Isotopes of an element do not have ______.
(A) Same number of electrons
(B) Same number of protons
(C) Same chemical properties
(D) Same physical properties
Gold is alloyed with which metal to make it harder?
(A) C
(B) Sn
(C) Cu
(D) Ag
The general name of the elements of 17th group are
(A) Metals
(B) Noble gases
(C) Transition elements
(D) Halogens
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
Which of the following is used as a lubricant in heavy machines?
(A) Phosphorus
(B) Graphite
(C) Bauxite
(D) Sulphur
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