NEET 2018 IMPORTANT QUESTION PAPER FOR PRACTISE

                   TEST MULTIPLE CHOICE FOR NEET 2018

Q1.pH of a saturated solution of Ba(OH)₂ is 12. The value of solubility product (K_sp) of Ba(OH)₂ is 

A)4.0 × 10–6

B)5.0 × 10–6

C)3.3 × 10–7

D)5.0 × 10–7

Q2.The solubility of Ca3(PO4)2 in water is y moles/litre. Its solubility product is  A)6y4 B)36y4 C)64y5 D)108y5

Q3.Consider the following gaseous equilibria with equilibrium constants K₁ and K₂respectively.

SO_2(g) +  O_2(g)  SO_3(g)

2SO_3(g)  2SO_2(g) + O_2(g)

The equilibrium constants are related as ______.

A) 2k1=k22                     B)k22 =1/K1 C)k22 =2/K1 D)k22 =K1

Q4.pH value of which one of the following is NOT equal to one?  A)0.1 M CH3 COOH B)0.1 M HNO3 C)0.05 M H2SO4 D)50 cm3 0.4 M HCl + 50 cm3 0.2 M NaOH Q5.Which statement is/are true abourt ph value A) It may more then 14 B) It may less then zero C)It can never be less then 14 D)It can never be more then 14 Q6.The Ksp for Cr(OH)3 is 1.6 × 10–30. The molar solubility of this compound in water is :  A)1.6 × 10–30/27 B)( 1.6X10-30 )1/2 C)( 1.6X10-30 )1/4 D)( 1.6X10-30 /27 )1/4 Q7.At 25°C, the solubility product of Mg(OH)2 is 1.0 × 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions?  A)8 B)9 C010 D)11 Q8.The equilibrium constants for the reactions X  2Y and Z  P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is  A)1 : 36 B)1 : 1 C)1 : 3 D)1 : 9 Q9.For the reaction 2HI(g)  H2(g) + I2(g) – QKJ, the equilibrium constant depends upon  A)temperature B)pressure C)catalyst D)volume Q10.Four species are listed below (i) HCO3- (ii) H3O+ (iii) HSO4- (iv) HSO3F Which one of the following is the correct sequence of their acid strength?  A)iv < ii < iii < i B)ii < iii < i < iv C)i < iii < ii < iv D)iii < i < iv < ii Q11.The work done when two mole of an ideal gas is compressed from a volume of 5 m3 to 1 dm3 at 300 K, under a pressure of 100 kPa is  A)499.9 kJ     B)42495 kJ     C)–99.5 kJ       D)–499.9 kJ Q12Identify the correct statement from the following in a chemical reaction. A)The entropy always increases B)The change in entropy along with suitable change in enthalpy decides the fate of a reaction C)The enthalpy always decreases D) the enthalpy and the entropy remain constant Q13.For the reversible reaction, A(s) + B(g)  C(g) + D(g) ΔG° = 350kJ, which one of the following statements is true?  A)The reaction is thermodynamically non-feasible. B)The entropy change is negative. C)Equilibrium constant is greater than one. D)The reaction should be instantaneous. Q14.The enthalpy of vaporization of benzene is +35.3 kJ/mol at its boiling point of 80°C.The entropy change in the transition of vapour to liquid at its boiling point is ______. (in J mol−1 K−1)  A)−100 B)+100 C)+342 D)−342 Q15.The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27°C is  A)42.3 J mol–1 K–1 B)38.3 J mol–1 K–1 C)35.8 J mol–1 K–1 D)32.3 J mol–1 K–1 Q16.In view of the signs of ΔrG° for the following reactions PbO2 + Pb → 2 PbO, ΔrG° < 0 SnO2 + Sn → 2 SnO, ΔrG° > 0, Which oxidation states are more characteristic for lead and tin?  A)For lead +2, for tin +4 B)For lead +4, for tin +2 C)For lead +2, for tin +2 D)For lead +4, for tin +4 Q17.Standard entropy of X2, Y2 and XY3 are 60, 40 and 50JK−1mol−1, respectively. For the reaction, X2 + Y2 → XY3, ΔH = 30kJ, to be at equilibrium, the temperature will be  A) K           B)1000 K                               C)750 K                                        D) 500 K Q18. Entropy of the universe is  A)constant B)continuously decreasing C)zero D)continuously increasing Q19-In which of the following process, a maximum increase in entropy is observed?  A) of salt in water B)condensation of water C)sublimation of naphthalene D)melting of ice Q20.ΔHvap = 30 KJ/mole and ΔSvap = 75 Jmol–1K–1. Find temperature of vapour, at one atmosphere  A)400 K                               B)250 K                       C)298 K                        D)350 K