Chemistry
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 …………… .
Hydrogen
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Answer
(a) lighter
(b) sparingly
(c) pale blue, pop
(d) above, dilute acids
(e) metal, water
(f) hydrogen, oxygen
(g) simultaneously
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Related Questions
Assertion (A): Hydrogen is used for the extraction of less reactive metals like copper and lead.
Reason (R): Hydrogen is a good reducing agent.
- 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.
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.
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.
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