Question

Acids, Bases and Salts
4. Bases that dissolve in water are called
(a) acids
(b) alkalis
(c) salts
(d) bases
5. The acids produced by plants and animals are called
(a) inorganic acids
(b) mineral acids
(c) organic acids
(d) acetic aid
6. ( If an indicator gives a colour change with an acid, it does not give a colour change with a
base.
(ii) If an indicator changes colour with a base, it does not change colour with an acid.
(ii) Change of colour in an acid and a base depends on the type of the indicator.
(iv) Both acids and bases change colour of all indicators.
Which of these statements are correct?
(a) only (ii)
(b) (i) and (iv)
(c) (i) and (ii)
(d) (i), (ii), (ii) and (iv)
7. "Litmus', a natural dye is an extract of which of the following?
[NCERT Exemplar]
(a) China rose (Gudhal)
(b) Beetroot
(c) Lichen
(d) Blue berries (Jamun)​

Answer 1

Answer:

1. alkali
2. organic acids
3. ) Only (iv) All indicators do not change colour with acids as well as bases, e.g. turmeric changes its colour to pink with base but it remains yellow with acid. ... There are some indicators which changes colour with both acid and base, e.g. methyl orange, litmus, thus statement (ii) and (iii) are also incorrect.
4. lichens.

Explanation:

hope it helps you

Answer 2

Answer:

4) Alkalis

5) Organic Acids

7) Litchen

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