidney stones
Answer: Thyroid disorders
(5) Least reactive halogen with hydrogen is
[A] Cl
[B] I
[C] Br
[D] F
Answer: I
(6) Bleaching action of chlorine is due to
[A] Oxidation
[B] Reduction
[C] Hydrolysis
[D] Its acidic nature
Answer: Oxidation
(7) Which among following non metals is liq at 25°C
[A] Br
[B] C
[C] P
[D] S
Answer: Br
(8) Element that librates oxygen gas from water is
[A] P
[B] Na
[C] F
[D] I
Answer: F
(9) On exciting Cl2 molecule by UV Light , we get
[A] Cl
[B] Cl+
[C] Cl–
[D] All
Answer: Cl
(10) Which of following sequence is correct with refrence to oxidation number of iodine
[A] I2 < ICl < HI < HIO4
[B] HIO4 < ICl <  I2 < HI
[C]   I2 < HI < ICl < HIO4
[D] HI <  I2 < IC < HIO4
Answer: HI <  I2 < IC < HIO4
(11) What is obtained on reacting HgCl2 & Hg(CN)2
[A] (CN)2
[B] addition compound HgCl2. Hg(CN)2
[C] Hg(CN) Cl
[D] Hg [Hg(CN)2Cl2]
Answer: addition compound HgCl2. Hg(CN)2
(12) Chlorine is liberated when we heat
[A] KMnO4 + NaCl
[B] K2 Cr2O7 + MnO2
[C] Pb2 (NO3)4 + MnO2
[D] K2 Cr2O7 + HCl
Answer: K2 Cr2O7 + HCl
(13) Metal halide, insoluble in water is
[A] AgI
[B] KBr
[C] CaCl2
[D] AgF
Answer: AgI
(14) Which of following oxides is expected exhibit paramagnetic behaviour
[A] CO2
[B] SO2
[C] ClO2
[D] SiO2
Answer: ClO2
(15) Iodine dissolver readily in
[A] Water
[B] Potassium iodide
[C] CCl4
[D] Alcohol
Answer: CCl4
(16) Cl2 reacts with CS2 in presence of I2 to form
[A] CHCl3
[B] CCl4
[C] C2H5Cl
[D] C2H6
Answer: CCl4
(17) Bleaching powder is
[A] CaOCl2
[B] CaO
[C] CaO(Cl)
[D] CaCl(OCl)
Answer: CaCl(OCl)
(18) Bleaching powder is obtained by treating chlorine with
[A] CaO
[B] CaCO3
[C] CaSO4
[D] Ca(OH)2
Answer: Ca(OH)2
(19) Which is formed when F reacts with hot & conc. Sodium Hydroxide.
[A] O2
[B] O3
[C] NaO
[D] HF
Answer: O2
(20) Bromine water reacts with SO2 to form
[A] H2O & HBr
[B] H2SO4 & HBr
[C] HBr & S
[D] S & H2O
Answer: H2SO4 & HBr

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