1st Year Chemistry MCQS with Answers Chapter 1

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1st Year Chemistry MCQS with Answers
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Many elements have fractional atomic masses. This is because
Atomic masses are average masses of isobars
Atomic masses are average masses of isotopes proportional to their relative abundance
The mass of the atom is itself fractional
Atomic masses are average masses of isotopes

A limiting reactant is that one which
Is mostly a cheaper substance as compared to other reactants
Gives least number of moles of products
Gives greatest number of moles of products
Is left behind after the completion of reaction

Isotopes differ in
Chemical properties which depend upon weight
Properties which depend upon mass
Atomic number
Arrangement of electrons in orbital

Calcium has isotopes
6
9
7
1

The number of moles of CO2which contain 8.0 g of oxygen
0.5
1
0.25
1.5

How many moles of AgCI are produced by combination of 1.0 mole of AgNO3and 2.0 mole of NaCI
4
3
1
2

I molar volume of a gas at S.T.P is occupied by
22.4 m3of gas
1 g of gas
1 gram molecular mass of gas
6 x 1023g of gas

Isotopes are the atoms of same element with similar chemical properties but different
Atomic weight
Atomic volume
Atomic structure
Atomic number

Which of the following compound has the highest % o f oxygen by weight
CH3– OH
C2H5OH
H2O
HCOOH

Tin has Isotopes
5
9
11
7

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