1. 20 ml 2 N KMnO4 is treated with excess MnSO₄ .4H₂O in presence of excess H₂O. The only product which contain Mn is MnO₂. The no. of ml moles of MnO₂ obtained are :
a. 20
b. 13.33
c. 33.33
d. 8


2. 0.7538g sample contains an unknown amount of As₂O₃ (M.wt. = 197.84). The sample was treated with HCl and reducing agent, resulting in the formation of AsCl₃(g), which was distilled into a beaker of water. Following the hydrolysis of AsCl₃as AsCl₃+ 2H₂OHAsO₂+ 3H⁺+ 3Cl^-the amount of HAsO₂was determined by titration with 0.05264 MI₂ , requiring 33.64 ml to reach the equivalence point. The redox products in the titration were H₃AsO₄ and I^-. What was the weight percent of As₂O₃in sample.
a. 23.24%
b. 24.25%
c. 11.0%
d. none of these


3. 80 ml 44.8 volume H₂O₂is mixed with 120 ml 3M H₂O₂ solution. The volume strength of resulting solution is
a. 38
b. 19
c. 76
d. 29


4. An equimolar mixture (w gm) of K₂CO₃ and KHCO₃ when treated with 0.6 M H₂SO₄  using methyl orange as indicator, the end point is obtained when 60 ml of H₂ SO₄ has been added. The same mixture (2w gm) when treated with x M H₂ SO₄ using phenolphthalein as indicator the end point is obtained when 0.6 x litre of H₂SO₄  has been added. x is
a. 0.1
b. 0.2
c. 0.4
d. 0.6



5. 2 mol of gas (A) and 96 gm of SO₂is mixed. The mass fraction of (A) in the mixture is 5/8. The gas (A) may be
a. SO₃
b. NO₂
c. O₂
d. none


6. W gm of a mixture containing Na₂ CO₃ and NaHCO₃ in 2 : 3 mol ratio requires x ml HCl for neutralisation using phenolphthalein as indicator. 2W gm of same mixture require y ml HCl for neutralisation using methyl orange as indicator. The value of y is
a. 5x
b. 7 x
c. 3.5 x
d. none


7. x gm of a solute is dissolved in a liquid to give a solution of volume V ml and density d gm/ml. The molality of the solution is (the mass of 1 molecule of solute is m gm) {N₀ is Avogadro number} :
a. x /(Vd - x)m
b. 1000x/m(Vd-x)N₀
c. x/N₀ m(Vd - x)
d. 1000x/N₀ (Vd -x)


8. 20 ml x M NaOH requires V ml y N H₂ SO₄ for complete neutralisation. Na₂ SO₄ formed is oxidised by 2V ml 0.1M F₂ into Na₂ S₂ O₈ . The value of y is :
a. 0.4
b. 0.8
c. 1.6
d. 0.2


9. 20 ml 0.1 N of a readucing agent reduces completely X₂ into X^- . Now X^- is completely oxidised into X₂ O²⁺ by V₁ ml 0.241M KMnO₄ (in H₂ SO₄ medium). Now X₂ O²⁺ is completely oxidised in X₃ O₄³⁺ by V₂ ml 0.4M K₂ Cr₂ O₇ (in H₂ SO₄ medium). The value of V₁& V₂ is
a. 6, (25/9)
b. 12, (25/18)
c. 6, (25/18)
d. none of these


10. 20 ml of 0.2 M KMnO₄ is reduced into Mn₂ O₃ during oxidation of excess of hydrogen gas. Mn₂ O₃ is oxidised into K₂ MnO₄ by CrO₃ . The reduction product of CrO₃ is further reduced by a reducing agent (Mol. wt. = M. eq. wt. = M/3)into Cr. If the wt. of Cr obtained is 312 mg then the oxidation state of Cr in the reduction product of CrO₃ is :
a. 2
b. 3
c. 4
d. none


11. x ml moles of FeCr₂ O₄ is treated with air (containing 20% by vol O₂ ) in presence of excess Na₂ CO₃ . The products are Na₂ CrO₄ , Fe₂ O₃ and CO₂
. The volume of air required measured at N.T.P. is
a. 196 x ml
b. 98 x ml
c. 28 x mol
d. 168 x mol


12. The concentration of CO₂ is expected to rise 440 ppm in year 2020. What would be the pH of rainwater in the year 2020 if molar solubility of CO₂ is 0.0343 L^-1 bar^-1 . K_a1 of CO₂ = 4.2×10^-7 .
a. 5.63
b. 4.72
c. 5.063
d. none


13. 1.0 metric ton coal containing 2.5% sulphur is burned and SO₂ produced in the combustion was dissolved in rainwater of volume equivalent to 2.0cm rain fall over 2.6km² area. Determine pH of rainwater if K_a of H₂ SO₃ = 1.5×10^-2 .
a. 4.8
b. 4.08
c. 0.48
d. none



14. 30 ml 0.3 M H₂ SO₃ solution reduces excess KIO₃ into I₂ . The no. of ml moles of hypo required to convert 50% of the I₂ formed into NaI are
a. 1.8
b. 0.9
c. 3.6
d. none

1. 0.01 mol of HBr(g) are heated in a vessel. At equilibrium 10^-6 mol of Br₂ were found. The value of equilibrium constant for 2HBr(g) H₂ (g) + Br₂ (g) is :
a. 1×10^-2
b. 1×10^-8
c. much greater than 1×10^-8
d. slightly less than 1×10^-12


2. A(g) dissociates into B(g), C(g) reversibly as A(g) B(g) + 3C(g). The molar mass of A was found to be decreased by 20%. The degree of dissociation of A is
a. (1/5)
b. (1/24)
c. (1/6)
d. (1/12)


3. The degree of dissociation of SO₃ is a under the condition that equilibrium pressure is equal to K_P for 2SO_3(g) 2SO_2(g) + O_2(g) . The degree of dissociation of SO₃ under the condition that K_P = x equilibrium pressure is 3 /4. The value of is
a. 5
b. 1/5
c. 2
d. none


4. 3 mol of PCl₅ is heated in presence of 1 mol Ne. at equilibirum the mol fraction of Cl₂ was found to be 1/3. Just after the attainment of equilibrium volume is doubled as well as temperature is increased. Knowing the dissociation to be endothermic the no. of moles of Cl₂ at new equilibrium will be
a. 3
b. 1.5
c. 2
d. 2.5


5. The mol fraction of N₂ in a mixture of N₂ and H₂ is 1/3. They react to form N₂ H_4(g) . At equilibrium N₂ H₄ was found to be 40% by mol. The value of K_P P² for N₂ + 2H₂ N₂ H₄ where P is pressure of the mixture at equilibrium is
a. 12.5
b. 25
c. 6.25
d. None


6. Solid ammonium carbamate (NH₂ CO₂ NH₄ ) is heated in a vessel (initially evacuated). The manometer attached with the vessel shows maximum pressure of 6P₀ . Now the solid is heated at the same temperautre in another vessel of same capacity in presence of ammonia and CO₂ in molar ratio 2:1. The manometer attached with the vessel shows minimum pressure of 3P₀ . The maximum pressure shown by the manometer will be
a. 6P₀
b. 9P₀
c. 32P₀
d. None


7. A vessel contains SO₃ , SO₂ , O₂ , He its molar ratio of 1:2:3:4 at equilibrium. Which of the following is correct
a. K_P for 2SO₃ 2SO₂ (g) + O₂ (g) is 1.2P where P is the total pressure of the vessel.
b. is the pressure due to inert gas.
c. both
d. none


8. The degree of dissociation of SO₃ at equilibrium pressure of O₂ equal to P₀ is . K_P for : 2SO₃ (g) 2SO₂ (g) + O₂ (g)
a. P₀ [ /(1- )]²
b. [(P₀² )/(1- )]
c. [(P₀³ )/2(1- )]²
d. [(2P₀³ )/(1-² )]


9. N₂ (g) and H₂ (g) are taken in 1:3 molar ratio. At equilibrium 40% by wt. ammonia is obtained. If equilibrium pressure is P₀ atm. K_P for 1/2N₂ + 3/2H₂
NH₃ is
a.
b.
c.
d. None


10. A vessel contains 1mol N₂ , 2 mol NH₃ and 3 mol H₂ at equilibrium. x moles of H₂ are removed along with volume is doubled. At new equilibrium 17gm of ammonia is found. The value of x is
a. 5.9
b. 1.9
c. 2.6
d. 4.5


11. 0.5 mol of Fe(s) is treated with steam. At equilibrium 0.3 mol of solid is found. At equilibrium pressure was found to be 6atm at 1000°K. The volume of the vessel is 8.2litres. K_P for 3Fe_(s) + 4H₂ O_(g) Fe₃ O_4(s) + 4H_2(g)
a. 1
b. 2
c. 8
d. 16


12. 2 mol of N₂ H_4(g) is heated to form N₂ and H₂ . As soon as N₂ and H₂ are found they react to form NH₃ . Two equilibria N₂ H_4(g) N₂ + 2H₂ ........(i) and N₂ + 3H₂ 2NH₃ ........(ii), are simultaneously established. Upto equilibrium the degree of dissociaiton of N₂ H₄ was found to be 50%. Which of the following is correct at equilibrium
a. [N₂ ] + [H₂ ] + 2[NH₃ ] = 3[N₂ H₄ ]
b. [N₂ ] + [H₂ ] + [NH₃ ] = [N₂ H₄ ]
c. [N₂ H₄ ] + [NH₃ ] = [N₂ ] + [H₂ ]
d. None of these


13. Ammonia is introduced in a vessel (initially evacuated). Ammonia is heated, it dissociates into N₂ and H₂ . The vapour density of the mixture is
a. 4
b. 4.25
c. 6.5
d. 23.5


14. The degree of dissociation of PCl₅ (g) at initial pressure of P₀ is same as the degree of dissociation of SO₃ into SO₂ and O₂ at equilibrium pressure equal to K_P for 2SO₃ 2SO₂ + O₂ . The value of K_P for PCl₅ PCl₃ + Cl₂ is
a. 4P₀ /5
b. 4P₀ /3
c. 4P₀
d. None


15. Which of the following may be correct
a. 2NH₃ (g) N₂ (g) + 3H₂ (g); K_P =2.49×10^-3 atm
b. 2SO₂ (g) + O₂ (g) 2SO₃ . yield to SO₃ is maximum at low temp., high pressure.
c. C(s) + H₂ O(g) CO(g) + H₂ (g); K_P = 9.42×10^-6 atm
d. both (2) & (3)


16. 4 moles of PCl₅ (g) and 2 moles of CO(g) are heated in a vessel. Two equilibria : i.  PCl₅ (g) PCl₃ (g) + Cl₂ (g) ;   ii. CO(g) + Cl₂ (g) COCl₂ (g) are established. At equilibrium 3 moles of PCl₃ and 2 moles of Cl₂ are obtained. Which of the following at equilibrium is correct
a. moles of CO = 1.5
b. K_C (i) x K_C (ii) = moles of PCl₅ + moles of CO + moles of COCl₂ .
c. both
d. none


17. The degree of dissociation of COCl₂ into CO and Cl₂ is 0.265 at equilibrium pressure of P₀ . The degree of dissociation at equilibrium pressure of 2P₀ is
a. 0.3125
b. 0.53
c. 0.18
d. 0.265


18. Equimolar mixture of A₂ B_4(g) and AB_3(g) is heated.Two equilibria A₂ B_4(g) A_2(g) + 2B_2(g) .......(i) ; 2AB_3(g) A_2(g) + 3B_2(g) ........(ii) are simultaneously established. At equilibrium moles of A₂ B₄ are equal to the sum of moles of A₂ and B₂ . Also the degree of dissociation of A₂ B₄ and AB₃ is same. The value of kc(i) / kc(ii) is
a. 320/27
b. 160/3
c. 80/3
d. none


19. At 40°C in a 5 litre flask LiCl.3NH₃ (s) starts to decomposes to give LiCl.NH₃ (s) & NH₃ . After sufficient time the pressure of NH₃ was observed to be 3atm. Now more LiCl.3NH₃ (s) is added at the same temperature but no increase in pressure of NH₃ is observed even after long time. Then:
a. K_P = 9
b. K_P< 9
c. K_P = 3
d. K_P> 9


20. 200gm CaCO₃ and 48gm carbon is heated in a vessel. Two equilibria CaCO₃ (s) CaO(s) + CO₂ (g) .....(i) ; CO₂ (g) + C(s) 2CO(g) .......(ii) are simultaneously established. At equilibrium 1 mol of CO is found and 50gm of CaCO₃ is remained. Which of the following is correct
a. K_C (1) = K_C (2)
b. Total amount of solid at equilibrium = 176gm
c. both
d. none