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Extraction of Iron

Iron chromite...

Question

Iron chromite $(F e C r_{2} O_{4})$ on reaction with sodium carbonate in presence of $O_{2}$ forms chromium containing compound $M .$ The solution of compound $M$ is filtered and acidified with sulphuric acid to give a chromium containing crystalline compound $N .$ If solution of $N$ reacts with $K C l$ then forms chromium containing compound $O .$

A

C

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B

D

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C

A

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D

B

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Solution

The correct option is C A
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Q. When chromite ore

F e {C r}_{2} O_{4}

N a O H

in presence of air, a yellow coloured compound (A) is obtained which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with

K C l

forms a orange coloured crystalline compound (C).
(i) Write the formulae of the compounds (A), (B), and (C).
(ii) Write one use of compound (C).
OR
Complete the following chemical equations:
(i)

8 M n O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to

{C r}_{2} O_{7}^{2 -} + 3 {S n}^{2 +} + 14 H^{+} \to

Q. An organic compound

C H_{3} C H (O H) C H_{3}

on treatment with acidified

K_{2} C r_{2} O_{7}

gives a compound

Y

, which reacts with

I_{2}

and sodium carbonate to form triiodomethane. The compound

Y

Q. A four carbons atoms containing neutral organic compound X reacts with sodium metal to evolve a gas which burns with 'pop' sound. Another four carbon atoms containing carbon compound reacts with sodium hydrogen carbonate to evolve a gas which turns lime water milky. When compounds X and Y are heated together in the presence of a little of concentrated sulphuric acid, then a new compound Z is formed.

(a) What is compound X ? Also write its formula.
(b) What is compound Y ? Also write its formula.
(c) What is compound Z ? Also write its formula.
(d) What type of smell is given by compound Z?
(e) What is the general name of compounds like Z?
(f) What is the general name of the reaction which takes place between X and Y to form Z?

Q. In Kjeldahl's method,organic compound containing nitrogen after reacting with concentrated sulphuric acid forms:

Q. A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by

H N O_{2}

to give an unstable compound B. B, on treatment with phenol,forms a beautiful coloured compound C with the molecular formula

C_{12} H_{10} N_{2} O

. The structure of compound 'A' isRead more on Sarthaks.com - https://www.sarthaks.com/231600/given-nitrogen-containing-aromatic-compound-reacts-with-followed-hno2-unstable-compound

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