Measurement of Matter

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(1) The proportion by mass of hydrogen and oxygen in water is

2 points

(a) 2: 3

(b) 1:8

(d) 1:9

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2) The size of an atom is determined by its…………….

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(a) Diameter

(b) Radius

(d) Area

(d) Potentiometer

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(3) The chemical symbol of Cadmium is……….

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(a) Cd

(b) C

(d) Cu

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4) The total number in the atomic nucleus is called

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(a) Atomic number

(b) Atomic mass number

(d) None of the above

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(1) In a chemical reaction the total mass of the reactant is ………………. total mass of product formed.

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(a) Less than

(b) Equal to

(d) Double

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6) Molecular mass of water

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(a) 16

(b) 14

(d) 18

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7) One mole of carbon dioxide contains………………. Molecules.

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(a) 6.022 × 10⁻²⁴

(b) 6.022 × 10⁻²²

(d) 6.022 × 10²⁵

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8) Protons and neutrons are together called

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(a) Nucleus

(b) Nucleons

(d) All of these

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9) The nature of charge on acidic radicals

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(a) Positive

(b) Negative

(d) None of the above

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10) The proportion by mass of carbon and oxygen is

2 points

(a) 3:8

(b) 8:3

(d) 1:8

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