CDS II 2018 General Knowledge Previous Year Paper (18-Nov-2018)

Question 1

Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be ________.

Accepted Answer

Magnesium carbonate and hydrochloric acid

Answer

Zinc and hydrochloric acid

Answer

Methane and oxygen

Answer

Copper and dilute hydrochloric acid

Question 2

How many moles of CO can be obtained by reacting 2.0 mole of CH 4, with 2.0 mole of O 2, according to the equation given below?$C{H_4}\left( g \right) + \frac{1}{2}{O_2} \to CO + 2{H_2}$

Accepted Answer

2.0

Answer

0.5

Answer

2.5

Answer

4.0

Question 3

Reaction between which of the following two reactants will produce hydrogen gas?

Accepted Answer

Magnesium and hydrochloric acid

Answer

Copper and dilute nitric acid

Answer

Calcium carbonate and hydrochloric acid

Answer

Zinc and Nitric acid

Question 4

Which of the following characteristics is common to hydrogen, nitrogen, oxygen and carbon dioxide?

Accepted Answer

They are all gases at room temperature.

Answer

They are all diatomic.

Answer

They are all colored.

Answer

They all have same reactivity.

Question 5

The compound C 7H 7NO 2 has ________.

Accepted Answer

17 atoms in a molecule of the compound

Answer

equal molecules of C and H by mass

Answer

twice the mass of oxygen atoms compared to nitrogen atoms

Answer

twice the mass of nitrogen atoms compared to hydrogen atoms

CDS II 2018 General Knowledge Previous Year Paper (18-Nov-2018)

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