Q11 of 65 Page 18

Which of the following metals exist in their native state in nature?

(i) Cu


(ii) Au


(iii) Zn


(iv) Ag

Gold (Au) and silver (Ag) are not reactive or very less reactive. These metals are called noble metals. Thus, these are placed at the bottom of the reactivity series. Since gold and silver are least reactive of all the metals, these are found in free state in nature.

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9

Which of the following are not ionic compounds?

(i) KCl


(ii) HCl


(iii) CCl4


(iv) NaCl

 10

Which one of the following properties is not generally exhibited by ionic compounds?

 12

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) Au


(ii) Cu


(iii) Na


(iv) K

 13

Silver articles become black on prolonged exposure to air. This is due to the formation of