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MDCAT Chemistry Chapter 1 Introduction to fundamental concepts of chemistry Online Test MCQs With Answers

Question # 1

250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:

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0.2 molar

0.25 molar

0.3 molar

0.35 molar

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Question # 2

The molarity of 2% W/V NaOH solution is

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0.25

0.05

0.5

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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

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 # 5

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

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Question # 6

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 # 7

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

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Question # 8

Moles of protons in 20g of SO3

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Question # 9

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

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Question # 10

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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