MCQ Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 14

The electronic configuration of chlorine is _________

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2, 7
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2, 8, 8, 7
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2, 8, 7
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2, 7, 8

In which of the following, oxidation number of chlorine is

$+ 5 ?$

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$Cl_{2}O_{7}$
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$\mathrm { ClO } _ { 3 } ^ { - }$
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$\mathrm { CHO } ^ { - }$
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$\mathrm { ClO } _ { 4 } ^ { - }$

Explanation

Oxidation number of

$Cl_2O_7$ :-

$2x-14=0$

$x=7$

Oxidation number of

${ClO_3}^{-}$ :-

$x-6=-1$

$x=5$

Oxidation number of

$ClO^-$ :-

$x-2=-1$

$x=1$

Oxidation number of

${ClO_4}^-$ :-

$x-8=-1$

$x=7$

hence option B is correct.

Which of the following compounds undergoes haloform reaction?

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$CH_{3}COCH_{3}$
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$HCHO$
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$CH_{3}CH_{2}Br$
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$CH_{3} - O - CH_{3}$

Explanation

The haloform reaction comprises the reaction of a halogen with a methyl ketone (a molecule containing the

$R–CO–CH_3$ grouping) in the presence of a base.

Among the given compound, propanone undergoes haloform reaction as it contains a methyl group attached to carbonyl carbon.

Hence, option A is correct.

Which of the following is correct statement regarding

$N(CH_3)_3$ and

$N(SiH_3)_3$ ?

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$N(SiH_3)_3$ is planar and more basic than $N(CH_3)_3$
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$N(SiH_3)_3$ is planar and less basic than $N(CH_3)_3$
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$N(CH_3)_3$ is planar and more basic than $N(SiH_3)_3$
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$N(CH_3)_3$ is pyramidal and less basic than $N(SiH_3)_3$

Explanation

$N(SiH_3)_3$ is planar due to back bonding and

$N(CH_3)_3$ more basic due to presence of lone pair electrons.

What is the action of following reagents on ammonia ?

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i)Excess of air
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ii)Excess of chlorine
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iii)Na metal
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none of these

Which of the following is incorrect?

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Red $P$ is toxic
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White $'P'$ is highly soluble in $CS_{2}$
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Black $'P'$ is thermodynamic is most stable
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White $'P'$ is soluble in $NaOH$ evolves $PH_{3}$

Which of the following is true for

$N_{2}O_{5}$ ?

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Paramagnetic
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Anhydride of $HNO_{2}$
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Brown gas
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Exist in solid In form of $[NO^{+}_{2}][NO_{3}^{-}]$

Explanation

$N_{2}O_{5}$ in solid form exists as

$NO_{3}^{-}$ and

$NO_{2}^{-}$ .

CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 14 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 14 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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