• Elements, Compounds and Mixtures - 1
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Elements, Compounds and Mixtures - 1

Description: Elements, Compounds and Mixtures - 1
Number of Questions: 20
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Tags: Elements Compounds and Mixtures - 1 Is Matter Around us Pure Element Physical Properties Displayed by Metals Physical Properties Displayed by Non Metals Metalloids Compounds, Characteristics of Compounds Mixture , Characteristics of Mixture Types of Mixtures, Homogeneous Mixtures, Heterogeneous Mixture
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Which of the following occurs in a free state?

  1. Krypton

  2. Germanium

  3. Hydrogen

  4. Lead

Show answer
Correct Option: A
Explanation:

Krypton is the answer as it is a noble gas.

Which of the following does not have lustre?

  1. Potassium

  2. Lead

  3. Phosphorus

  4. Copper

Show answer
Correct Option: C
Explanation:

Phosphorus as it is a non-metal.

Which of the following is not a characteristic of a pure substance?

  1. It should be essentially homogeneous.

  2. It should have the same composition.

  3. It should consist of only elements.

  4. It should have the same properties.

Show answer
Correct Option: C
Explanation:

A pure substance can either be an element or a compound.

Which of the following elements is malleable and ductile?

  1. Potassium

  2. Sulphur

  3. Antimony

  4. Neon

Show answer
Correct Option: A
Explanation:

Potassium is the answer because potassium is a metal.

Which of the following is a metalloid?

  1. Silver

  2. Mercury

  3. Bismuth

  4. Beryllium

Show answer
Correct Option: C
Explanation:

Bismuth is a metalloid.

Which of the following metals is non-malleable and non-ductile?

  1. Zinc

  2. Copper

  3. Sodium

  4. Potassium

Show answer
Correct Option: C
Explanation:

Sodium is non-malleable and non-ductile.

Which of the following is a poor conductor of electricity?

  1. Graphite

  2. Copper wire

  3. Tungsten wire

  4. Iron rod

Show answer
Correct Option: C
Explanation:

Tungsten is a poor conductor of electricity.

Which of the following exists in monoatomic state?

  1. Phosphorous

  2. Chlorine

  3. Nitrogen

  4. Neon

Show answer
Correct Option: D
Explanation:

Neon is a noble gas. It exists in monoatomic state.

Which of the following is a molecule of an element?

  1. Hydrogen chloride

  2. Acetic acid

  3. Ozone

  4. Water

Show answer
Correct Option: C
Explanation:

Ozone [O3 ] is a molecule of an element, i.e. oxygen.

Which of the following elements is lustrous?

  1. Fluorine

  2. Chlorine

  3. Iodine

  4. Bromine

Show answer
Correct Option: C
Explanation:

Iodine is a non-metal, which has lustre.

Which of the following is not a mixture?

  1. Acetic acid

  2. Milk

  3. Petrol

  4. Amalgam

Show answer
Correct Option: A
Explanation:

Acetic acid is not a mixture. It is a compound.

Which of the following is a characteristic of compounds?

  1. Compounds vary in composition and properties.

  2. Elements in a compound vary in composition.

  3. Properties of a compound differ from those of its constituent elements.

  4. Separation of a compound into its elements is not possible chemically.

Show answer
Correct Option: C
Explanation:

Properties of a compound differ from those of its constituent elements.

Which of the following is a homogeneous mixture?

  1. Petrol in diesel

  2. Oil in water

  3. Iron and sulphur

  4. Sand in water

Show answer
Correct Option: A
Explanation:

Petrol in diesel is a homogeneous mixture.

Which of the following forms a homogenous mixture?

  1. Alcohol in water

  2. Oil in water

  3. Carbon disulphide in water

  4. Petrol in water

Show answer
Correct Option: A
Explanation:

Alcohol in water forms a homogeneous mixture. All others are heterogeneous mixtures.

Which of the following is not a property of any individual constituent of sugar?

  1. Black insoluble solid

  2. Invisible and odourless

  3. Crystalline solid

  4. Gaseous in nature

Show answer
Correct Option: C
Explanation:

Starch has carbon, hydrogen and oxygen as its constituents. Option (1) is the property of carbon. Option (2) is the property of oxygen and hydrogen. Option (3) is the property of sugar, not its constituents. Option (4) is the property of oxygen and hydrogen.

Which of the following is a heterogeneous mixture?

  1. Copper + zinc

  2. Iodine in alcohol

  3. Sugar in water

  4. Charcoal and sulphur

Show answer
Correct Option: D
Explanation:

Charcoal and sulphur form a heterogeneous mixture.

Which type of mixture is formed by iodine in alcohol?

  1. Homogeneous and liquid-liquid mixture

  2. Homogeneous and solid-liquid mixture

  3. Heterogeneous and liquid-liquid mixture

  4. Heterogeneous and solid-liquid mixture

Show answer
Correct Option: B
Explanation:

It is a homogeneous and a solid-liquid mixture.

What type of mixture is formed by copper and zinc?

  1. Heterogeneous and solid-solid mixture

  2. Homogenous and solid-non solid mixture

  3. Homogenous and solid-solid mixture

  4. Heterogeneous and solid-non solid mixture

Show answer
Correct Option: C
Explanation:

It is a homogenous and solid-solid mixture.

Which of the following statements is incorrect for an element?

  1. It cannot be converted into anything simpler.

  2. Each element consists of only one kind of atom.

  3. It exists as an individual atom or a molecule.

  4. Different elements are composed of the same atoms.

  5. Different elements are composed of the different atoms.

Show answer
Correct Option: D
Explanation:

Different elements are composed of different atoms.

Which of the following is chemically inert?

  1. Gold

  2. Carbon

  3. Beryllium

  4. Helium

  5. potassium

Show answer
Correct Option: D
Explanation:

Helium is a noble gas. So, it is chemically inert.

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