Chemical Formula

Q.

The chemical formula of lead sulfate is

1. Pb₂SO₄

2. Pb(SO₄)₂

3. PbSO₄

4. Pb₂(SO₄)₃

Q.

In methane, one carbon atom is bonded to ____ hydrogen atoms

1. 1

2. 3
3. 6
4. 4

Q.

Let $X$ and $Y$ be two elements. The formula of a compound made up of $X$ and $Y$ is $X_2{Y}_3$. For a molecule of the compound, the ratio between the Y and X atoms is:

1. X₂Cl

2. XCl₂

3. X₃Cl

4. XCl₃

Q.

The ratio of hydrogen atoms present in one molecule each of methane and ammonia is:

1. AlO₂

2. Al₂O₃

3. Al₃O₂

4. AlO

Q.

The correct representation of the chemical formula of common salt is

1. nacl

2. NaCl

3. NACL

4. NaCL

Q. State two examples in each case and write their chemical formulae: (3 marks)
(i) Molecules having one kind of atoms only.
(ii) Molecules having two different kinds of atoms.
(iii) Molecules having three different kinds of atoms.

Q.

Subscripts in the chemical formula $A_3{B}_8$ denote 3 atoms of A are mixed with 8 atoms of B.

1. is true and B is false.

2. A is false and B is true.

Q.

The total number of atoms in $2C_6{H}_{12}{O}_6$ is:

1. is true and B is false.

2. A is false and B is true.

3. Both A and B are true

4. Both A and B are false

Q.

Complete the statement by filling the blanks with the correct word from the bracket

(5). The ratio of hydrogen and oxygen in water is___________[2:1 /1:2].

Q.

Write the chemical formulae for Chile saltpeter and Nitre.

Q.

what is the chemical formula of salt

Q. Chemical formula of a compound is determined on the basis of __________ of its constituents.

1. number of neutrons
2. valency
3. atomic mass
4. atomic size