Q.1
The equilibrium constant for reversible reaction N2 + 3H2 ⇔ 2NH3 is K and for the reaction ½ N2 + (3/2)H2 ⇔ NH3 The equilibrium constant is K'. K and K' will be related as [ MP CET 1998]
  • a) K=K'
  • b) K'=√(K)
  • c)K=√(K')
  • d)K × K'=1
Q.2
Which oxide of nitrogen is most stable at 273 K ?
  • a)
    ch-8_qn-31choice_img_no1.png
  • b)
    ch-8_qn-31choice_img_no2.png
  • c)
    ch-8_qn-31choice_img_no3.png
  • d)
    ch-8_qn-31choice_img_no4.png
Q.3
The equilibrium constant for reaction SO3 → SO2 + ½O2 is Kc=4.9 × 10-the value of Kc for the reaction 2SO2 + O2 → 2SO3 will be [ AIEEE 2006]
  • a) 416
  • b) 2.4 × 10-3
  • c) 9.8 × 10-2
  • d) 4.9× 10-2
Q.4
the equilibrium constant Kp for the reaction PCl5 ↔ PCl3 + Cl2 is 16 If the volume of the container is reduced to half of its original volume, the value of Kp for the reaction at the same temperature will be
  • a)32
  • b) 64
  • c)16
  • d)4
Q.5
For a reaction N2 + 3 H2 → 2NH3; °H=-22 kcal. If energy of activation for this reaction is 70 kcal, the energy of activation for backward reaction is
  • a) 70 kcal
  • b) 92 kcal
  • c)48 kcal
  • d)None of these
Q.6
the value of reaction quotient before any reaction occurs is
  • a) ∞
  • b) -1
  • c)0
  • d)1
Q.7
Consider the following equilibrium in closed container N2O4 ⇔ 2NO2 . At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following statement holds true regarding the equilibrium constant (Kp) and degree of dissociation ( α) [ IIT 2002]
  • a) Neither Kp nor α changes
  • b) Both Kp nor α changes
  • c) Kp changes but α does not change
  • d) Kp does not change but α changes
Q.8
For reaction Co + K2O ⇔ Co2 + H2 at given temperature, the equilibrium amount of CO2 can be increased by [ IIT 1998]
  • a)Adding a suitable catalyst
  • b) Adding an inert gas
  • c)Decreasing the volume of the container
  • d)Increasing the amount of CO
Q.9
The yields of NH3 in the reaction N2 + 3H2 ↔ 2NH3 ; ΔH=-22.08 kcal is affected by [ Pb CET 1997]
  • a) Change in pressure and temperature
  • b) Change in temperature and concentration of H2
  • c)Change in pressure and concentration of N2
  • d)Change in pressure, temperature and concentration of N2
Q.10
If 1.0 mole of I2 is introduced into 1.0 litre flask at 1000K which leads to dissociation, at equilibrium, ( Kc=10-6), which one is correct?
  • a) [ I2(g)] > I-]
  • b) [ I2(g)] < I-]
  • c) [ I2(g)]=I-]
  • d) [ I2(g)]=½ I-]
Q.11
At constant temperature, the equilibrium constant ( Kp) for the decomposition reaction N2O4 ⇔ is expressed by Kp=4x2P/(1-x2) where P is pressure, x is extent of decomposition. Which of the following statement is true [ IIT 2001]
  • a) Kp increases with increase with increase of P
  • b) Kp increases with increase with increase of x
  • c) Kp increases with decrease with increase of P
  • d) Kp remains constant with change in P or x
Q.12
Four species are listed below (i) HCO3-   (ii) H+ (iii) HSO4-   (iv) HSO3F Which one of the following is the correct sequence of their acid strength [ AIEEE 2008]
  • a) iii < i < iv < ii
  • b) iv < ii < iii < i
  • c)ii < iii < i < iv
  • d)i < iii < ii < iv
Q.13
Among the following acids, which has the lowest pKa value?
  • a) CH3COOH
  • b) HCOOH
  • c)(CH3)2CHOOH
  • d)CH3CH2COOH
Q.14
Which of the following bases is the weakest?
  • a) C9H7N :  Kb=6.3 ×10-10
  • b) C2H5NH2 :  Kb=5.6 ×10-4
  • c) C6H5NH2 :  Kb=3.8 ×10-10
  • d)NH4OH :   Kb=1.6 ×10-6
Q.15
A solution which is 10-3 M each in Mn2+, Fe2+, Zn2+ and Hg2+ is treated with 10-16M sulphide ion. If Ksp of MnS, FeS, ZnS and HGS are 10-15,10-23, 10-20 and 10-54 respectively, which one will precipitate first.. [ IIT 2003]
  • a) FeS
  • b) MnS
  • c) HgS
  • d) ZnS
Q.16
On adding 0.1M solution each of [Ag+], [Ba2+], [Ca2+] in a Na2SO4 solution, species first precipitated is [Ksp of BaSO4=10-11, Ksp of CaSO4=10-6, Ksp of Ag2SO4=10-5]
  • a)Ag2SO4
  • b) BaSO4
  • c)CaSO4
  • d)All of these
Q.17
Precipitation takes place when the ionic product [ Roorkee 1983]
  • a) Equals the solubility product
  • b) Exceeds the solubility product
  • c)Is less than the solubility product
  • d)Is almost zero
Q.18
At 25°C, the dissociation constant of Ch3COOH and NH4OH in aqueous solution are almost same ( 10-5). If pH of some acetic acid solution is 3.0 The pH of solution of NH4OH of same concentration at the same temperature would be [ Roorkee 1990]
  • a) 3.0
  • b) 4.0
  • c)10.0
  • d)11.0
Q.19
When 0.1 mol of CH3NH2 ( ionization constant,Kb=5 ×10-4) is mixed with 0.08 mol HCl and the volume is maid up toFind the [H+] of resulting solution. [ IIT 2005]
  • a) 8 × 10-5
  • b) 2 × 10-11
  • c) 1.23 × 10-4
  • d) 8 × 10-11
Q.20
Species acting both as Bronsted acid and base is
  • a)HSO4-
  • b) Na2CO3
  • c)NH3
  • d)OH-
Q.21
The pH of 0.1M aqueous solution of weak acid ( HA) isIts degree of dissociation is
  • a) 1%
  • b) 10%
  • c)50%
  • d)25%
Q.22
An acid buffer solution can be prepared by mixing equimolar amount of ..[ IIT 1981]
  • a) Formic acid and sodium formate
  • b) NH4Cl and NH4OH
  • c)H2SO4 and NA2SO4
  • d)CH3CONH2 and KOH
Q.23
pKa of acetic acid is 4.The concentration of CH3COONa is 0.01 M. The pH of CH3COONa ia [ Orissa JEE 2004]
  • a) 8.37
  • b) 4.37
  • c) 4.74
  • d) 0.474
Q.24
In a saturated solution of the sparingly soluble strong electrolyte AgIO3 molecular mass=283, the equilibrium which sets in is AgIO3 ⇔ Ag+ + IO3- If the solubility product constant Ksp of AgIO3 at given temperature is 1.0 ×10-8, what is the mass of AgIO3 contained in 100 ml of its saturated solution [ AIEEE 2007]
  • a)1.0 ×10-4 g
  • b) 28.3 ×10-2 g
  • c)2.83 ×10-3 g
  • d)1.0 ×10-7 g
Q.25
Which of the following salts undergoes anionic hydrolysis?
  • a) CuSO4
  • b) Na2CO3
  • c)NH4Cl
  • d)FeCl3
Q.26
At 90°C, pure water has H3O+ ion concentration of 10-6 mol/L. the Kw at 90°C is
  • a) 10-12
  • b) 10-14
  • c)10-6
  • d)10-8
Q.27
A weak acid HX has the dissociation constant 1 × 10-5M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1M solution of NaX is
  • a) 0.0001%
  • b) 0.01%
  • c) 0.1%
  • d) 0.15%
Q.28
An acidic buffer solution can be prepared by mixing solution of .. [ IIT 1981]
  • a)Sodium acetate and acetic acid
  • b) Ammonium chloride and ammonium hydroxide
  • c)Sulphuric acid and sodium sulphate
  • d)Sodium chloride and sodium hydroxide
Q.29
The value of ionic product of water at 393K is [ Tamil Nadu CET 2002]
  • a) Less than 1 × 10-14
  • b) Greater than 1 × 10-14
  • c)Equal to 1 × 10-14
  • d)Equal to 1 × 10-7
Q.30
aht is the decreasing order of strength of the bases:
ch-8_que_no-59_img_no1.png
  • a)
    ch-8_qn-59choice_img_no1.png
  • b)
    ch-8_qn-59choice_img_no2.png
  • c)
    ch-8_qn-59choice_img_no3.png
  • d)
    ch-8_qn-59choice_img_no4.png
0 h : 0 m : 1 s