State whether the following statements are true or false. Correct the false statements.
State whether the following statements are true or false. Correct the false statements.
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red.
(c) Lime water turns red litmus blue.
(d) Common salt dissolved in water turns blue litmus red.
(e) Phenolphthalein is a natural indicator.
(f) Calamine can be used to treat ant’s sting.
(g) Lemon water is basic in nature.
3 Answers
(a) False. Substances can be neutral as well.
(b) False. Acids do not turn all indicators red.
(c) True
(d) False. It does not change the colour of litmus at all.
(e) False. It is a man-made indicator.
(f) True
(g) False. It is acidic in nature.
(i) False: Apart from good quality seeds, using appropriate agricultural practices are important for getting higher yield.
(ii) False: It actually enriches the soil.
(iii) False: Some crop plants need transplantation.
(iv) False: Rhizobium (bacteria) present in the cells of root nodules of leguminous, plants fix nitrogen.
(v) True.
(i) True
(ii) False (Plants of a particular area are collectively termed as fauna).
(iii) False (Deforestation leads to an increase in the water holding capacity of the soil).
(iv) True.