CBSE 10th Standard Science Subject Chemical Reactions and Equations HOT Questions 1 Mark Questions 2021
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CBSE 10th Standard Science Subject Chemical Reactions and Equations HOT Questions 1 Mark Questions 2021
10th Standard CBSE
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Reg.No. :
Science
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What happens to idli dough when it is kept at room temperature on a summer day?
(a)Anaerobic respiration
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People living in coastal areas use plastic articles than iron articles for their day to day activities. Why?
(a)High humidity
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The decomposition of vegetable matter in to compost is an example of what type of reaction?
(a)Exothermic reaction.
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Which term is used to indicate the development of unpleasant smell and taste in butter and oil containing food?
(a)Oxidation
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Ashok wanted his house to white washed. He bought 10kg quick lime from market and dissolved it in 30 liters of water. On adding lime to water he noticed that bubbles were produced and the solution becomes hot. Give reason and name the product formed.
(a)It happen because when we react quick lime with water it releases heat energy and due to this it produces bubbles in water.
Product is
CaO + H2O → Ca(OH)2 + heat
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CBSE 10th Standard Science Subject Chemical Reactions and Equations HOT Questions 1 Mark Questions 2021 Answer Keys
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Anaerobic respiration
Anaerobic respiration
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High humidity
High humidity
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Exothermic reaction.
Exothermic reaction.
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Oxidation
Oxidation
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It happen because when we react quick lime with water it releases heat energy and due to this it produces bubbles in water.
Product is
CaO + H2O → Ca(OH)2 + heatIt happen because when we react quick lime with water it releases heat energy and due to this it produces bubbles in water.
Product is
CaO + H2O → Ca(OH)2 + heat
