Ionic Compounds Chemical Formula

Q.

Write the chemical formula of the following compound:

Sodium arsenite.

Q.

The ionic compound containing ${Fe}^{3+}$ and $(S{O}_4{)}^{2-}$ would have the formula

1. 

2. 

3. 

4. 

Q. Formula for sodium carbonate is:

1. $NaC{O}_2$
2. ${Na}_{2}C{O}_3$
3. ${Na}_{3}C{O}_2$
4. $NaC{O}_3$

Q.

X is an ionic compound containing only magnesium, aluminium and oxygen. Which of the following can be the formula of X?

1. ${Mg}_{4}Al{O}_2$

2. ${Mg}_{2}Al{O}_4$

3. $MgAl{O}_4$

4. $Mg{Al}_2{O}_4$

Q. What are polyatomic ions? Give examples.
[3 Marks]

Q. Identify the correct formula for the compound ferric sulphate.

1. $\text{Fe}{\text{SO}}_4$
2. ${\text{Fe}}_2\text{(}{SO}_4{)}_3$
3. ${\text{Fe}}_3\text{(}{SO}_4{)}_3$
4. ${\text{Fe}}_3\text{(}{SO}_4{)}_2$

Q.

Which of the following chemical formula is correct?

1. $Na{Cl}_2$
2. $KCl$
3. $K{Cl}_4$
4. $Na{Cl}_3$

Q. How many ammonium ions are present in ammonium sulphate?

1. 1
2. 3
3. 4
4. 2

Q. What is the chemical symbol for molybdenum?

1. Mi
2. Mo
3. Mb
4. My

Q.

Formula for sodium carbonate is:

1. NaCO₂

2. na₂CO₃

3. Na₂CO₃

4. Na₃CO₂

Q. Which of the following represents the chemical formula of calcium carbonate?

1. $Ca({CO}_3{)}_2$
2. $Ca{CO}_3$
3. ${Ca}_2{CO}_3$​
4. ${Ca}_{3}C{O}_2$​

Q. What is the chemical formula of aluminium chloride?

1. $AlC{l}_3$
2. $AlC{l}_2$
3. $A{l}_{2}C{l}_3$
4. $AlCl$

Q. What is the chemical formula of ammonium chloride?

1. ${\text{NH}}_3\text{Cl}$
2. ${\text{NH}}_4\text{Cl}$
3. $\text{NH}\text{Cl}$
4. ${\text{NHCl}}_4$

Q. Magnesium chloride is an ionic compound formed by magnesium and chloride ions. The overall charge on its molecule will be _____.

1. -1
2. 1
3. + 2
4. 0

Q.

What is the abbreviation for an element called?

1. Symbol

2. Short

3. Version

4. Other

Q.

Statement 1: An atom of valency 2 can combine with 2 other atoms of valency 1.
Statement 2: To write the chemical formula, one must know the valency of the element.

1. Both the statements are true and 2 is the right explanation of 1.

2. Both the statements are true and 2 is not the right explanation of 1

3. Only statement 1 is true
4. Only statement 2 is true