Question

Q1. Multiple Choice Questions: [5]

1. A metal that is solid at room temperature

a.) Sodium b.) Mercury c.) Zinc d.) Iron

2. Metals are

a.) sonorous b.) non-sonorous c.) non-ductile d.) gases

3. Father of modern chemistry

a.) Henry b.) Dalton c.) Lavoisier d.) Priestly

4. Hydrogen means

a.) water lover b.) water maker c.) solid d.) burner

5. Pipette is used for

a.) holding liquids b.) heating liquids c.) storing liquids d.) transferring liquids

Q2. Fill in the blanks: [5]

1. The insoluble solid left on the filter paper is called ___________

2. The symbol for Tungsten is ______

3. ___________ involves rotating a solution at a high speed.

4. In centrifugation the suspended particles collect as ____________

5. ___________ is used to separate solid components of different sizes in a mixture.

Q3. State True or False: [5]

1. Beaker is used for keeping small amounts of liquids.

2. Scuba divers use Dalton’s principles.

3. Pure substances are homogenous.

4. Atom is destructible.5. Hydrogen is a gas that is not inflammable.

Q4. Write the correct formula of the following: [5]

1. Lead Sulphide

2. Magnesium oxide

3. Copper oxide

4. Sodium bicarbonate

5. Sulphur trioxide

Q5. Name the scientists related to the following statements [5]

1. He was the Pioneer in the manipulation of gases

2. He stated that atoms of an element are alike but atoms of different elements are different

3. He showed that the mass of products in a reaction are equal to the mass of the reactants.

4. He developed a vaccine for rabies and anthrax

5. He was the first person to dissolve CO2 in water.

Q6. Choose the correct option: [5]

1. Noble gas (Neon/ Silicon)

2. A highly reactive greenish yellow gas (Nitrogen dioxide/ Chlorine)

3. Ammonia gas is (tetratomic/triatomic)

4. Krypton is (diatomic/monoatomic)

5. Compound that absorbs moisture from air (Sodium chloride/Zinc chloride)Q8. Give two points to show that air is a mixture. [2]

Q9. State any 3 differences between Compounds and Mixtures. [3]​

Answer 1

Answer:

1) Iron

2) sonorous

3) Dalton

4) water maker

5) transferring liquids

1. Precipitate

2.W

3. Centrifugation

4.Pellet

5.sieving

1.True

2.True

3.True

4.True

5.False

Explanation: