(b) 
(c) 
(d) 
(e) 
Or
List six physical properties of
acids. How do acids react with metals?
Answer:
(a) 
(1)
(b) 
(1)
(c) 
(1)
(d) 
(e) 
Or
Physical properties of acids
are
(i) Acids have sour taste.
(ii) Acids conduct electricity
in their aqueous solution.
(iii) Acids can change blue
litmus red.
(iv) Acids can make
phenolphthalein colourless.
(v) Acids change colour of
methyl orange to red.
(vi) Acids also act on natural
indicators to change their colour. (3)
Dilute acids react with metals
to liberate hydrogen gas. e.g., (1/2)
Metals which are less reactive
than hydrogen cannot displace it and don't react with acid. e.g., silver,
copper, gold, etc.
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