Glucose reacts with concentrated sulphuric acid to give a very pure form of carbon called sugar charcoal.

The reaction taking place is:

1. oxidation
2. combustion
3. dehydration
4. combination

In which of the following electrolytic cells [P, Q, R or S] will silver plating be done on the spoon?

1. P
2. Q
3. R
4. S

A ⟶ A⁺³; B ⟶ B^-1
Number of electrons present in the outermost shell of atoms A and B respectively are:

1. 5, 1
2. 3, 1
3. 3, 7
4. 5, 7

A …………… solution is observed after placing Magnesium metal in a solution of Copper sulphate for half an hour.

1. Blue
2. Colourless
3. Reddish brown
4. Dirty green