Introduction to Hydrogen

Q.

Calculate the mass of an atom of silver (Atomic mass = 108).

Q. Fist 20elements with their atomic masses and valency

Q.

Molecular mass of hydrogen ($H_2$) is___u.

Q.

Calculate the molecular masses of H₂.

Q.

Calculate the molecular mass of (a) Sodium Sulphate

Q.

The reason why balloons are filled with helium instead of hydrogen is:-

1. Hydrogen is toxic

2. Hydrogen is lighter than helium

3. Hydrogen is flammable

4. Hydrogen escapes from the balloon quickly

Q.

Which group does Hydrogen belong to?

1. Group 14, along with Carbon etc

2. Although Hydrogen has similarities with Alkali metals, and group 17 atoms, it is best positioned separately

3. S-Block, Group 1

4. Group 17 along with Halogens

Q.

Why only helium is filled in balloons??

Hydrogen and nitrogen are also light in weight.then why we don't use these gases??

Q.

Which compound has highest covalent character?

1. LiCl

2. Lil

3. LiF

4. LiBr

Q.

Atomic mass of hydrogen ($H$) is___u.

Q.

Calculate the molecular mass of Potassium nitrate $\left({\mathrm{KNO}}_3\right)$

Given Atomic masses: K = 39u, N = 14u, O = 16u

Q. ________ needs three electrons to attain the nearest noble gas configuration.

1. Oxygen
2. Nitrogen
3. Silicon
4. Helium

Q. Hydrogen exists in three isotopic forms, ${{}^{}}_1{H}^1$, ${}_1{H^2}^{}$ , ${}_1{H}^3$ known as protium, deuterium, and tritium. Why are all the isotopes neutral in nature?

1. Since neutrons are neutral in nature, hence isotopes are electrically neutral.
2. Increasing the number of protons in the isotopes makes them neutral.
3. All the isotopes have one proton and one neutron, hence they are neutral.
4. All the isotopes have one electron and one proton, hence they are neutral.

Q.

Oxidation can be defined as the chemical process which involves:-

1. Addition of Oxygen

2. Removal of Hydrogen

3. Addition of Electrons

4. Removal of Electrons

Q.

How many moles of oxygen are present in 18 gms Water?

1. 4

2. 2

3. 1

4. 5

Q.

The mass of an atom of hydrogen is equivalent to 1-12th the mass of a _____ atom

Q.

What is group 5A called?

Q. The period that contains only gaseous elements is the ____ period

1. third
2. second
3. firth
4. frist

Q.

What is a metalloid in Group 13?

Q. What is the valency of an element that has atomic number $19$?

1. $1$
2. $2$
3. $8$
4. $9$

Q. Atomic mass of hydrogen is 1.008 or 1.0008?

Q.

Why is hydrogen said to have dual nature?

Q. If atoms are not able to exist independently, what about argon (Ar), helium (He) ; it made of 1 atom only right? So therefore how thats able to exist?
And hydrogen (H2) , is made of 2 atoms right? So why hydrogen is not able to exist independently?

Q. Hydrogen is similar to halogens as it forms a molecule.

1. diatomic
2. monoatomic
3. triatomic

Q.

Atomic mass of $\mathrm{Gold}\left(\mathrm{Au}\right)$ is $197$u. How many moles of $\mathrm{Gold}$ are present in an Ornament Containing $88.65\mathrm{g}$ of $\mathrm{Gold}$.

Q.

What is Variable Valency? Do elements exhibit variable valencies? Give examples. [3 MARKS]

Q.

Calculate the molecular mass of Sulphuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$.

Given Atomic masses: H = 1u, S = 32u, 0 = 16u

Q.

(a) State the position of hyrogen in the periodic table.

(b) Explain its resemblance to the other members of its group.

Q.

Give the general group study of hydrogen with reference to

(i) valence electrons (ii) burning

(iii) reducing power.

Q.

Give two examples of Monoatomic elements