SATHEE: sblock Elements 2 Question 22

sblock Elements 2 Question 22

24. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $A$ and an alkaline solution. The solution on exposure to air produces a thin solid layer of $B$ on the surface. Identify the compounds $A$ and $B$ .

(1996, 3M)

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Solution:

$A = {NH}_{3}, B = {CaCO}_{3}$ .

Reactions involved are :

$\begin{aligned} 3 Ca + N_{2} \overset{Heat}{\to} {Ca}_{3} N_{2} \\ {Ca}_{3} N_{2} + 6 H_{2} O ⟶ 3 Ca (OH)_{2} + \underset{A}{2 {NH}_{3}} \\ Ca (OH)_{2} + \underset{(From air)}{{CO}_{2}} ⟶ \underset{B}{{CaCO}_{3}} + H_{2} O \end{aligned}$

sblock Elements 2 Question 22

24. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $A$ and an alkaline solution. The solution on exposure to air produces a thin solid layer of $B$ on the surface. Identify the compounds $A$ and $B$ .

Solution:

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sblock Elements 2 Question 22

24. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution. The solution on exposure to air produces a thin solid layer of B on the surface. Identify the compounds A and B.

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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24. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $A$ and an alkaline solution. The solution on exposure to air produces a thin solid layer of $B$ on the surface. Identify the compounds $A$ and $B$ .