Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol-1 respectively. Enthalpy of formation of HCl is

1.  93 kJ mol-1

2.  - 225 kJ mol-1

3.  - 93 kJ mol-l

4.  225 kJ mol-1

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4
Correct Answer :

- 93 kJ mol-l


Explanation :
No Explanation available for this question

For a reversible reaction,if the concentrations of the reactants are doubled,the equilibrium constant will be:

1.  one-fourth

2.  halved

3.  doubled

4.  the same

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4
Correct Answer :

the same


Explanation :
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Which one of the following is true for any diprotic acid,H2X

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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The half-life of a radioactive isotope is three hours.If the initial mass of the isotope was 300g,the mass which remained undecayed after 18 hours would be:

1.  4.68 g

2.  3.34 g

3.  2.17 g

4.  10.36 g

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4
Correct Answer :

4.68 g


Explanation :
No Explanation available for this question

A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the corners of a cube and B atoms are at the face centres.The formula of the compound is:

1.  A2B2

2.  AB3

3.  A2B

4.  A3B

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4
Correct Answer :

AB3


Explanation :
No Explanation available for this question

Which of the following colligative property can provide molar mass of proteins (or polymers or colloids) with greatest precision

1.  Osmotic pressure

2.  Elevation of boiling point

3.  Depression of freezing point

4.  Relative lowering of vapour pressure

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4
Correct Answer :

Osmotic pressure


Explanation :
No Explanation available for this question

The method usually employed for the precipitation of a colloidal solution is:

1.  dialysis

2.  addition of electrolytes

3.  diffusion through animal membrane

4.  condensation

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4
Correct Answer :

addition of electrolytes


Explanation :
No Explanation available for this question

Which statements is incorrect

1.  Ni(CO)4-Tetrahedral, paramagnetic

2.  

3.  Ni(CO)4-Tetrahedral, diamagnetic

4.  [Ni(Cl)4]2- Tetrahedral, paramagnetic

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4
Correct Answer :

Ni(CO)4-Tetrahedral, paramagnetic


Explanation :
No Explanation available for this question

In which of the following, bond angle is maximum

1.  NH3

2.  

3.  PCl3

4.  SCl2

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4
Correct Answer :


Explanation :
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Correct order of 1st ionisation potential (I.P.) among following elements Be, B, C, N, O is :

1.  B

2.  B

3.  Be

4.  Be

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4
Correct Answer :

B<Be<C<O<N


Explanation :
No Explanation available for this question
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