Introduction to Hydrogen

Q.

What are electron deficient compounds explain with example?

Q.

The lightest element in the periodic table is

1. Deuterium

2. Helium

3. Hydrogen

4. Lithium

Q.

Do all the metals react with a base? If not, which metals react and why?

Q.

Noble gases do not form any chemical bond.

1. False

2. True

Q.

Number of valence electron in hydrogen atom is ___ .

1. 1

2. 2

3. 3

4. 7

Q. Which of the following is/are true regarding isotopes?

1. Same number of protons
2. Different number of electrons
3. Same number of neutrons
4. Different number of neutrons

Q.

The position of hydrogen in the modern periodic table is not fixed.

1. True

2. False

Q.

Name the following:
A metal which reacts with dilute nitric acid to liberate hydrogen gas.

Q.

Give two examples to show the reducing property of hydrogen. Illustrate using equations.

Q.

Which one of the following metals does not react with cold as well as hot water?

1. $\mathrm{Na}$

2. $\mathrm{Ca}$

3. $\mathrm{Mg}$

4. $\mathrm{Fe}$

Q.

What is the efficiency of a Fuel cell?

Q.

Why is Helium so unreactive ?

Q.

Which of the following is the most abundant element in the universe?

1. Helium

2. Oxygen

3. Hydrogen

4. Nitrogen

Q.

Phosphorus is a polyatomic molecule.

1. True
2. False

Q.

What is the other name of the oxygen family?

Q.

Hydrogen has _____ valence electrons.

1. one
2. two
3. four
4. three

Q.

How is valency of an element found?

What is the formula of finding valency

Q.

Properties of hydrogen resembles from elements of following groups:

1. Noble gas, Alkali metals

2. Alkaline earth metals, Halogens

3. Alkali metals, Alkaline earth metals

4. Alkali metals, Halogens

Q.

What percentage of the matter in the universe consists of hydrogen?

1. 50%

2. 20%

3. 90%

4. 74%

Q.

Who is regarded as father of modern chemistry?

Q.

Hydrogen in its molecular forms exists as ________ gas.

1. polyatomic

2. diatomic

3. tetra-atomic

4. triatomic

Q.

When sodium metal is added to water, it gets

1. reduced

2. oxidised

3. hydrolysed

4. remains unchanged

Q.

Nickel reacts with cold water to form nickel oxide and releases hydrogen gas.

1. True
2. False

Q.

Number of valence electron in hydrogen atom is ___ .

1. 7

2. 3

3. 1

4. 2

Q.

Consider the following statements about an element ‘X’ with a number of protons 13.

(A) It forms an amphoteric oxide

(B) Its valency is three

(C) The formula of its chloride is ${\mathrm{XCl}}_3$

The correct statements(s) is/are

1. only (A)

2. only (B)

3. (A) and (C)

4. (A), (B) and (C)

Q.

What % of matter in universe consists of hydrogen?

1. 55%

2. 22%

3. 79%

4. 74%

Q.

The colour of hydrogen gas is pink. True / False

1. True
2. False

Q.

Properties of Hydrogen resembles from which of the following elements

1. Sodium

2. Aluminium

3. Chlorine

4. Fluorine

Q.

Hydrogen in Latin means water generating.

1. True
2. False

Q.

Oxygen gas is _________ in nature.

1. acidic

2. basic

3. neutral

4. all of these