Chemistry
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
(a) a monovalent metal
(b) divalent metal
Related Questions
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.
(a) Where does Hydrogen occur in free state?
(b) How did the name 'hydrogen' originate?
Which metal is preferred for preparing hydrogen from:
(a) cold water?
(b) hot water?
(c) steam?
Write balanced equation for each case.
Hydrogen may be prepared in the laboratory by the action of a metal with an acid.
(a) Which of the metals copper, zinc, magnesium or sodium would be the most suitable?
(b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric and concentrated nitric would you choose? Explain why you would not use the acids you rejected.
(c) How would you modify your apparatus to collect dry hydrogen? Which drying agent would you employ for this purpose?