What is the percentage of nitrogen in urea?

Important Questions on Chemical Calculations

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 5

${\mathrm{H}}_2\mathrm{S} \left(\mathrm{g}\right)$ is prepared from $\mathrm{FeS}$ and sulphuric acid. What will be the amount of ${\mathrm{H}}_2\mathrm{S} \left(\mathrm{g}\right)$ when $98 \mathrm{g}$ sulphuric acid Is used ?

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 6

On heating ${\mathrm{PH}}_3$ gas it dissociates into solid phosphorus and ${\mathrm{H}}_2$ gas.$100 \mathrm{mL}$ of ${\mathrm{PH}}_3$ is heated. The volume change in the reaction Is:

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 7

The amount of water formed by the combustion of $16 \mathrm{g}$ methane is:

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 1

The empirical formula of Acetylene is _____.

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 3

Molecular mass of a gas = $\mathrm{n} \times$ _____ formula mass.

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 4

${\mathrm{H}}_2 \left(\mathrm{g}\right)$ reacts with ${\mathrm{N}}_2 \left(\mathrm{g}\right)$ to produce gaseous ammonia. The ratio of their volume is _____.

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 5

$100 \mathrm{g}$ of calcium carbonate produces _____ $\mathrm{L}$ of ${\mathrm{CO}}_2$ at STP.

EASY

10th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 10>Chapter 3 - Chemical Calculations>EXERCISE>Q 6

$40 \mathrm{g}$ $\mathrm{NaOH}$ neutralises _____ $\mathrm{g}$ sulphuric acid completely.