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Chemistry Past Questions and Answers

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Chemistry Questions

Question 211:

For iron to rust, there should be present?

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A Oxygen
B Moisture
C Carbondioxide
D Oxygen and moisture
E Oxygen, moisture and carbondioxide

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Question 212:

The mass number of an atom is?

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A The number of electrons in the atom
B The number of protons in the nucleus of the atom
C The number of neutrons in the nucleus of the atom
D The sum of numbers of electrons and protons inthe atom
E The sum of numbers of proton and neutrons in the nucleus of the atom

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Question 213:

Sodium and potassium belong to the same group of the Periodic Table. This is because?

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A Both are metals
B Both are soft and lighter than water
C Both form cations by losing electrons
D Both have identical electronic configuration
E Both react with water vigorously

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Question 214:

Oxidation is the process of?

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A Gain of electrons
B Loss of electrons
C Gain of hydrogen
D Loss of oxygen
E Addition of an electropositive element to a substance

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Question 215:

the number of atoms in one mole of a substance is equal to?

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A The atomic number
B The avogadro number
C The gas constant
D The number of neutrons
E The number of electrons

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