Chemistry
Elements which show unique nature in the preparation of hydrogen are
- Na, K, Li
- Mg, Ca, Ba
- Al, Zn, Pb
- Fe, Cu, Ag
Hydrogen
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Answer
Al, Zn, Pb
Reason — Metals like zinc, aluminium and lead are considered to have a unique nature in the preparation of hydrogen. They react with acids and can even react with hot concentrated alkalis to form hydrogen and a soluble salt.
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Related Questions
The composition of the nucleus of deuterium is:
- 1e– and 1P
- 1P and 1n
- 1n and 1e
- 2P and 1e–
Give the reason for the following
(a) Zinc granules are used in the lab preparation of hydrogen.
(b) Purified and dried hydrogen is collected over mercury.
(c) The end of the thistle funnel should be dipped under acid.
(d) Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.
Hydrogen is evolved by the action of cold dil. HNO3 on
- Fe
- Cu
- Mg
- Zn
Which metal produces hydrogen gas on reaction with cold water?
- Al
- Fe
- Pd
- Na