Properties of Hydrogen

Which of the following statements about hydrogen is incorrect?

A metal oxide that is reduced by hydrogen is

Helium is preferred to hydrogen for filling balloons because it is:

The composition of the nucleus of deuterium is

Which metal adsorbs hydrogen?

Give reason, a candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

When hydrogen is passed over a black solid compound $\mathrm{A}$, the products are a colourless liquid and a reddish brown metal $\mathrm{B}$. Substance $\mathrm{B}$ is divided into two parts, each placed in separate test tubes. Dilute $\mathrm{HCl}$ is added to one part of substance $\mathrm{B}$ and dilute ${\mathrm{HNO}}_3$ to the other. Is there any reaction between substance $\mathrm{B}$ and dilute hydrochloric acid? Give reasons for the your answer.

When hydrogen is passed over a black solid compound $\mathrm{A}$, the products are a colourless liquid and a reddish brown metal $\mathrm{B}$. Substance $\mathrm{B}$ is divided into two parts, each placed in separate test tubes. Dilute $\mathrm{HCl}$ is added to one part of substance $\mathrm{B}$ and dilute ${\mathrm{HNO}}_3$ to the other. Write an equation for the reaction between hydrogen and substance $\mathrm{A}$.

When hydrogen is passed over a black solid compound $\mathrm{A}$, the products are a colourless liquid and a reddish brown metal $\mathrm{B}$. Substance $\mathrm{B}$ is divided into two parts, each placed in separate test tubes. Dilute $\mathrm{HCl}$ is added to one part of substance $\mathrm{B}$ and dilute ${\mathrm{HNO}}_3$ to the other. What happens to the substance $\mathrm{A}$ when it reacts with hydrogen? Give reasons for your answer.

When hydrogen is passed over a black solid compound $\mathrm{A}$, the products are a colourless liquid and a reddish brown metal $\mathrm{B}$. Substance $\mathrm{B}$ is divided into two parts, each placed in separate test tubes. Dilute $\mathrm{HCl}$ is added to one part of substance $\mathrm{B}$ and dilute ${\mathrm{HNO}}_3$ to the other. Give two test for the colourless liquid formed in the experiment.

When hydrogen is passed over a black solid compound $\mathrm{A}$, the products are a colourless liquid and a reddish brown metal $\mathrm{B}$. Substance $\mathrm{B}$ is divided into two parts, each placed in separate test tubes. Dilute $\mathrm{HCl}$ is added to one part of substance $\mathrm{B}$ and dilute ${\mathrm{HNO}}_3$ to the other. Name the substance $\mathrm{A}$ and $\mathrm{B}$.

Under what condition hydrogen be made to combine with oxygen? Name the product and write the equation.

Under what condition hydrogen be made to combine with sulphur? Name the product and write the equation.

Under what condition hydrogen be made to combine with chlorine? Name the product and write the equation.

Under what condition hydrogen be made to combine with nitrogen? Name the product and write the equation.

What do you observe when hydrogen gas is passed through soap solution?

If hydrogen and magnetic oxide of iron are kept in closed vessels at over $400°\mathrm{C}$, what would happen to them?