Sugar taken in a watch glass was found to be charred by adding a substance ' $X$ '.
(a) What is the substance ' $X$ '?
(b) What is the reason for charring of sugar?
(c) Which catalyst is used in the industrial preparation of the substance ' $X$ '?

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Solution

(a) Sulphuric acid
(b) Steam is given off and the whole mass gets heated because of an exothermic reaction to give a black spongy mass of carbon.
(c) $V_{2} O_{5}$

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Sugar taken in a watch glass was found to be charred by adding a substance 'X'.(a) What is the substance 'X'?(b) What is the reason for charring of sugar?(c) Which catalyst is used in the industrial preparation of the substance 'X'?

(a) Sulphuric acid(b) Steam is given off and the whole mass gets heated because of an exothermic reaction to give a black spongy mass of carbon.(c) V2O5

Sugar taken in a watch glass was found to be charred by adding a substance ' $X$ '.
(a) What is the substance ' $X$ '?
(b) What is the reason for charring of sugar?
(c) Which catalyst is used in the industrial preparation of the substance ' $X$ '?

(a) Sulphuric acid
(b) Steam is given off and the whole mass gets heated because of an exothermic reaction to give a black spongy mass of carbon.
(c) $V_{2} O_{5}$