NaOH is not used in

Study the given experimental set-up and answer any four questions from (i) to (v) given below. What will happen if NaOH is used in place of dil. sulphuric acid and the test tube is heated ?

Why NaOH cannot be used to separate Al(OH)_(3) and Zn(OH)_(3) ?

Can NaOH be used in place of NH_4OH to precipitate the cations of group III in qualitative analysis?

Give reasons (ii) A mixture of Al pieces and dilute NaOH is used to open drains

4g of NaOH is dissolved in water and the volume is made upto 1 L. (1 mole of NaOH = 40 g) How will you make 1 M solution of NaOH using the same amount (4g) of NaOH?