The chemical name of limestone is?
(A) Sodium Chloride
(B) Sodium Sulphide
(C) Calcium carbonate
(D) Magnesium Chloride
Bronze is an alloy of –
(A) Copper and zinc
(B) Copper and Lead
(C) Copper and Tin
(D) Copper and Silver
Which of the following is used as a lubricant in heavy machines?
(A) Phosphorus
(B) Graphite
(C) Bauxite
(D) Sulphur
Which of the following gases is used in cigarette lighter?
(A) Propane
(B) Radon
(C) Butane
(D) Methane
Which carbohydrate is used in silvering of mirrors?
(A) Glucose
(B) Starch
(C) Fructose
(D) Sucrose
Table salt gets moist during rainy season because -
(A) sodium chloride contains some quantity of sodium iodide
(B) sodium chloride contains hygroscopic impurities like - magnesium chloride
(C) sodium chloride Is hygroscopic
(D) sodium chloride is deliquescent
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