Questions
21
Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines ?
Answer: Option [A]
22
In an atom, the order of filling up of the orbitals is governed by
Answer: Option [B]
23
In a dry cell (battery), which of the following are used as electrolytes ?
Answer: Option [D]
25
Consider the following statements: Cook is one of the materials of the charge added to blast furnace for the production of steel / iron. Its function is to
Of these statements
I. act as the reducing agent
II. remove silica associated with the iron ore
III. function as fuel ; to supply heat
IV. act as an oxidizing agent
Answer: Option [C]
26
An aqueous solution of copper sulphate is acidic in nature because the salt undergoes
Answer: Option [B]
27
Which are the materials generally employed as solder in soldering operations in electronics ?
Answer: Option [A]
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