Occurences

Q.

Valency of hydrogen atom is:-

1. -1

2. +1 or -1

3. +2

4. +1

Q.

What is the valency of the element?

Q.

What is a diatomic molecule?

Q.

Choose the correct statement(s).

1. Protium is the lightest isotope of hydrogen

2. Deuterium is heavier than tritium.

3. Protium is heavier than deuterium.

4. Tritium is heavier than protium.

Q.

Which of the following is the lightest element among the following elements?

1. Helium

2. Deuterium

3. Protium

4. Lithium

Q.

An element has atomic number 16, its valency is -2

1. True
2. False

Q.

Which isotope of oxygen has more number of protons: ${}_8{}^{16}\mathrm{O}$, ${}_8{}^{17}\mathrm{O}$, ${}_8{}^{18}\mathrm{O}$

1. ${}_8{}^{16}\mathrm{O}$

2. ${}_8{}^{17}\mathrm{O}$

3. ${}_8{}^{18}\mathrm{O}$

4. All of these

Q. Name a metal that does not corrode in air.

Q.

Hydrogen is the characteristic constituent of :-

1. Sugar

2. Sulphuric acid

3. Nitric acid

4. Aluminium sulphate

Q.

What do you mean by valency?

Q.

Identify the diatomic molecules from the following?

Hydrogen, Sulfur, Phosphorous, Chlorine, Ozone, Iodine

Q. When a piece of aluminium is dropped in $HCl$ and in $NaOH$ separately, and a burning match is brought near them, pop sound is heard in case of .

1. only HCl
2. only NaOH
3. both HCl and NaOH

Q. Which isotope of hydrogen is radioactive?

Q.

Hydrogen in its molecular forms exists as ________ gas.

1. polyatomic

2. diatomic

3. triatomic

4. tetra-atomic

Q.

Total number of isotopes of hydrogen:-

1. 3

2. 1

3. 2

4. 0

Q. is not an isotope of hydrogen.

1. Protium
2. Deuterium
3. Tritium
4. Hydronium

Q. Which of the following statements is incorrect regarding hydrogen gas?

1. It is the lightest known gas.
2. It is a colourless and odourless gas.
3. It is highly soluble in water.
4. It is non-toxic.

Q. Arrange the following metals in the increasing order of their reactivity with water.

1. Sodium
2. Aluminium
3. Iron
4. Gold

Q.

Which is the most common isotope of hydrogen?

1. Deuterium

2. Tritium

3. Hydronium

4. Protium

Q. Which of the following elements has an isotope that does not have a neutron in its nucleus?

1. Hydrogen
2. Beryllium
3. Helium
4. Magnesium

Q.

What is half life(radioactive elements)?

Q.

The number of neutrons in a $H_1^3$

1. 3

2. 2

3. 1

4. none of these

Q.

Hydrogen in its molecular forms exists as ________ gas.

1. Tetra-atomic

2. Triatomic

3. Diatomic

4. Polyatomic

Q.

Which is not an isotope of hydrogen?

1. Deuterium

2. Protium

3. Hydronium

4. Tritium