2. Give suitable reasons for the following statements:
(i) Rain water conducts electricity but distilled water does not.
(ii) We feel burning sensation in the stomach when we over eat.
(iii) A tarnished copper vessel regains its shine when rubbed with lemon.
(iv) The crystals of washing soda change to white powder on exposure to air.
(v) An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic.
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Answers
1 The availability of ions is very important to conduct electricity. Distilled water is a pure type of water which does not contain any ions in it. ... Thus rainwater is conducting electricity while distilled water is not conducting electricity.
2 When we overeat excess of acid is produced in the stomach which causes burning sensation. or
2 When we overeat excess of acid is produced in the stomach which causes burning sensation.
3 Due to neutralization reaction the tarnished copper vessel regains its shine when rubbed with lemon. Explanation: Tarnished copper means an oxide layer is formed on the surface of copper metal. ... Hence, due to this neutralization reaction the tarnished copper vessel regains its shine when rubbed with lemon.
4 When sodium carbonate crystals are exposed to air They lose water of crystallization and turn to white powder. This process of loosing water of crystallization when exposed to air is called efflorescence.
5 Aqueous solution of NaCl contains equal number of H+ and OH- ions,hence it is neutral in nature. On other hand,sodium carbonate is a salt of weak acid H₂CO₃ and strong base NaOH. ... Thus salt solution contains OH- ions. Hence aqueous solution of sodium carbonate is basic in nature.
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Answer:
1 The availability of ions is very important to conduct electricity. Distilled water is a pure type of water which does not contain any ions in it. Thus rainwater is conducting electricity while distilled water is not conducting electricity.
2 When we overeat excess of acid is produced in the stomach which causes burning sensation. or
2 When we overeat excess of acid is
produced in the stomach which causes
burning sensation.
3 Due to neutralization reaction the tarnished copper vessel regains its shine when rubbed with lemon. Explanation: Tarnished copper means an oxide layer is formed on the surface of copper metal. Hence, due to this neutralization reaction the tarnished copper vessel regains its shine when rubbed with lemon. ...
4 When sodium carbonate crystals are exposed to air They lose water of crystallization and turn to white powder. This process of loosing water of crystallization when exposed to air is called efflorescence.
5 Aqueous solution of NaCl contains equal number of H+ and OH- ions,hence it is neutral in nature. On other hand,sodium carbonate is a salt of weak acid H₂CO3 and strong base NaOH. ... Thus salt solution contains OH- ions. Hence aqueous solution of sodium carbonate is basic in nature.