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Online Tests
Chemistry Fsc Part 1 Chapter 1 Online Test MCQs With Answers
Question # 1
Haemoglobin is a Macro molecule and consists of approximately atoms.
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5000
10,000
68000
15000
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Question # 2
Actual yield is mostly less than the theoretical yield due to the reason that
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Rates of reactions are slow
Loss of the product during handling
Reactions are never completed 100%
Law of conservation of mass is not true
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Question # 3
Calcium has isotopes
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7
9
1
6
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Question # 4
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 # 5
Stoichiometric calculations cannot applied to reversible reactions because.
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Product again changes to reactant
Less product is formed
Reaction goes only in one direction
Products do not disappear.
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Question # 6
The number of moles of CO
2
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
In mass spectrometry, ions are separated on the basis of.
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Masses only
Charge only
Change to mass ratio
Mass to charge ratio
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Question # 8
How many moles of AgCI are produced by combination of 1.0 mole of AgNO
3
and 2.0 mole of NaCI
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1.0
2.0
3.0
4.0
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Question # 9
In mass spectrometry, ions are produced by
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Heat at high temperature
Passing gas through high voltage plates
Throwing fast moving electrons on gas molecules
All of them
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Question # 10
One mole of ethanol and one mole of ethane have an equal
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Masses
Number of atoms
Number of electrons
Number of molecules
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Question # 11
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 # 12
How many atoms are present in half mol of oxygen gas. Gas exist in diatomic state.
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3.01 x 10
23
6.02 x 10
23
2 x 10
23
1.003 x 10
23
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Question # 13
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 # 14
If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.
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CH2
C2H4
C3H6
C4H8
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Question # 15
Which statement is incorrect about 64 g of SO2.
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It is one mole SO2
The number of SO2 molecule are 6.02 x 10
23
The number of oxygen atoms are 6.02 x 10
23
The number sulphur atom are 6.02 x 10
23
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Question # 16
Tin has Isotopes
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7
9
11
5
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Question # 17
How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.
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3.01 x 10
23
1 x 10
23
6.02 x 10
23
1.03x 10
23
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