State Mendeleev's Periodic Law.

If an element $X$ is placed in group $14$,what will be the formula and the nature of bonding of its chloride?

Describe the basic character of the oxides of third period elements across the period from left to right.

Which of the following elements will form an acidic oxide?

Which of the following sets of elements is written in the order of their increasing metallic character?

Properties of the elements are given below. Where would you locate the following elements in the periodic table?
$(a)$ $A$ soft metal stored under kerosene.
$(b)$ An element with variable (more than one) valency stored under water.
$(c)$ An element which is tetravalent and forms the basis of organic chemistry.