Question

Assertion:Calcium carbide on hydrolysis gives methane.
Reason:Calcium carbide contains \[{C^{4 - }}\] anions.
(a) Both, A and R, are true and R is the correct explanation of A
(b) Both, A and R, are true but R is not the correct explanation of A
(c) If A is true but R is false
(d) Both a and R are false

Answer 1

Hint: Any chemical reaction in which a water molecule breaks one or more chemical bonds is known as hydrolysis. The phrase refers to any substitution, elimination, or solvation process in which the nucleophile is water. Biological hydrolysis is the cleavage of biomolecules that involves the consumption of a water molecule in order to separate a bigger molecule into component components. Saccharification occurs when a carbohydrate is hydrolyzed into its component sugar molecules (for example, sucrose is broken down into glucose and fructose).

Complete answer:
The chemical compound calcium carbide, commonly known as calcium acetylide, has the chemical formula \[Ca{C_2}\]. It is primarily used in the manufacture of acetylene and calcium cyanamide in industry.
Colorless is the pure substance. Technical-grade calcium carbide produces an unpleasant garlic-like odour when exposed to trace moisture. Calcium carbide is used in the production of acetylene gas and the creation of acetylene in carbide lamps, as well as the production of fertiliser chemicals and steelmaking.
Friedrich Wöhler discovered the interaction of calcium carbide with water, which produces acetylene and calcium hydroxide, in 1862.
\[Ca{C_2} + 2{H_2}O \to Ca{(OH)_2} + C{_2}{H_2}\]
\[Ca{C_2} \to C{a^{2 + }} + {[{C_2}]^{2 - }}\]
This reaction is the primary industrial use of calcium carbide and provides the basis for the industrial production of acetylene.
Today, acetylene is mostly produced by partial burning of methane or as a byproduct of hydrocarbon cracking in the ethylene stream. This method produces around 400,000 tonnes per year (see Acetylene Preparation).

Hence option d is correct.

Note:
Acetylene produced from calcium carbide is still used as a raw material in China's chemical sector, particularly for the manufacture of polyvinyl chloride. It is more cost effective to use locally generated acetylene than imported oil. China has been expanding its calcium carbide production. With a capacity of 17 million tonnes, output in 2005 was 8.94 million tonnes. Calcium carbide usage is decreasing in the United States, Europe, and Japan. During the 1990s, the United States produced 236,000 tonnes each year.