Assertion (A): Elements and compounds are pure substances.

Reason (R): Elements and compounds are made up of only one kind of atoms and molecules respectively.

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): Mixtures are impure substances made up of two or more kinds of elements and compounds mixed together in any proportion.

Reason (R): Homogeneous mixtures have a uniform composition throughout their bulk.

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): Metalloids are the elements showing some properties of metals and some properties of non-metals.

Reason (R): Metalloids are hard solids.

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): Chromatography is the latest technique to separate the components of a mixture when all the components are different in their properties.

Reason (R): Components of ink are separated by chromatography.

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.