4. Which of the following statements is incorrect?
(a) Most of the mass of the sun and stars is hydrogen.
(b) Hydrogen belongs to IA group and 1st period of the periodic table.
(c) Water gas is a mixture of equal volumes of carbon monoxide and hydrogen
(d) Copper reacts with dilute sulphuric acid and evolves hydrogen gas.
nenaration of hydrogen in
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(a) Most of the mass of the stars and our Sun consist of hydrogen.
(b) Hydrogen belongs to IA group and first period of the periodic table.
(c) Water gas is a mixture of equal volume of hydrogen and carbon monoxide.
(d) Copper does not react with dilute sulphuric acid and evolve hydrogen gas.
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