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# One of the ingredients of the paste on the side of a match box is

 A) Phosphorus pentaoxide B) Phosphorus trichloride C) Phosphorus trisulphide D) Phosphorus trioxide

Answer:   C) Phosphorus trisulphide

Explanation:

The paste applied to the side of a match box is a mixture of phosphorus trisulphide, glass powder (or sand) to cause friction and glue (binding material)

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

Answer & Explanation Answer: B) homogenous, silicates

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

0

The freezing point of water at 760mm pressure is

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

Answer & Explanation Answer: B) 273 K

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

Answer & Explanation Answer: 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