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Acid Rain

On heating co...

Question

On heating compound $(A)$ gives a gas $(B)$ which is a constituent of air. This gas when treated with $3$ mol of hydrogen $(H_{2})$ in the presence of a catalyst gives another gas $(C)$ which is basic in nature. Gas $C$ on further oxidation in moist condition gives a compound $(D)$ which is a part of acid rain. Identify compounds $(A)$ to $(D)$ and also give necessary equations of all the steps involved.

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Solution

$A = N H_{4} N O_{2};$ $B = N_{2};$ $C = N H_{3};$ $D = H N O_{3}$

As per the given condition:

(a) $N H_{4} N O_{2} \to N_{2} + 2 H_{2} O$
A B

(b) $N_{2} + 3 H_{2} c a t a l y s t - --- \to 2 N H_{3}$
B C

(c) $N H_{3} + 5 O_{2} \to 4 N O + 6 H_{2} O$
C D

Acid rain:

$2 N O + O_{2} \to 2 N O_{2}$

$3 N O_{2} + H_{2} O \to 2 H N O_{3} + N O$

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Question 59
A non-metal A, which is the largest constituent of air, when heated with $H_{2}$ in 1:3 ratio in the presence of catalyst $Fe$ , gives a gas B.
On heating with $O_{2}$ , it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D, which acts as a strong oxidising agent.

(a) Identify A, B, C and D
(b) To which group of periodic table does this non-metal belong?

Q. On mixing the aqueous solutions of compounds

(A)

(B)

, an insoluble compound

(C)

is produced along with another water soluble compound

(D)

(A)

on heating gives brown

N O_{2}

gas with a cracking noise. An aqueous solution of compound

(A)

gives black ppt. with

H_{2} S

(A)

also gives white ppt. with dil.

H C l

which is soluble in hot water and reappears on cooling. The hot water extract of compound

(A)

gives yellow ppt. with

K_{2} C r O_{4}

Q. (i) A black mineral (A) on heating in presence of air gives a gas (B).
(ii) The mineral (A) on reaction with dilute

H_{2} S O_{4}

gives a gas (C) and solution of a compound (D).
(iii) On passing gas (C) into an aqueous solution (B), a white turbidity is obtained.
(iv) The aqueous solution of compound (D) on reaction with potassium ferricyanide gives a blue compound (E).

Compounds (A) to (E) are identified as:

F e S

S O_{2}

H_{2} S

F e S O_{4}

K F e^{I} I [F e^{I} I I (C N)_{6}]

If true enter 1, else enter 0.

Q. Calcium imide on hydrolysis gives a gas

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, which on oxidation by bleaching powder gives a gas

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C

on reaction with magnesium gives a compound

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B, C

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Q. An organic compound (A) on heating produces two gases (B) and (C) and neutral oxide (D) which turns cobalt chloride paper pink. Gas (B) turns lime water milky and produces an acidic solution, with water. Gas (C) produces a poisonous gas (E) with chlorine gas, this gas with ammonia gives an organic compound (F) which on further reaction with (D) gives

N H_{3}

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