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Chemistry 9th Class English Medium Online Test MCQs With Answers
Question # 1
A reverse reaction is one that
Choose an answer
Speeds up gradually
Proceeds from left to right
In which reactants react to form products
Slow down gradually
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Question # 2
What will happen if the rates of forward and reverse reactions are very high
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The reaction will be practiclly irreversible
The equilibrium point will reach very soon
The equilibiurm point will reach very late
The reaction will not attain the state of dynamic equilibrium
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Question # 3
The electropositive elements have the tendency to
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Lose electrons
Gain electrons
Share electrons
All of these
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Question # 4
Which isotope is used in nuclear reactors.
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U-234
U-235
U-238
All of these
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Question # 5
Whcih subshells are present in L - shell?
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S and P
Only s -sub shell
Only p - sub shell
Sub shell
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Question # 6
Mark the icorrect statement about ionization energy.
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It is measured in kJmol-1
It is absorption of energy
It decreased in a period
It decrese in a group
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Question # 7
Which among of the followign has a double covalent bond.
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Ethane
Methane
Acetylene
Ethylene
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Question # 8
According to Rutherford's atomic theory, atom should produce.
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Line spectrum
Continuous spectrum
Both a and b
None of these
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Question # 9
Actinide series starts after the element
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Actinium
Lanthanum
Osmum
Silver
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Question # 10
Elements with atomic no .58 to 71 are called.
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Actinides
Lanthanides
Both a and b
None of these
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Question # 11
When a reaction will be come a reversible one?
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If the actvation eneryg of the forward reaction is comparrble to that of backward reaction
If the activation energy of the forward reaction is higher than that of backward reaction
If the activationenergy of the forward reaction is lower than that of backward reaction
If the enthalpy change of both the reactions is zero.
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Question # 12
How many electrons can be accommodated at the most in the third shell of the elements.
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8
10
18
32
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Question # 13
Period nuebr tells abou the
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No. of valance electrons
No. of electronic shells
Both a and b
None of the above
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