Dissolution of ammonium chloride in water is
Exothermic
Endothermic
Precipitation
Amphithermic
The symbol Hg stands for
Mercury
Copper
Silver
Gold
Which method is used to extract salts dissolved in sea water?
Evaporation
Crystallization
Filtration
When zinc powder is added to copper sulphate solution, the resulting solution is
Blue
Black
Colourless
Red
The chemical reaction in which a compound breaks down to two or more simple substances is called
Combination
Decomposition
Dissolution
Which of the following is a testimony to the high level of skill achieved by ancient iron smiths in the extraction and processing of iron?
The Iron Pillar in Qutub Minar
The Iron Pillar in Taj Mahal
The Iron Pillar in Red fort
The Iron Pillar in Jantar Mantar
Substances can again be classified into two types- What are they?.
Elements, compounds
Atoms, molecules
Pure substance, mixtures
Solutes, solvents
Which of the following is not a physical change?
Melting of ice
Boiling of water
Dissolution of sugar in water
Rusting
Silver nitrate + potassium bromide ---> silver bromide + Potassium nitrate.The above reaction is an example of:
Combination reaction
Decomposition reaction
Precipitation reaction
Displacement reaction
The symbol Fe stands for
Sodium
Potassium
Iron
Lead
