The colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is:

1. White
2. Brown
3. Green
4. Pale blue

A metal which produces hydrogen on reacting with alkali as well as with acid:

1. Iron
2. Magnesium
3. Zinc
4. Copper

Which of the following is the best reagent to distinguish lead nitrate and zinc nitrate ?

P NaOH solution

Q KOH solution

R NH₄OH solution

1. Only P

2. Only R

3. Only Q

4. Both P and Q

Assertion (A): Calcium salt solution does not show any change even after adding an excess of ammonia solution to it.

Reason (R): The low concentration of hydroxide ion in ammonium hydroxide solution which are unable to precipitate the hydroxide ions of calcium

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.