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Extraction of Iron

Chalk is:

Question

Chalk is:

A

CaCO₃

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B

CaO

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C

CaOCl₂

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D

Ca(OH)₂

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Solution

The correct option is A
CaCO₃

Chalk is CaCO_3.

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Similar questions

A metal carbonate X on treatment with a mineral acid liberates a gas which when passed through aqueous solution of a substance Y gives back X. The substance Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorise coloured fabrics. The compounds X, Y and Z respectively are

Following reaction is used to remove temporary hardness which is due to dissolved bicarbonates of

C a^{2 +}

M g^{2 +}

C a (H C O_{3})_{2} + C a (O H)_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O

Actually lime (

C a O

) is added which in

H_{2} O

C a (O H)_{2}

and precipitates

C a C O_{3}

C a O + H_{2} O \to C a (O H)_{2}

10

L of hard water requires

0.56

C a O

, temporary hardness of

C a C O_{3}

x \times 10^{2}

x

$2 C a (O H)_{2} + 2 C l_{2} \to A - - + B - - + 2 H_{2} O$

A & B are

C a O C l_{2} + H_{2} O \to C a (O H)_{2} + X

:

X + C H_{3} C H O \to Y

Y + C a (O H)_{2} \to C H C l_{3}

Y

Q. A process designed to remove organic sulphur from coal prior to combustion involves the reaction.

X - S - Y + 2 N a O H \to X - O - Y + N a_{2} S + H_{2} O

C a C O_{3} \to C a O + C O_{2}

N a_{2} S + C O_{2} + H_{2} O \to N a_{2} C O_{3} + H_{2} S

C a O + H_{2} O \to C a (O H)_{2}

N a_{2} C O_{3} + C a (O H)_{2} \to C a C O_{3} + 2 N a O H

In the processing of 320 metric tons of a coal having 1.0% sulphur content, how much limestone

(C a C O_{3})

must be edecomposed to provide enough

C a (O H)_{2}

to regenerate the NaOH used in the original leaching step?

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