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Chemistry Fsc Part 1 Chapter 1 Online Test MCQs With Answers

Question # 1

A limiting reactant is that one which

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Gives greatest number of moles of products

Gives least number of moles of products

Is left behind after the completion of reaction

Is mostly a cheaper substance as compared to other reactants

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Question # 2

How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.

Choose an answer

3.01 x 10²³

1 x 10²³

6.02 x 10²³

1.03x 10²³

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Question # 3

Which statement is incorrect about Dempster's mass spectrometer.

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Solid sample can be used in this mass spectrometer

Ions are detected on the basis of mass to charge ratio

Atoms or molecules are ionized with beam of electron.

This spectrometer work at one atmospheric pressure.

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Question # 4

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

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Question # 5

The Avogadro constant is the number of.

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Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

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Question # 6

the number of moles of CO2 which contain 8.0 g of oxygen.

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0.25

0.50

1.0

1.50

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Question # 7

During combustion analysis, CO2 produced is absorbed in

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Mg (CLO4)2

50% KOH

CaCl2

P2O5

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Question # 8

Isotopes differ in

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Properties which depend upon mass

Arrangement of electrons in orbital

Chemical properties which depend upon weight

Atomic number

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Question # 9

Many elements have fractional atomic masses. This is because

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The mass of the atom is itself fractional

Atomic masses are average masses of isobars

Atomic masses are average masses of isotopes

Atomic masses are average masses of isotopes proportional to their relative abundance

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