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Chemistry
2. Acids, Bases and Salts
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Q16 of 30 Page 34

Overhead cables are never kept taut why should they be kept slack?

Overhead cables are never kept taut why should they be kept slack because:

i. In summer, they can expand their size because of too much heat.


ii. In winter, they can become tight because of too much cold.


iii. Hence, the overhead cables are kept loose so that the change of weather cannot affect them.



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14

State what happens when a concentrated solution of sodium chloride is electrolyzed? Name the process. Write the equation of the reaction involved. Write the names of products obtained. Mention one use of each product.

15

Solid sodium chloride does not conduct electricity while sodium chloride solution conducts. Explain why.

17

A compound 'P' forms the enamel of teeth. It is the hardest substance of the body. It doesn't dissolve in water but gets corroded when the pH is lowered below 5.5. (a) Identify the compound 'P.' (b) How does it undergo damage due to the eating of chocolate and sweets? What should we do to prevent tooth decay?

18

A dry pellet of a common base 'B', when kept in open, absorbs moisture and turns sticky. The compound is also formed by chloralkali process. Identify B. What type of reaction occurs when B is treated with dilute hydrochloric acid. Write the chemical equation.

Questions · 30
2. Acids, Bases and Salts
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