Find the temperature at which the reaction Ag2O(s)→2Ag(s)+1/2O2(g) at 1 atmospheric pressure will be in equilibrium.If the value of ΔH and ΔS for the reaction are 30.58 Kj and 66.11 JK-

1.  462.6K

2.  486.4K

3.  364.5K

4.  521.2 K

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4
Correct Answer :

462.6K


Explanation :
No Explanation available for this question

When enthalpy and entrophy change for a chemical reaction -2.5x103 cals and 7.4 cals deg-1 respectively.predict that reaction at 298 K is

1.  Spontaneous

2.  Reversible

3.  Irreversible

4.  Non-spontaneous

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4
Correct Answer :

Spontaneous


Explanation :
No Explanation available for this question

A reaction will never be spontaneous at any temperature and pressure provided

1.  ΔS positive and ΔH positive

2.  ΔS positive and ΔH negative

3.  ΔS negative and ΔH positive

4.  ΔS negative and ΔH negative

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4
Correct Answer :

ΔS negative and ΔH positive


Explanation :
No Explanation available for this question

Hand picking method is used for the concentration of following are

1.  Cassiterite

2.  Haematite

3.  Calamine

4.  Galena

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4
Correct Answer :

Haematite


Explanation :
No Explanation available for this question

If ΔE is the heat of reaction for C2H5OH(1)+3O2(g)→2CO2(g)+3H2O(l) at constant volume,the ΔH(Heat of reaction at constant pressure)at constant temperature is

1.  ΔH=ΔE+2RT

2.  ΔH=ΔE-2RT

3.  ΔH=ΔE+RT

4.  ΔH=ΔE-RT

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4
Correct Answer :

ΔH=ΔE-RT


Explanation :
No Explanation available for this question

The olive oil used in froth floatation process is called

1.  Frothing agent

2.  Collecting agent

3.  Conditioning agent

4.  Lubricating agent

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4
Correct Answer :

Frothing agent


Explanation :
No Explanation available for this question

Which of the following is not correct

1.  Dissolution of NH4Cl is excess of water is an endothermic process

2.  Neutralisation process is always exothermic

3.  The absolute value of enthalpy(H) can be determined experimentally

4.  The heat of reaction at constant volume is denoted by E

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4
Correct Answer :

The absolute value of enthalpy(H) can be determined experimentally


Explanation :
No Explanation available for this question

In blast furnace haematite is reduced to iron mainly by

1.  Coke

2.  H2gas

3.  CO gas

4.  water gas

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4
Correct Answer :

CO gas


Explanation :
No Explanation available for this question

The froth floatation process is used for the concentration of

1.  Ore having low density

2.  Ore having magnetic nature

3.  Ore having high density

4.  Ore having water soluble gangue

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4
Correct Answer :

Ore having low density


Explanation :
No Explanation available for this question

The heat of formation (ΔHf) of H2O(g) is -243 KJ.ΔE of it at temperature T is

1.  -243+RT

2.  -243RT

3.  -243+1/2RT

4.  -243-1/2 RT

View Answer  
4
Correct Answer :

-243+1/2RT


Explanation :
No Explanation available for this question
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