Class 9 The Language of Chemistry Mock Test (ICSE)

Topics in The Language of Chemistry

• Symbols and valency
• Radicals and writing formulae
• Chemical equations and balancing
• Atomic mass and molecular mass
• Percentage composition

The Language of Chemistry practice questions with answers

1. Q1Multiple choice·1 mark
   What is the correct chemical formula for calcium phosphate?

   1. (a)$\text{Ca}_2(\text{PO}_4)_3$
   2. (b)$\text{Ca}_3\text{PO}_4$
   3. (c)$\text{CaPO}_4$
   4. (d)$\text{Ca}_3(\text{PO}_4)_2$
   Show answer and step marks

   1. Correct option: (d) $\text{Ca}_3(\text{PO}_4)_2$+1

   Answer: (d)
2. Q2Multiple choice·1 mark
   What is the relative molecular mass of calcium carbonate ($\text{CaCO}_3$)? [Given atomic masses: $\text{Ca} = 40$, $\text{C} = 12$, $\text{O} = 16$]

   1. (a)$68$
   2. (b)$52$
   3. (c)$100$
   4. (d)$84$
   Show answer and step marks

   1. Correct option: (c) $100$+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   The percentage of oxygen in carbon dioxide ($\text{CO}_2$) is: [Atomic masses: $\text{C} = 12$, $\text{O} = 16$]

   1. (a)$27.27\%$
   2. (b)$50.00\%$
   3. (c)$72.73\%$
   4. (d)$32.00\%$
   Show answer and step marks

   1. Correct option: (c) $72.73\%$+1

   Answer: (c)
4. Q4Multiple choice·1 mark
   Which of the following elements exhibits variable valency?

   1. (a)Fluorine
   2. (b)Iron
   3. (c)Sodium
   4. (d)Aluminium
   Show answer and step marks

   1. Correct option: (b) Iron+1

   Answer: (b)
5. Q5Short answer·2 marks
   Balance the following chemical equation: $\text{Fe} + \text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2$
   Show answer and step marks

   1. Fe: $1$ on the left, $3$ in $\text{Fe}_3\text{O}_4$, so write $3\text{Fe}$; O: $4$ in $\text{Fe}_3\text{O}_4$, so write $4\text{H}_2\text{O}$.+1
   2. H: $8$ on the left, so write $4\text{H}_2$: $3\text{Fe} + 4\text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + 4\text{H}_2$+1

   Answer: $3\text{Fe} + 4\text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + 4\text{H}_2$
6. Q6Short answer·2 marks
   Balance the following chemical equation: $\text{Pb}(\text{NO}_3)_2 \rightarrow \text{PbO} + \text{NO}_2 + \text{O}_2$
   Show answer and step marks

   1. Balance N with $2\text{NO}_2$: $\text{Pb}(\text{NO}_3)_2 \rightarrow \text{PbO} + 2\text{NO}_2 + \text{O}_2$ leaves O at $6$ on the left and $1 + 4 + 2 = 7$ on the right.+1
   2. Double the lead nitrate, lead oxide and nitrogen dioxide: $2\text{Pb}(\text{NO}_3)_2 \rightarrow 2\text{PbO} + 4\text{NO}_2 + \text{O}_2$ (O: $12 = 2 + 8 + 2$).+1

   Answer: $2\text{Pb}(\text{NO}_3)_2 \rightarrow 2\text{PbO} + 4\text{NO}_2 + \text{O}_2$

More Class 9 Chemistry mock tests