1

# If people sleep in closed rooms where charcoal fire is burning , they die due to

 A) carbon monoxide B) carbon dioxide C) methane D) phosgene

Explanation:

A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.

Subject: Chemistry

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• Related Questions

Glass is a.........mixture of metallic...........

 A) homogenous, sulphates B) homogenous, silicates C) heterogenous, carbonates D) heterogenous, nitrates

Explanation:

Subject: Chemistry

0

The pH of pure water is nearly 7.It will increase on the addition of

 A) ammonia B) cane sugar C) common salt D) hydrochloric acid

Explanation:

Ammonia is a base. One adding ammonia to water,the resulting solution will become basic. pH of an alkaline solution is 7. So the pH will increase

Subject: Chemistry

1

The freezing point of water at 760mm pressure is

 A) 0 K B) 273 K C) 273 C D) -273 C

Explanation:

K is degree kelvin

Zero K corresponds to -273  K = C + 273

The freezing point of water being 0 C, on the kelvin scale it is 0 C + 273 K

Subject: Chemistry

0

The Kinetic energy of gas molecules

 A) is unaffected by temperature variations B) decreases with increase of temperature C) increases with decrease of temperature D) increases with increase of temperature

Explanation:

Kinetic Energy $\inline \fn_jvn KE=\frac{1}{2}mv^{2}$ or $\inline \fn_jvn KE\alpha v^{2}$, Where 'm' is the mass and 'v' is the velocity of molecules.

Velocity is proportional to temperature. Hence, KE is proportional to temperature and would increase with temperature.

Subject: Chemistry

13

Which of the following processes is used to remove reducible oxides from the metal?

 A) liquation B) cupellation C) poling D) electro refining