Chemistry
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 cannot be used to prepare hydrogen by its action on active metals.
(d) The reaction between hydrogen and nitrogen to form 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.
Hydrogen
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Answer
(a) False
Corrected statement — Hydrogen atom is monovalent; hydrogen molecule is diatomic.
(b) False
Corrected statement — The removal of hydrogen from a substance is called oxidation.
(c) True
(d) True
(e) True
(f) False
Corrected statement — Hydrogen is combustible but it is a non-supporter of combustion.
(g) False
Corrected statement — Hydrogen gas cannot be easily liquefied.
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Related Questions
Assertion (A): Oxyhydrogen flame is used for cutting and welding metals.
Reason (R): For cutting and welding metals, a low temperature is required.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
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 occurs …………… .
Match the statements in column A with those in column B.
Column A Column B A metal which reacts with cold water to form hydrogen. Reduction A gas which is inflammable and a non-supporter of combustion. Hydrogenation A process in which vanaspati ghee is prepared from vegetable oils. Oxidation The removal of hydrogen or addition of oxygen. Sodium The addition of hydrogen or removal of oxygen. Hydrogen Name the following:
(a) The process in which oxygen is added or hydrogen is removed.
(b) A process by which hydrogen gas is manufactured.
(c) A solid conductor through which current enters or leaves the electrolyte.
(d) The charged particles present in an electrolyte.
(e) A substance which removes oxygen from a compound.