Engineer & Medical

General Principles and Pr question bank (Chemistry)

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Q1.

Identify the incorrect pair from the following :

(A)

Fluorspar-

{BF}_{3}

(B)

Cryolite-

{Na}_{3} {AlF}_{6}

(C)

Fluoroapatite-

3 {Ca}_{3} {({PO}_{4})}_{2} \cdot {CaF}_{2}

(D)

Carnallite-

KCl \cdot {MgCl}_{2} \cdot 6 H_{2} O

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Q2.

Which one of the following is not an example of calcination?

(A)

{CaCO}_{3} \overset{∆}{\to} CaO + {CO}_{2}

(B)

{Fe}_{2} O_{3} . {xH}_{2} O \overset{∆}{\to} {Fe}_{2} O_{3} + {xH}_{2} O

(C)

2 PbS + 3 O_{2} \overset{∆}{\to} 2 PbO + 2 {SO}_{2}

(D)

{CaCO}_{3} . {MgCO}_{3} \overset{∆}{\to} CaO + MgO + 2 {CO}_{2}

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