10th Class Chemistry Chapter 2 TestSTOICHIOMETRY

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. What is the first step in identifying a limiting reactant?

   1. Balance the chemical equation

   2. Calculate the number of moles of the reactants

   3. Measure the room temperature

   4. Discard the excess reactant

2. The concept of molar volume helps us to calculate the number of moles of a gas if we know its:

   1. Temperature

   2. Pressure

   3. Volume

   4. Density

3. Titration is a technique used to find the concentration of a solution by reacting it with:

   1. Water only

   2. Solution of known concentration

   3. Insoluble salt

   4. Gaseous catalyst

4. The empirical formula of hydrogen peroxide is:

   1. HO

   2. H₂O

   3. HO₂

   4. H₂O₂

5. The stage in titration where the reaction between two solutions is complete is known as:

   1. Starting point

   2. Mid point

   3. End point

   4. Neutral point

6. If 20g of sodium is dissolved in 0.2dm³ of water, the concentration is:

   1. 10g/dm³

   2. 40g/dm³

   3. 80g/dm³

   4. 100g/dm³

7. If the actual yield of a compound is 0.198g while the theoretical field is 0.217g. What will be the percentage yield?

   1. 50%

   2. 91.2%

   3. 80%

   4. 90%

8. Empirical formula of water is:

   1. H₂O

   2. 2H₂O

   3. H₂O₂

   4. HO

9. The pressure value used for standard RTP conditions is:

   1. 100kpa

   2. 1atm(760 torr)

   3. 273torr

   4. 24atm

10. If 1 mole of glucose produces 6 moles of CO₂, how many moles of CO₂ will be produced by 0.148 moles of glucose?

    1. 0.148mol

    2. 0.888mol

    3. 1.25mol

    4. 6.0mol