A. Alkaline earth metals B. Alkali metals C. Noble gases D. Halogens

A. Very strong B. Very weak C. Weaker D. Stronger

A. A compound B. A mixture of compounds C. A metals D. An elements

A. Ca and Cl B. O C. Both (a) and (b) D. Cl and O

A. C, H and O B. C, N and O C. C, N and H D. C, O, H and N

A. 115 B. 92 C. 23 D. 230

A. Metals and non-metals B. Elements C. Compound D. Mixture

A. 115 B. 23 C. 230 D. 92

A. Metals and non-metals B. Gases and non-gases C. Solids and non-solids D. Solid and liquid

A. Plane of symmetry B. Axis of symmetry C. Center of symmetry D. All