In the Haber process for the industrial manufacture of ammonia involving the reaction, N2 + 3H2 2NH3 at 200 atm pressure in the presence of a catalyst, temperature of about 500°C. This is considered as optimum temperature for the process because

(1) yield is maximum at this temperature

(2) catalyst is active only at this temperature

(3) energy needed for the reaction is easily obtained at this temperature

(4) rate of the catalytic reaction is fast enough while the yield is also appreciable for this exothermic reaction at this temperature.

Subtopic:  Le Chatelier's principle |
 61%
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What is the minimum mass of CaCO3 (s), below which it decomposes completely, required to establish equilibrium in a 6.50 litre container for the reaction : [ KC = 0.05 mole/litre]

CaCO3 (s) CaO(s) + CO2(g)

(1) 32.5g

(2) 24.6 g

(3) 40.9g

(4) 8.0 gm

Subtopic:  Kp, Kc & Factors Affecting them |
 62%
From NCERT
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The value of kp for the reaction at 27°C Br2(l) + Cl2(g) 2BrCl(g) is '1 atom'. At equilibrium in a closed container partial pressure of BrCI gas is 0.1 atm and at this temperature the vapour pressure of Br2(l) is also 0.1 atm. Then what will be minimum moles of Br2(l) to be added to 1 mole of Cl2 , initially, to get above equilibrium situation :

(1) 106 moles

(2) 56moles

(3) 156moles

(4) 2 moles

Subtopic:  Kp, Kc & Factors Affecting them |
From NCERT
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5 mol PCI5(g) and one mole N2 gas is placed in a closed vessel. At equilibrium PCI5(g) decomposes 20% and total pressure in to the container is found to be 1 atm. The kP for equilibrium

PCl5(g) PCl3(g) + Cl2(g)

(1) 124atm

(2) 14atm

(3) 116atm

(4) 128atm

Subtopic:  Kp, Kc & Factors Affecting them |
From NCERT
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The degree of dissociation of water in a 0.1 M aqueous solution of HCl at a certain temperature t°C is 3.6 x 10–15. The temperature t must be :

(1) < 25°C

(2) = 25°C

(3) > 25°C

(4) insufficient data to predict

Subtopic:  Introduction To Equilibrium |
 51%
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Which one is the correct expression below for the solution containing 'n' number of weak acids?

(1) [H+]=i=1nKiCi

(2) [H+]=i=1nKiCi

(3) [H+]=i = 1nKiCi

(4) none of these

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 75%
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The pH of glycine at the first half equivalence point is 2.34 and that at second half equivalence point is 9.60.At the equivalence point (The first inflection point) The pH is :

(1) 3.63

(2) 2.34

(3) 5.97

(4) 11.94

Subtopic:  pH calculation |
 66%
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A 1.458 g of Mg reacts with 80.0 ml of a HCI solution whose pH is –0.477. The change in pH after all Mg has reacted. (Assume constant volume. Mg = 24.3 g/mol.)(log 3 = 0.477)

(1) –0.176

(2) +0.477

(3) –0.2385

(4) 0.3

Subtopic:  pH calculation |
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Find the pH (initial pH –final pH) when 100 ml 0.01 M HCl is added in a solution containig 0.1 m molesof NaHCO3 solution (pH = 9 ) of negligible volume ( Kai =10–7, Ka, =10–11 for H2CO3) :

(1) 6 + 2 log3

(2) 6 – log3

(3) 6 + 2 Log2

(4) 6 – 2 log3

Subtopic:  pH calculation |
From NCERT
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The ionization constant of benzoic acid is 6.46 x 10–5 and Kc for silver benzoate is 2.5 x 10–13. How many times silver benzoate is more soluble in a buffer of pH = 3.19 as compared to its solubility in pure water ?

(1) 3.317

(2) 9.5

(3) 1000

(4) 7.5

Subtopic:  Introduction To Equilibrium |
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