Q.1 The colour of cuso4 .5 H2O is
a) Black b) Blue c) Red d) Green.
Q.2 ZnO + C gives Zn + CO
Which one is oxidising agent.
a) ZnO b) C. c) CO d) none of these.
Q.3 Decomposition of lead nitrate evolve
a) H2. b) CO2 c) NO2 d) SO2
Q.4 When CO2 is passed through lime water .The compound formed is.
a) CaCO3. b) Ca(OH)2. c ) CaCl2 d.) CaO
Q.5 classify the electrolysis of water
a ) combination reaction b) decomposition reaction c) displacement reaction d)double displacement reaction.
Q.6 Assertion . Suspension of slaked lime is called calcium hydroxide.
Reason. It is exothermic in nature.
Q.7 Assertion. Combination reaction is oxidation reaction.
Reason. Single reactant is breakdown.
Q.8 Assertion.Glucose combine with oxygen in respiration.
Reason .heat and CO2 is released .
Q.9 Assertion . In Skeletal equation mass neither be created nor be destroyed.
Reason. Law of conservation of mass is obeyed.
Q 10. Photo decomposition takes place in the presence of light only.
Reason. These reaction are also known as redox reaction.
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Answer:
1st ans is b.It is known as blue vitriol
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