Assertion : $N H_{3}$ gas is dried by $C a O$ and not by $P_{2} O_{5}$ and $H_{2} S O_{4}$ . Reason: Moist $N H_{3}$ can react with $P_{2} O_{5}$ forming phosphate and sulphate with conc. $H_{2} S O_{4}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$6 N H_{3} + P_{2} O_{5} + 3 H_{2} O ⟶ 2 (N H_{4})_{3} P O_{4}$
$2 N H_{3} + H_{2} S O_{4} ⟶ (N H_{4})_{2} S O_{4}$
Hence, can't be used for drying $N H_{3}$ . $C a O$ being basic would only cause drying of $N H_{3}$ .

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Similar questions

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

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Assertion :NH3 gas is dried by CaO and not by P2O5 and H2SO4. Reason: Moist NH3 can react with P2O5 forming phosphate and sulphate with conc. H2SO4.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion6NH3+P2O5+3H2O⟶2(NH4)3PO4 2NH3+H2SO4⟶(NH4)2SO4Hence, can't be used for drying NH3. CaO being basic would only cause drying of NH3.

Assertion : $N H_{3}$ gas is dried by $C a O$ and not by $P_{2} O_{5}$ and $H_{2} S O_{4}$ . Reason: Moist $N H_{3}$ can react with $P_{2} O_{5}$ forming phosphate and sulphate with conc. $H_{2} S O_{4}$ .