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Punjab (PTB) · Half book test (board pattern) · Free

10th Class Chemistry First half Book Paper

60 marks · About 2 hours (objective and subjective) · 39 questions. Covers: 7 chapters (CHAP 14: STATES OF MATTER AND PHASE CHANGES to CHAP 20: WATER).

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10th Class Chemistry First half Book Paper

10th Class · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 60Time: About 2 hours (objective and subjective)

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. According to the solubility rules, which of these groups of salt are always soluble in water?

    1. All sodium, potassium, and ammonium salts

    2. Barium and lead sulfates

    3. Silver and lead chlorides

    4. All

  2. 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

  3. What happens to the movement of particles when a gas is cooled?

    1. They repel each other more

    2. They disappear

    3. They move faster

    4. Their kinetic energy decreases

  4. Which catalyst is commonly used in the porous carbon electrodes of a fuel cell?

    1. Copper

    2. Zinc

    3. Platinum

    4. Iron

  5. Which two elements are specifically known to increase the risk of certain cancers?

    1. Lead and Mercury

    2. Arsenic and Cadmium

    3. Chromium and Copper

    4. Nitrogen and Phosphorus

  6. Once bound with the reactant molecule, the particular chemical bonds in the reactant molecule are:

    1. Strengthened

    2. Broken completely into ions

    3. Sufficiently weakened

    4. Replaced by metallic bonds

  7. To obtain sulphuric acid of desired concentration, oleum is mixed with an appropriate amount of:

    1. Water

    2. Oxygen

    3. Hydrochloric acid

    4. Alcohol

  8. Where are the smaller sodium ions located in the sodium crystal cube?

    1. At the corners of the cube

    2. At the center of each face

    3. In the edges of the cube

    4. Floating outside the cube

  9. 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

  10. At a given temperature, lighter gases diffuse:

    1. Slower

    2. Slower

    3. At same rate

    4. Not at all

  11. During electrolysis, the molten lead is maintained in a heated crucible above:

    1. 100°C

    2. 300°C

    3. 500°C

    4. 1000°C

  12. Effective management of which resources is required to face future challenges in Pakistan?

    1. Forest resources

    2. Mineral resources

    3. Water resources

    4. Land resources

Q2. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. If 10 g of salt is dissolved in 0.5dm3 of water, what will be its concentration in g/dm3?

  2. Why is fluorine always assigned a -1 oxidation number in binary compounds?

  3. What is the impact of heat on the internal energy of a system?

  4. Does the size of gas molecules affect the molar volume? Why or why not?

  5. Define oxidation in terms of oxygen addition and give one example.

  6. Differentiate between evaporation and boiling.

  7. Write the formula to find the mass of a solute when concentration (g/dm3) and volume are given.

  8. What are noble metals? Give two examples.

Q3. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. How does the frequency of collisions change with an increase in reactant particles per unit volume?

  2. Define the reactivity series of metals.

  3. Which reactants are used to prepare soluble potassium nitrate?

  4. Why does a test tube feel cold when ammonium chloride is dissolved in water?

  5. How do group 1 metals (Na, K) react with cold water?

  6. How is excess amount of the base or the metal remove from the mixture?

  7. Does the total mass of substances change during a chemical reaction?

  8. State the balanced chemical equation for the synthesis of ammonia.

Q4. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. How does potassium fertilizer make plants physically strong?

  2. Which minerals are typically found in tap water?

  3. Why is flood irrigation considered a disadvantageous practice for water management?

  4. How do faulty septic tanks affect nearby water bodies?

  5. Define distilled water.

  6. Name useful and harmful substances present in water.

  7. Why is it dangerous to add micro-nutrients to the soil in large quantities?

  8. How are fertilizers classified based on the elements they provide?

Q5. Long questions (Attempt any 2 of 3 · 2 × 9 = 18)

  1. Write a detailed note on the reactivity series of metals.

  2. Explain the concepts of oxidation and reduction in detail on the basis of addition and removal of oxygen and hydrogen. Support your answer with at least four balanced chemical equations.

  3. How does chemical kinetics play an important role in the food industry?