• Elements, Compounds and Mixtures
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Elements, Compounds and Mixtures

Description: concept builder on metals,non metals,compound molecule
Number of Questions: 15
Created by:
Tags: electron.atom.molecule.compound pure substance graphite Elements, Compounds & Mixtures Non Metal Compounds Metal
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Which of the following is responsible for a chemical reaction to occur?

  1. Atom

  2. Electron

  3. Molecule

  4. Ion

  5. Compound

Show answer
Correct Option: B
Explanation:

Electron is a particle, which is responsible for a chemical reaction to occur. The electron is located inside of an atom.

When two elements are chemically combined, which of the following is formed?

  1. Atom

  2. Mixture

  3. Compound

  4. Molecule

  5. Elements cannot be combined

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Correct Option: C
Explanation:

Compound is formed by chemical combination of elements.

Which of the following non-metals exists in solid state at room temperature?

  1. Germanium

  2. Bromine

  3. Chlorine

  4. Nitrogen

  5. Sulphur

Show answer
Correct Option: E
Explanation:

Sulphur is a non-metal and exists in solid state at ordinary temperature.

Which of the following statements is false?

  1. An electron is a sub atomic particle.

  2. Molecules are formed by chemical combinations of atoms.

  3. Alloy is a compound.

  4. Different elements are composed of the same atoms.

  5. The constituents of a compound do not retain their individual properties.

Show answer
Correct Option: D
Explanation:

A mixture is a physical combination of compounds and is not pure.

Which of the following metals exists in liquid state at room temperature?

  1. Iron

  2. Mercury

  3. Sodium

  4. Calcium

  5. Bromine

Show answer
Correct Option: B
Explanation:

Mercury is the metal, which exists in liquid state at room temperature.

Which of the following molecules contains the same kind of atoms?

  1. Hyposulphite of soda

  2. Laughing gas

  3. Quartz

  4. Washing soda

  5. Hydrargyrum

Show answer
Correct Option: E
Explanation:

It contains only mercury atoms (Hg).

Which of the following statements is false?

  1. Phosphorous is an illuminating element.

  2. Sodium metal when added to water produces flames.

  3. Graphite is a non-conductor of electricity.

  4. An element can exist in gaseous, liquid and solid states.

  5. Metals are lustrous.

Show answer
Correct Option: C
Explanation:

Graphite is the only non-metal, which is a good conductor of electricity.

Which of the following statements is false?

  1. Metals like copper, silver, and gold are used to make coins.

  2. Iodine and ammonia are sublimating substances.

  3. Nitrogen is a diatomic molecule.

  4. A mixture is pure where as a compound is impure.

  5. The chemical formula of tin oxide is SnO.

Show answer
Correct Option: D
Explanation:

Mixture is impure and a compound is in pure state.

What is the Latin name of sodium?

  1. Aurum

  2. Natrium

  3. Stannous

  4. Plumbum

  5. Kalium

Show answer
Correct Option: B
Explanation:

Natrium is the Latin name of sodium.

Which of the following is a non metal?

  1. Boron

  2. Tin

  3. Potassium

  4. Astatine

  5. Gallium

Show answer
Correct Option: A
Explanation:

Boron is a nonmetal, belongs to 3rd group and has a symbol - B. The other elements of this group are aluminium, gallium,  indium, thallium.

Which of the following metals is used to make steel?

  1. Silver

  2. Magnesium

  3. Ferrum

  4. Sodium

  5. Francium

Show answer
Correct Option: C
Explanation:

Ferrum means iron, and iron is used in making steel (Steel is alloy of iron and carbon).

Diamond is a different physical form of which of the following chemical elements?

  1. Carbon

  2. Silicon

  3. Graphite

  4. Igneous rock

  5. Metamorphic rock

Show answer
Correct Option: A
Explanation:

Diamond is a different physical form of carbon.

How many total atoms are present in silica?

  1. Two

  2. One

  3. Three

  4. Four

  5. No atoms in silica.

Show answer
Correct Option: C
Explanation:

In a silica molecule there are one silicon atom and two oxygen atoms. So total atoms = three

[Chemical Formula of silica = SiO2 ]

Which of the following statements is false about a compound, which is combined in the fixed proportion?

  1. 4 grams of hydrogen combine with 32 grams of oxygen to give 36 grams of water.

  2. In the molecule of carbon dioxide, carbon and oxygen are present in fixed ratio of 3 : 8 by mass.

  3. In the molecule of water, hydrogen and oxygen are present in the ratio of 1 : 8.

  4. 12 grams of carbon combine with 32 grams of oxygen to give 40 grams of carbon dioxide.

  5. In the molecule of carbon monoxide (CO), the ratio of carbon and oxygen is 3 : 8.

Show answer
Correct Option: E
Explanation:

In the molecule of carbon monoxide (CO), the ratio of carbon and oxygen is 3 : 4,  but not 3 : 8 [CARBON : OXYGEN = 12 : 16   = 3 : 4]

Which of the following statements regarding an element is false?

  1. Elements combine randomly to form a compound.

  2. Elements are represented by symbols.

  3. The atoms of an element are different from atoms of other elements.

  4. The number of atoms present in a molecule of an element is known as the atomicity of the element.

  5. A compound can be split into simpler substances or elements.

Show answer
Correct Option: A
Explanation:

No, elements combine in fixed proportion by mass to form a compound.

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