Choose the correct option–


(i) The position of which of the following elements is not fixed in the periodic elements


(a) Sodium (b) Chlorine

(c) Helium (d) Hydrogen


(ii) Elements in Mendeleev's periodic table have been arranged according to–


(a) Increasing order of molecular weight

(b) Increasing order of atomic weight

(c) Increasing order of atomic number

(d) Increasing order of atomic radii


(iii) The modern periodic law was proposed by–


(a) Newlands (b) Moseley

(c) Mendeleev (d) Döbereiner


(iv) On moving down a group, the metallic character–


(a) Neither increases nor decreases (b) decreases

(c) Increases (d) First increases, then decreases


(v) Which of the following depicts increasing atomic sizes of Na, Li, K –


(a) Li<Na<K (b) K<Na<Li

(c) Na<Li<K (d) None of the above