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MDCAT Chemistry Chapter 2 Atomic Structure Online Test MCQs With Answers

Question # 1

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

Choose an answer

CH2

C3H6

C2H4

C4H8

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Question # 2

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

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Question # 3

During combustion analysis, which one is used for absorbing carbon dioxide:

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50% KOH

5% KOH

Mg(ClO4)2

Silica gel

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Question # 4

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

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Question # 5

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

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Isotopes

isobars

Isotones

isomers

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Question # 6

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

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1/3

1/5

2/3

5/6

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Question # 7

Moles of protons in 20g of SO3

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Question # 8

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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Question # 9

Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.

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Negatively charged

H⁺ ions

Positively charged

equal positive and negative ions

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Question # 10

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

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