Assignment No – 5
Acids, Bases and Salts
Que 41: What is the common
name of the compound CaOCl2?
Que 42:
Name the substance which on treatment with chlorine yields bleaching powder?
Que 43: Name the sodium
compound which is used for softening hard water.
Question
44: What will happen if a solution of sodium hydrocarbonate is heated? Give the
equation of the reaction involved.
Que 45:
Write an equation to show the reaction between Plaster of Paris and water.
Que 46. A white coloured powder is used by
doctors for supporting fractured bones. (a) Write chemical name and formula of
the powder. (b) When this white powder is mixed with water a hard-solid mass is
obtained. Write balanced chemical equation for the change.
Que 47. State reason for the following
statements:
(i)
Tap
water conducts electricity whereas distilled water does not.
(ii)
Dry hydrogen chloride gas does not turn blue
litmus red whereas dilute hydrochloric acid does.
(iii)
During
summer season, a milk man usually adds a very small amount of baking soda to
fresh milk.
(iv)
For
a dilution of acid, acid is added into water and not water into acid.
(v)
Ammonia
is a base but does not contain hydroxyl group.
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