Chemistry - Study Mode

[#956] The biogas used for cooking is a mixture of which of the following?
Correct Answer

(D) Methane and carbon dioxide

Explanation

Solution: Biogas is essentially a mixture of Methane (CH 4 , around 55-75%) but also contains Carbon Dioxide (CO 2 ), around 25-30%), varying quantities of Water (H 2 O) and Hydrogen Sulphide (H 2 S). Other compounds can also be found, especially in waste dump biogas: Ammonia (NH 3 ), Hydrogen (H 2 ), Nitrogen (N 2 ) and Carbon Monoxide (CO). Methane is the valuable component under the aspect of using biogas fuel.

[#957] The major constituent of gobar gas is
Correct Answer

(B) Methane

Explanation

Solution: Biogas mainly comprises of three main gases. It is a mixture of methane, hydrogen, and carbon dioxide.

[#958] ________ is a by product of sewage treatment and can be decomposed to produce biogas
Correct Answer

(B) Sludge

Explanation

Solution: Sludge is a by product of sewage treatment and can be decomposed to produce biogas.

[#959] Which of the following could be used as fuel in propellant or rockets ?
Correct Answer

(D) Liquid Hydrogen + Liquid Oxygen

Explanation

Solution: Liquid hydrogen and liquid oxygen are used as propellent for rocket.

[#960] Which gas is used for converting vegetable oils into saturated fats ?
Correct Answer

(A) H 2

Explanation

Solution: Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H 2 ) and another compound or element, usually in the presence of a catalyst. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds.