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

1.  +6

2.  +3

3.  3

4.   -6

4

+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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

Explanation :
No Explanation available for this question

# The purest form of coal is

1.  peat

2.  anthracite

3.  lignite

4.  bituminous coa

4

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

4

calcinations

Explanation :
No Explanation available for this question

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