Decomposition ReactionOnline version Std 10 -Chemical Reactions and Equations by pifly .. 1 What is the colour of ferrous sulphate crystals before heating? Choose one or more answers a White b Blue c Green d Yellow 2 What gas is released when lead nitrate is heated? a Oxygen b Nitrogen dioxide c Hydrogen d Carbon dioxide 3 Which type of decomposition uses electricity to break down compounds? a Thermal b Photolytic c Electrolytic d Catalytic 4 What is the formula of quick lime? a CaCO₃ b CaO c Ca(OH)₂ d CaCl₂ 5 What change is observed when silver chloride is kept in sunlight? a It melts b It turns blue c It turns grey d It gives off a smell 6 In the electrolysis of water, which gas is collected in double amount? a Oxygen b Nitrogen c Hydrogen d Carbon dioxide 7 Which of the following is an example of a photolytic decomposition reaction? a Decomposition of lead nitrate b Heating of calcium carbonate c Electrolysis of water d Decomposition of silver bromide 8 What is the reaction type where energy is absorbed? a Exothermic b Substitution c Endothermic d Neutralization 9 What type of reaction is used in black and white photography? a Thermal decomposition b Electrolytic decomposition c Photolytic decomposition d Precipitation reaction 10 What do you feel when barium hydroxide reacts with ammonium chloride? a The test tube becomes hot b The test tube becomes cold c A flame appears d A gas explodes
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