1.
Name the acid present in
lemon juice, milk, bee sting
Ans: citric acid, lactic acid,
methanoic acid
2.
What name is given to an
indicator which gives different odour in different medium?
Ans: Olfactory indicator
3. How will you test with litmus paper that the given solution
is acidic or basic?
Ans: an acidic solution turns blue litmus red whereas a basic
solution turns red litmus blue.
4. Give one example each of a strong acid and weak acid.
Ans: strong acid : Hydrochloric acid
Weak acid: acetic acid
5.
Name the indicator which
can give us an idea of how strong or
weak an acid or base is.
Ans: Universal indicator
6.
Name the substance
obtained by the action of chlorine on dry slaked lime.
Ans : Bleaching powder
7. Which has a higher pH value, conc. HCl or dil. HCl?
Ans: Dil. HCl, because it has less amount of H+
ions.
8.
Name the from lichens acid
base indicator extracted
Ans: Litmus
9.
Name the sodium compound
which is used for softening hard water.
Ans: Sodium carbonate
10.
Name the acid present in
our stomach that helps in digestion.
Ans: Dil. HCl
11.
What is the ideal pH of
the soil for the healthy growth of a plant?
Ans: for the healthy growth of the plant the pH of the soil
should be neither too alkaline not highly acidic.
12.
Name the mild base used to
reduce acidity in the stomach.
Ans: Antacids e.g. Magnesium hydroxide
13.
What is the pH of rain
water that leads to acid rain?
Ans: when pH of rain water is less than 5.6, it is called
acid rain.
14.
What is the effect of
dilution of H+ ion concentration of an acid.
Ans: On dilution of an acid solution, the concentration of H+
ion
Decreases per unit volume.
15.
A chemical substance is
used to set the fractured bones in the right position. Give the chemical name
and formula of this substance.
Ans: Plaster of Paris. The
chemical name of the compound is calcium sulphate hemihydrate.
Formula is CaSO4. ½ H2O.
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