Which of the following metals cannot be obtained from their compounds by heating with carbon?

Sodium (Na)

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Potassium (K)

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Zinc (Zn)

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Copper (Cu)

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Solution

The correct options are
A
Sodium (Na)

B
Potassium (K)

The metals high up in the reactivity series (Na, Mg, Ca, Al) are very reactive. They cannot be obtained from their ores by heating with carbon. This is because they have more affinity towards oxygen as compared to carbon. Hence, these metals are obtained by electrolytic reduction.

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Similar questions

Q. Which of the following metals cannot be obtained from their compounds by heating with carbon?

The metals like Na, K, Ca, Al cannot be obtained from their compounds by heating with carbon because their metals have more affinity for oxygen than carbon.

The two metals which can be extracted just by heating their sulphides in the air are:
(a) sodium and copper (b) copper and aluminium
(c) potassium and zinc (d) mercury and copper

Which of the following metals can be obtained from haematite ore?
(a) copper (b) sodium (c) zinc (d) iron

Q. State True or False:
Metals like Na, K, Ca, Al cannot be obtained from their compounds by heating with carbon because their metals have a higher affinity for oxygen than they do for carbon.

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