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1.
2.
The brown gas evolved on heating of copper nitrate is
3.
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature ?
4.
Which one of the following processes involve chemical reactions ?
5.
6.
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
7.
Which of the following is (are) an endothermic process(es) ?
(z) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water
(z) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water
8.
Electrolysis of water is a decomposition reaction. The molar ratio of hydrogen and oxygen gases liberated during electrolysis of water is
9.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved ?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
10.
Which among the following is (are) double displacement reactions ?
(i) Pb + CuCl2 --> PbCl2 + Cu
(ii) Na2SO4 + BaCl2 --> BaSO4 + 2NaCl
(iii) C + O2 --> CO2
(iv) CH4 + 2O2 --> CO2 + 2H2O
(i) Pb + CuCl2 --> PbCl2 + Cu
(ii) Na2SO4 + BaCl2 --> BaSO4 + 2NaCl
(iii) C + O2 --> CO2
(iv) CH4 + 2O2 --> CO2 + 2H2O