What are main constituents of biogas?

Q. Carbon and oxygen react to produce carbon dioxide. What is the weight of oxygen required to convert $1.5g$ of carbon to carbon dioxide?

Q.

Carbon Dioxide, Methane and Carbon Monoxide are greenhouse gases.

Q.

Carbon dioxide, dissolved in water, can dissolve rocks containing calcium carbonate and magnesium carbonate. What are the respective salts formed?

Q.

Which one chemical reaction occurs during photosynthesis ?

(a) Carbon dioxide is reduced and water is oxidised.

(b) Water is reduced and carbon dioxide is oxidised.

(c) Both carbon dioxide and water are oxidised.

(d) Both carbon dioxide and water are reduced.

Q. Assertion :Beryllium carbonate is kept in the atmosphere of carbon dioxide Reason: Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide