Duralumin is an alloy with composition:

P — Al and Mg

Q — Al, Cu and Mg

R — Al and Mn

1. Only P

2. Only Q

3. Both P and R

4. Only R

Assertion (A): Hydrogen is a non-metal and can even form positive ions.

Reason (R): Metals are defined as the elements which form positive ions by the loss of electrons.

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.

Assertion (A): Minerals are the substances from which metals can be extracted profitably.

Reason (R): Ores are those minerals from which metals are extracted commercially and profitably.

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.

Assertion (A): Aluminium is extracted from its ore bauxite.

Reason (R): Bauxite is the only ore of aluminium.

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.