Question

(d) acid
4. Alum is used for
(a) removing hardness of water
(b) purification of water
(c) killing germs present in water
(d) all of these
5. Which of these is not an indicator?
(a) Turmeric (b) Red cabbage
(c) Litmus solution (d) Acetic acid
6. Which of the following is not a base?
(a) sodium hydroxide
(b) magnesium hydroxide
(c) copper carbonate
(d) ammonium hydroxide
7. The common name of sodium hydroxide is
(a) washing soda (b) baking soda
(c) phitkari (d) blue vitriol​

Answer 1

Answer:

alum is used for killing germ , acetic acid is not a indicator, copper carbonate is not a base, the common name of naoh is baking soda