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Punjab (PTB) · Chapter test · Free

9th Class Chemistry Chapter 4 TestStoichometry

30 marks · 40 minutes · 21 questions. Covers: CHAP 4: Stoichometry.

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9th Class Chemistry Chapter 4 Test

9th Class · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

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

  1. Calcium carries charge:

  2. How many atomic mass units (amu) are there in one gram?

  3. The negative charged ions are called:

    1. Cation

    2. Anion

    3. Free radical

    4. None of these

  4. For which compound n is equal to unity?

    1. H2O

    2. C6H6

    3. H2O2

    4. Both a and c

  5. 1 gram atom of carbon contains how many moles?

    1. 2 moles

    2. 12 moles

    3. 1 mole

    4. 6 moles

  6. A mole of a substance is its:

  7. How many atoms are present in one gram of H2O?

    1. atoms

    2. atoms

    3.  atoms

    4.  atoms

  8. Which one of the following pairs has the same mass?

    1. 1 mole of CO and 1 mole of N2

    2. 1 mole of CO and 1 mole of CO2

    3. 1 mole of O2 and 1 mole of N2

    4. 1 mole of O2 and 1 mole of CO2

  9. What is the mass of 4 moles of hydrogen gas?

  10. Formula of ozone is:

    1. O2

    2. O3

    3. S8

    4. CO2

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Write down the chemical formulas of the following compounds: Calcium phosphate, Aluminium nitride, Sodium acetate, Ammoniun carbonate and Bismuth sulphate.

  2. Write 4 steps to write a chemical equation?

  3. What are the significance of Avogadro's number?

  4. Define Stoichiometry.

  5. Write importance of chemical equation?

  6. Write down the chemical formula of barium nitride.

  7. What is the molar mass of MgCO2?

  8. What is Avogadro's number?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Which conditions must be fulfilled before writing a chemical equation for a reaction?

  2. How many moles of coal are needed to produce 10 moles of CO according to the following equation?

  3. It is generally believed that drinking eight glasses of water every day is required to keep oneself hydrated especially in the summer. If a glass occupies 400 cm3 of water on the average, how many moles of water are needed for a single adult?