The oxidation number of cobalt in K3[Co(NO2)] is

1.  +6

2.  +3

3.  3

4.   -6

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4
Correct Answer :

+3


Explanation :
No Explanation available for this question

The volume of 1.8 g of carbon monoxide at 270C and 0.821 atm pressure is (R =0.0821 LatmK-1 mol-1)

1.  1.5 L

2.  0.3 L

3.  3 L

4.  30 L

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4
Correct Answer :

3 L


Explanation :
No Explanation available for this question

gaseous mixture of three gases A, B and C has a pressure of 10 atms. The total number of moles of all the gases is 10. If the partial pressures of A and B are 3.0 and 1.0 atm respectively and if  'C' has mol wt. of 2.0, what is the weight of 'C' in grams present in the mixture

1.  6

2.  3

3.  12

4.  8

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4
Correct Answer :

12


Explanation :
No Explanation available for this question

The weight of AgNO3 (mol. wt. 170) present in 100 mL of its 0.25 M solution is

1.  4.25g

2.  42.5g

3.  I7g

4.  l.7g

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4
Correct Answer :

4.25g


Explanation :
No Explanation available for this question

For a cell, the cell reaction is: Mg(s) + Cu2+(aq) →Cu(s) + Mg2+ (aq) If the standard reduction potentials of Mg and Cu are -2.37 and +0.34 V respectively. The emf of the cell is

1.  2.03 V

2.  -2.03 V

3.  2.71 V

4.  -2.71 V

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4
Correct Answer :

2.71 V


Explanation :
No Explanation available for this question

For the reaction partial pressures of CO2 and CO are 2.0 and 4.0 atm respectively at equilibrium. What is the value of Kp for the reaction

1.  0.5

2.  4.0

3.  8.0

4.  32

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4
Correct Answer :

8.0


Explanation :
No Explanation available for this question

After how many seconds will be concentration of the reactant in a first order reaction be halved if the rate constant 1.155x10-3sec-1

1.  600

2.  100

3.  60

4.  10

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4
Correct Answer :

600


Explanation :
No Explanation available for this question

If K1 and K2 are the equilibrium constants of the equilibria A and B respectively, what is the relationship between the two constants

1.  K1= K2

2.  K1=1/K2

3.  K2= K12 

4.  K12  = 1/K2

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4
Correct Answer :

K<sub>1</sub><sup>2&nbsp;</sup> = 1/K<sub>2</sub>


Explanation :
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The purest form of coal is

1.  peat

2.  anthracite

3.  lignite

4.  bituminous coa

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4
Correct Answer :

anthracite


Explanation :
No Explanation available for this question

Heating an ore in the absence of air below its melting point is called

1.  calcinations

2.  smelting

3.  roasting

4.  leaching

View Answer  
4
Correct Answer :

calcinations


Explanation :
No Explanation available for this question
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