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Standard X

Physics

Resistance

Assertion : ...

Question

Assertion : $Z n$ gives $H_{2}$ gas with dil. $H C l$ and also with dil $H_{2} {S O}_{4}$ . Reason: ${N O}_{3}^{-}$ ion is reduced in preference to hydronium ion.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Zinc is more electropositive than hydrogen. hence, it can displace hydrogen from acids such as HCl and sulphuric acid.
Similarly, N is more electronegative than hydrogen. Hence, ${N O}_{3}^{-}$ ion is reduced in preference to hydronium ion.

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Similar questions

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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and

H e

can be derived from Van der Waal's equation.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

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Reason:

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formed by decomposition of

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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 : In the bonding molecular orbital (MO) of

H_{2}

, the electron density is increased between the nuclei.
Reason : The bonding MO is

ψ_{A} + ψ_{B}

, which shows destructive interference of the combining electron waves.

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.

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Assertion :Zn gives H2 gas with dil. HCl and also with dil H2SO4. Reason: NO−3 ion is reduced in preference to hydronium ion.

Assertion : $Z n$ gives $H_{2}$ gas with dil. $H C l$ and also with dil $H_{2} {S O}_{4}$ . Reason: ${N O}_{3}^{-}$ ion is reduced in preference to hydronium ion.