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Hydrogen from Acids

Indicate whic...

Question

Indicate which of the following statements are true and which are false :

(a) Hydrogen molecule is monovalent.

(b) The removal of hydrogen from a substance is called reduction.

(c)Nitric acid can not be used to prepare hydrogen by its action on active metals.

(d) The reaction between hydrogen and nitrogen to from ammonia is reversible.

(e) Zinc can liberate hydrogen from water, acid and alkali solution.

(f) Hydrogen is combustible as well as a supporter of combustion.

(g) Hydrogen gas is easily liquefiable.

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Solution

Answer:
(a) False
(b) True
(c) False. Hydrogen cannot be prepared by the action of nitric acid on metals because it also releases
nitrous oxide and nitric oxide.
(d) True
(e) True
(f) False
(g) False

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Similar questions

Correct the following statements :

(a) Hydrogen is used as a fuel for rocket propulsion.

(b) All metals react with acids to give hydrogen.

(c) Metals adsorb hydrogen.

(d) Very dilute nitric acid reacts with zinc to produce hydrogen.

(e) $C o n c . H_{2} S O_{4}$ reacts with zinc to liberate hydrogen.

(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.

(a) Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare

(i) hydrogen chloride

(ii) water

(iii) sodium hydroxide

(iv) hydrochloric acid

(b) The metal which reacts with cold water to produce hydrogen is

(i) magnesium

(ii) aluminium

(iii) calcium

(iv) iron

(c) In metal reactivity series the more reactive metals are at

(i) top

(ii) bottom

(iii) middle

(iv) none

(d) Hydrogen is responsible for producing

(i) heat and light

(ii) hydrogenated oil

(iii) fertilizers

(iv) all of the above

(e) Hydrogen is

(i) combustible

(ii) non-combustible

(iii) supporter of combustion

(iv) neither supporter nor combustible

(f) Water gas is a mixture of

(i) carbon monoxide and oxygen

(ii) carbon monoxide and hydrogen

(iii) hydrogen and oxygen

(iv) hydrogen and nitrogen

Which of the following metals can be used for liberating hydrogen from dilute hydrochloric acid? Write reactions as well.

Fill in the blanks.

(a) Hydrogen is ___ than air.

(b) Hydrogen is ___ soluble in water.

(c) Hydrogen burns with a ___ flame and ___ sound is heard.

(d) A Metal ___ hydrogen in the reactivity series gives hydrogen with ___

(e) Hydrogen reacts with metal oxides to form ___ and ___

(f) Oxidation is the removal of ___ or addition of ___

(g) In redox reactions oxidation and reduction occur ___

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Hydrogen from Acids

Standard VIII Chemistry

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