Solutions of worksheet 1, Ch 5, Class 7

Answer 1:
(a) litmus, lichens
(b) Base
(c) Indicator
(d) Indicator
(e) Acid
(f) Neutral
(g) Natural
(h) produced or evolved
(i) acidic,basic or neutral
(j) Magnesium hydroxide,Sodium bicarbonate
(k) acidic, basic
(l) add acid to water.

Answer 2:
(d) Baking soda

Answer 3:
(d)

Answer 4:
(d)

Answer 5:
(c)

Answer 6:
(c)

Answer 7:
Litmus/china rose/turmeric

Answer 8:
Acid turns red litmus paper into blue and base turns blue litmus into red

Answer 9:
Neutral substances

Answer 10:
citric acid