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MDCAT Chemistry Chapter 2 Atomic Structure Online Test MCQs With Answers

Question # 1

The number of moles of CO2 which contain 16g of oxygen

Choose an answer

0.25

1.00

1.50

0.50

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Question # 2

Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water

Choose an answer

4x6.022x10ê23

1×6.022x10ê23

2x6.022 x10ê23

2x6.022x10ê22

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Question # 3

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

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Question # 4

1 gram formula refers to

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Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

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Question # 5

Moles of protons in 20g of SO3

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Question # 6

To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:

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the temperature at the top of the mountain is low

the density of water decreases at the mountains

the boiling point of water decreases at the mountain

the hydrogen bonding in water changes with the change of height

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Question # 7

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

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Question # 8

Which of the following is a limitation of balanced chemical equation

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Conditions and rate of reactions

Physical state and mechanism

Reactants and products and their coefficients

Both (a) and (b)

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Question # 9

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

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Question # 10

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

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