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

(1) On heating NaCl + K₂ Cr₂O₇ + Conc. H₂SO₄, we get

[A] O₂

[B] Cl₂

[C] CrOCl₂

[D] CrO₂Cl₂

Answer: CrO₂Cl₂

(2) Amongst LiCl , RbCl , BeCl₂ & MgCl₂ , max. & min. ionic character will be shown by

[A] LiCl , MgCl₂

[B] RbCl , BeCl₂

[C] RbCl , MgCl₂

[D] MgCl₂,BeCl₂

Answer: RbCl , BeCl₂

(3) Which of following chloride is water insoluble

[A] HCl

[B] AgCl

[C] both 'a' & b

[D] None

Answer: AgCl

(4) The alkali metal halide are soluble in water but LiF is insoluble because

[A] It's Amphoteric

[B] Li -F is highly ionic

[C] It's Lattice energy is high

[D] Li+ ion is least hydrated

Answer: It's Lattice energy is high

(5) Which of following is present as an active ingredient in bleaching powder for bleaching action

[A] CaCl₂

[B] CaOCl₂

[C] Ca(OCl)₂

[D] CaO₂Cl

Answer: Ca(OCl)₂

(6) ClO₂ reacts with O₃ to give

[A] Cl₂O₄

[B] Cl₂O

[C] Cl₂O₆

[D] ClO₄

Answer: Cl₂O₆

(7) Bad conductor Of electricity is

[A] H₂F₂

[B] HCl

[C] HBr

[D] HI

Answer: H₂F₂

(8) When KBr is treated with concentrated H₂SO₄ redish brown gas evolved, gas is

[A] Mixture of Br & HBr

[B] Bromine & HNO₃

[C] Bromine

[D] None of these

Answer: Bromine

(9) Which of following outter electronic configuration represents Ar?

[A] ns²

[B] ns² np⁶

[C] ns² np⁵

[D] ns² np⁴

Answer: ns² np⁶

(10) Which mineral was used in isolation of radium?

[A] Lime stone

[B] Pitch blende

[C] Rectile

[D] Haematite

Answer: Pitch blende

(11) Molecules of noble gas do not posses vibrational energy bec. Noble gas is

[A] Monoatomic

[B] Chemically inert

[C] Complete filled shells

[D] Is diatomic

Answer: Monoatomic

(12) Argon was discovered by

[A] Rayleigh

[B] Frankland & Lockyer

[C] Jansen

[D] Ramsay

Answer: Ramsay

(13) The colour discharge tubes for advertisement mainly contain

[A] Argon

[B] Neon

[C] Helium

[D] Xenon

Answer: Helium

(14) Least chemical activity is shown by

[A] Nitrogen

[B] Argon

[C] Methane

[D] Xenon

Answer: Argon

(15) Noble gases do not react with other elements because

[A] They have completely paired up & stable e - configuration

[B] Their size is very small

[C] Are monoatomic

[D] None of these

Answer: They have completely paired up & stable e - configuration

(16) Monazite is source of

[A] He

[B] Kr

[C] Ar

[D] Ne

Answer: He

(17) He is added to oxygen supply used by deep sea divers because

[A] It's less soluble in blood than Nitrogen at high pressure

[B] It is Lighter than Nitrogen

[C] It is readily miscible in oxygen

[D] It is less poisionous than Nitrogen

Answer: It's less soluble in blood than Nitrogen at high pressure

(18) Which of following is not correct for noblegas?

[A] Ar is used in electric bulbs

[B] Kr is obtained during radioactive disintegration

[C] Half life of Rn is 3.8 days

[D] He is used to produce Low temp

Answer: Kr is obtained during radioactive disintegration

(19) Which of following represents noble gas configuration.

[A] 1S², 2S² 2P⁶, 3S² 3P⁵

[B] 1S², 2S² 2P⁶, 3S² 3P⁶

[C] 1S², 2S² 2P⁶

[D] 1S² , 2S²

Answer: 1S², 2S² 2P⁶, 3S² 3P⁶

(20) Which of following has zero valency

[A] Sodium

[B] Beryllium

[C] Aluminium

[D] Krypton

Answer: Krypton

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

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