Physical and Chemical Properties of Hydrogen

Q.

The chemical name of laughing gas is ___ .

Q.

How do you know if a half-reaction is oxidation or reduction?

Q.

Loss of electrons is called ______.

1. Can be oxidation or reduction

2. None of these

3. Reduction

4. Oxidation

Q.

Is it possible to liquify atmospheric gases? If yes, suggest a method.

Q.

14. A gas is collected by the upward displacement of air but cannot be collected by downward displacement of water. Identify the probable characteristics of the gas.

1. It is heavier than air and insoluble in water.

2. Its vapor density is equal to air and it is highly soluble in water.

3. It is heavier than air and it is highly soluble in water

4. It is lighter than air and water.

Q.

Why are metals sonorous and non metals are non sonorous?

Q.

Why does the electrolysis of water produce twice as much Hydrogen and Oxygen?

Q. Why is diffused sunlight required for the reaction between hydrogen and chlorine?

1. The bonding between hydrogen and chlorine gas takes place only in the presence diffused sunlight.
2. There will be more pressure
3. There will be less pressure
4. Both A and B

Q.

In water, the mass ratio of hydrogen to oxygen is always 1:8.

1. True

2. False

Q.

Explain the chemical properties of hydrogen

Q.

If same weight of liquid water and piece of ice is taken, then why is density of ice less than that of liquid water?

1. The given statement is wrong.

2. Because ice is a solid

3. Because molecules of ice are closely packed

4. Because vacant spaces are present in crystal lattice of ice.

Q. Give reasons: ​
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.​

Q.

Is it essential that oxidation and reduction must occur side by side in a chemical reaction ? Explain.

Q.

Define the following terms on the basis of electron transfer:

(a) oxidation
(b) reduction
(c) redox reaction
(d) oxidizing agent
(e) reducing agent

Q.

Hydrogen burns with a _________ flame.

Q.

Hydrogen exists in nature in the ______ state at ordinary temperature

1. Gaseous

2. Liquid

3. Solid

4. All the three states

Q.

Helium is preferred instead of hydrogen for filling balloons because it is:

1. Lighter than air

2. Almost as light as hydrogen

3. Non-combustible

4. Inflammable

Q. Zinc reacts with both $HCl$ and $NaOH$ to liberate $H_2$ gas. This proves that $Zn$ is in nature.

1. acidic
2. basic
3. amphoteric

Q.

Why is oxygen collected by the downward displacement of water?

Q.

Whichof the two diffuses slower : nitrogen dioxide into air or copper sulphate into water and why?

Q. As we know water molecules are made up of hydrogen and oxygen.In oxygen material Burns 6 times faster than air and hydrogen is a flammable element then why water does not Burns?

Q.

Write the equation of the reaction taking place at the cathode and when acidified water is hydrolysed?

Q.

Hydrogen is readily adsorbed by nickel, palladium at room temperature. One volume of palladium can adsorb 900 volumes of hydrogen. So if I put finely divided palladium in water, will it adsorb all hydrogen and leave only oxygen? If no, why?

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

Q.

Is xenon poisonous?

Q. Give reasons: ​
Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.​

Q. How did the name hydrogen originate?​

Q. Balloon '$A$' is filled with air and Balloon '$B$' is filled with $H_2$ gas. Which balloon rises high up in the sky?

Q. Hydrogen gas is lighter than air.

1. True
2. False

Q.

$Mn{O}_2+4HCl\to MnC{l}_2+2H_{2}O+C{l}_2$

In the above reaction, Mn is reduced and Cl is oxidised. Such reactions in which both oxidation and reduction takes place is called __________ reaction.

1. Redox

2. Displacement

3. Combination

4. Decompositon