. Select the correct answers


:

(a) Colour of an aqueous solution of copper sulphate is

(i) Green (ii) Brown

(iii) Blue (iv) Yellow

(b) Colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is

(i) White (ii) Brown

(iii) Green (iv) Pale blue

(c) A metal which produces hydrogen on reacting with alkali as well as with acid.

(i) Iron (ii) Magnesium

(iii) Zinc (iv) Copper

(d) The salt solution which does not react with ammonium hydroxide is

(i) Calcium nitrate (ii) Zinc nitrate

(iii) Lead nitrate (iv) Copper nitrate

 

Best Answer

(a) (iii)

Aqueous solution of copper sulphate is blue.

(b) (iii)

 FeSO4 + 2NaOH → Fe(OH)+ Na2SO4

  (Dirty green, (Colourless)

  gelatinous ppt.)

(c) (iii)

 Zn + 2NaOH → Na2ZnO2 + H2

 Sodium zincate

   (Colourless)

Zz Zn + HCl → ZnCl2 + H2

(d) Option (a)

The salt solution which does not react with ammonium hydroxide is calcium nitrate.

 

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