Most of the metals do not displace hydrogen from _____ acid.

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Solution

Nitric acid is a strong oxidizing agent. So, it oxidizes the hydrogen to $w a t e r$ and itself gets reduced to any $n i t r o g e n o x i d e$ .
Hence, when metal reacts with concentrated nitric acid, it forms water as a product.

So the correct answer is nitric.

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Q. Two metals which will displace hydrogen and two metals which will not displace hydrogen from dilute acids, respectively are

(a) Explain why metals usually do not liberate hydrogen gas with dilute nitric acid.
(b) Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.

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Most of the metals do not displace hydrogen from _____ acid.

Nitric acid is a strong oxidizing agent. So, it oxidizes the hydrogen to water and itself gets reduced to any nitrogen oxide.Hence, when metal reacts with concentrated nitric acid, it forms water as a product.So the correct answer is nitric.

Nitric acid is a strong oxidizing agent. So, it oxidizes the hydrogen to $w a t e r$ and itself gets reduced to any $n i t r o g e n o x i d e$ .
Hence, when metal reacts with concentrated nitric acid, it forms water as a product.

So the correct answer is nitric.