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Chemistry
61)The element which forms largest number of compounds with hydrogen is
	silicon		carbon
	oxygen		boron
Answer :
62)The gas used in fire extinguishers is
	carbon dioxide		carbon monoxide
	sulphur dioxide		oxygen
Answer :
63)The gas that can be used as fuel is
	oxygen		nitrogen
	methane		flourine
Answer :
64)The gas whose aqueous solution is strongly acidic in nature is
	phosphine		hydrogen sulphide
	ammonia		sulphur dioxide
Answer :
65)The element silicon is present in
	salt		sand
	coal		limestone
Answer :
66)The industrial preparation of the metal aluminium from boxite involves the process of
	fractional crystallisation		electrolysis
	fractional distillation		reduction
Answer :
67)In natural gas, the compound present in major amounts is made up of hydrogen and
	carbon		sulphur
	calcium		nitrogen
Answer :
68)The manufacturing of iron from ore involves the process of
	electrolysys		fractional distillation
	reduction		chlorination
Answer :
69)The commercially useful property of both ethylene and styrene is their ability
	hydrolysis		polymerization
	reduction		oxidation
Answer :
70)The compound dissolved in water to give a solution of pH lower than seven is
	ethanol		sugar
	vinegar		common salt
Answer :
71)The substance whose aqueous solution would be a better conductor of electricity than water is
	cane sugar		ethyl alcohol
	glucose		common salt
Answer :
72)Pure alcohol can be obtained from wine by the process of
	distillation		oxidation
	cracking		reduction
Answer :
73)The gas which, on heating at high temperature under high pressure, transforms into a waxy solid is
	hydrogen		acetylene
	ethylene		chlorine
Answer :
74)The substance present in abundant amount in sea water is
	sugar		sand
	calcium carbonate		common salt
Answer :
75)The atomic number of an element is equal to the
	relative atomic mass		number of electrons in its outermost orbit
	number of protons in its nucleus		number of neutrons in its nucleus
Answer :

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