Which elements among the following would not produce hydrogen on treatment with caustic soda?
(i) Zn

(ii) Mg

(iii) AI

(iv) Cu

(v) Sn

Which of the following represent the correct Element and Symbol Pair?

(i) Cobalt –CO

(ii) Copper-Cu

(iii)Potassium- K

(iv) Calcium-C

(v) Silicon-Sl

(vi) Silver- Ag

(vii)Barium-Ba

(viii)Iron-Ir

What are the correct sets of Atomic masses (u) and Elements?

(i) N-14

(ii) Sulphur-34

(iii)Chlorine-36

(iv) Mg-24

(v) Cl-35.5

(vi) Oxygen-8

(vii)Na-23

Question 11
Which of the following metals exist in their native state in nature?
(i) $\text{Cu}$
(ii) $\text{Au}$
(iii) $\text{Zn}$
(iv) $\text{Ag}$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

Question 11
Which of the following metals exist in their native state in nature?
(i) $\text{Cu}$
(ii) $\text{Au}$
(iii) $\text{Zn}$
(iv) $\text{Ag}$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)