Practice Questions

Q52.The colour of KMnO4 is due to: [where M → metal, L → ligand] (1) σ −σ* transition (2) M →L charge transfer transition (3) d −d transition (4) L →M charge transfer transition

Q52.Which of the following compounds has a P −P Bond? (1) (HPO3)3 (2) H4P2O6 (3) H4P2O7 (4) H4P2O5

Q52.An aqueous solution of a salt X turns blood red on treatment with SCN− and blue on treatment with K4[Fe(CN)6] , X also gives a positive chromyl chloride test. The salt X is: (1) FeCl3 (2) Fe(NO3)3 (3) CuCl2 (4) Cu(NO3)2

Q53.The number of geometric isomers that can exist for square planar [Pt(Cl)(py)(NH3)(NH2OH)]+ is (py = pyridine): (1) 6 (2) 2 (3) 3 (4) 4

Q53.Which of the following statements is/are false? (1) Na2Cr2O7 is more soluble than K2Cr2O7 . (2) CrO2−4 is tetrahedral in shape. (3) Na2Cr2O7 is the primary standard in volumetry. (4) Cr2O2−7 has a Cr −O −Cr bond.

Q54.Which of the following complex ions has electrons that are symmetrically filled in both t2g and eg orbitals? (1) [Co(NH3)6]2+ (2) [Mn(CN)6]4− (3) [CoF6]3− (4) [FeF6]3−

Q55.When concentrated HCl is added to aqueous solution of CoCl2 , its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in reaction? (1) [CoCl6]4− (2) [CoCl6]3− (3) [Co(H2O)6]2+ (4) [CoCl4]2−

Q55. A is : JEE Main 2015 (10 Apr Online) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.Which compound would give 5−keto −2−methyl hexanal upon ozonolysis? JEE Main 2015 (04 Apr) JEE Main Previous Year Paper (1) (2) (3) (4)

Q56.In the following sequence of reactions: KMnO4 SOCl2 H2/ Pd −−−Toluene → A → B → C BaSO4 The Product C is: (1) C6H5CHO (2) C6H5COOH (3) C6H5CH3 (4) C6H5CH2OH

Q56.What is the major product expected from the following reaction? Where D is an isotope of hydrogen. (1) (2) (3) (4)

Q57.The correct order of basicity is (1) (2) (3) (4)

Q57.In the reaction, The product E is JEE Main 2015 (04 Apr) JEE Main Previous Year Paper (1) (2) (3) (4)

Q57.In the reaction sequence OH− −2CH3CHO → A Δ→ B ; the product B is: JEE Main 2015 (11 Apr Online) JEE Main Previous Year Paper (1) CH3 −CH = CH −CHO (2) (3) CH3 −CH2 −CH2 −CH3 (4) CH3 −CH2 −CH2 −CH2 −OH

Q61.Let α and β be the roots of equation x2 −6x −2 = 0 . If an = αn −βn, ∀ n ≥1, then the value of a10−2a8 is 2a9 equal to (1) −3 (2) 6 (3) −6 (4) 3 is

Q62.A complex number z is said to be unimodular if |z| = 1 . Let z1 and z2 are complex numbers such that z1−2z2 2−z1 z 2 unimodular and z2 is not unimodular, then the point z1 lies on a (1) circle of radius √2 (2) straight line parallel to x-axis (3) straight line parallel to y-axis (4) circle of radius 2

Q62.If the two roots of the equation, (a −1) (x4 + x2 + 1) + (a + 1)(x2 + x + 1) 2 = 0 are real and distinct, then the set of all values of a is equal to (1) (0, 12 ) (2) (−12 , 0) ∪(0, 12 ) (3) (−∞, −2) ∪(2, ∞) (4) (−12 , 0)

Q62.If 2 + 3i is one of the roots of the equation 2x3 −9x2 + kx −13 = 0, k ∈R, then the real root of this equation (where i2 = −1) : (1) Exists and is equal to 1 (2) Does not exist 2 (3) Exists and is equal to 1 (4) Exists and is equal to −12

Q63.The number of integers greater than 6000 that can be formed, using the digits 3, 5, 6, 7 and 8 , without repetition is (1) 72 (2) 216 (3) 192 (4) 120

Q63.The number of ways of selecting 15 teams from 15 men and 15 women, such that each team consists of a man and a woman is (1) 1960 (2) 15! (3) (15!)2 (4) 14!

Q64.The value of ∑30r=16(r + 2)(r −3) is equal to: (1) 7775 (2) 7785 (3) 7780 (4) 7770

Q64.The number of points, having both co-ordinates as integers, that lie in the interior of the triangle with vertices (0, 0), (0, 41) and (41, 0) is JEE Main 2015 (04 Apr) JEE Main Previous Year Paper (1) 780 (2) 901 (3) 861 (4) 820

Q64.Let A = {x1, x2, … , x7} and B = {y1, y2, y3} be two sets containing seven and three distinct elements respectively. Then the total number of functions f : A →B that are onto, if there exist exactly three elements x in A such that f(x) = y2, is equal to: (1) 12 ⋅7 C2 (2) 16 ⋅7 C3 (3) 14 ⋅ 7C3 (4) 14 ⋅7 C2

Q65.Let the sum of the first three terms of an A.P. be 39 and the sum of its last four terms be 178. If the first term of this A.P. is 10, then the median of the A.P. is : (1) 26. 5 (2) 29. 5 (3) 28 (4) 31

Q65.Let A and B be two sets containing four and two elements respectively. Then the number of subsets of the set A × B, each having at least three elements is (1) 510 (2) 219 (3) 256 (4) 275