Question # 1

A reverse reaction is one that

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Speeds up gradually

Proceeds from left to right

In which reactants react to form products

Slow down gradually

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

The electropositive elements have the tendency to

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Lose electrons

Gain electrons

Share electrons

All of these

Which isotope is used in nuclear reactors.

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U-234

U-235

U-238

All of these

Whcih subshells are present in L - shell?

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S and P

Only s -sub shell

Only p - sub shell

Sub shell

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

Which among of the followign has a double covalent bond.

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Ethane

Methane

Acetylene

Ethylene

According to Rutherford's atomic theory, atom should produce.

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Line spectrum

Continuous spectrum

Both a and b

None of these

Actinide series starts after the element

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Actinium

Lanthanum

Osmum

Silver

Elements with atomic no .58 to 71 are called.

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Actinides

Lanthanides

Both a and b

None of these

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.

How many electrons can be accommodated at the most in the third shell of the elements.

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8

10

18

32

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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