1--The bell metal is an alloy of--Tin and copper
2--Parsec is a measure of--Orbital velocity of giant stars
3--By fixation of nitrogen is meant--Conversion of atmospheric nitrogen into Useful compounds
4--The manufacture of iron ore Involves the process of--Reduction
5--A double convex air bubble in water would Behave as a--Divergent lens
6--Oxygen is manufactured by the fractional Evaporation of--Liquid air
7--Sodium burns in air to give--Sodium peroxide
8--Rust is--A mixture of Fe2O3.3H2O and Feo
9--During burnings of fuels, carbon and Hydrogen present in the fuels are--Converted into carbon dioxide and Water vapour
10--The phenomenon of “metamerism” is Shown by--Methyl propylether and diethyl ether
11--If two liquids have widely different boiling Points, they may be separated by--Fractional distillation
12--German Silver is an alloy of--Zinc, Copper & Nickel
13--From which mineral is radium obtained--Pitchblende
14--Alloys is used for making magnets--Alnico
15--Which is used in making smoke bombs --Phosphorus
16--Carborandum is--Silicon Carbide
17--Permanent hardness of water can be removed by adding--Washing Soda
18--The chemical name of Uria is--Carbamide
19--The presence of which salts in water causes corrosion in steam boilers--Magnesium Chloride
20--The element required for Solar energy conversion--Silicon
3--By fixation of nitrogen is meant--Conversion of atmospheric nitrogen into Useful compounds
4--The manufacture of iron ore Involves the process of--Reduction
5--A double convex air bubble in water would Behave as a--Divergent lens
6--Oxygen is manufactured by the fractional Evaporation of--Liquid air
7--Sodium burns in air to give--Sodium peroxide
8--Rust is--A mixture of Fe2O3.3H2O and Feo
9--During burnings of fuels, carbon and Hydrogen present in the fuels are--Converted into carbon dioxide and Water vapour
10--The phenomenon of “metamerism” is Shown by--Methyl propylether and diethyl ether
11--If two liquids have widely different boiling Points, they may be separated by--Fractional distillation
12--German Silver is an alloy of--Zinc, Copper & Nickel
13--From which mineral is radium obtained--Pitchblende
14--Alloys is used for making magnets--Alnico
15--Which is used in making smoke bombs --Phosphorus
16--Carborandum is--Silicon Carbide
17--Permanent hardness of water can be removed by adding--Washing Soda
18--The chemical name of Uria is--Carbamide
19--The presence of which salts in water causes corrosion in steam boilers--Magnesium Chloride
20--The element required for Solar energy conversion--Silicon
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