NDA CHEMISTRY QUIZ - 34

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Question 1:

Tools made of brass are known to have extended life and a reduced need for sharpening. The brass tools are made up of -

Question 2:

During smelting, an additional substance is added which combines with impurities to form a fusible product known as

Question 3:

A metal ‘M’ is found in nature as sulphide ore M2S . Which of the following sequence will be suitable for extraction of this metal from its ore M2S?

Question 4:

In general, the number of electrons in the outermost shell of a non metal atom is-

Question 5:

A metal (E) is stored under kerosene. When a small piece of it is left open in the air, it catches fire. The process by which the metal is obtained from its molten chloride is

Question 6:

The metals at the top of the reactivity series be extracted from their ores by

Question 7:

Match List I and List II

Question 8:

The reaction of metal (X) with ferric oxide is highly exothermic. Metal (X) is obtained from its oxides by electrolytic reduction. Identify (X)

Question 9:

Zinc fails to evolve hydrogen gas on reacting with dilute nitric acid because-

Question 10:

An ore on heating in air produces carbon dioxide. Which process would you suggest for its extraction?

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