KVPY Government Jobs Exams

The maximum number of structural isomers possible for the hydrocarbon having the molecular formula C4H6, is
option
(A) 12
(B) 3
(C) 9
(D) 5

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KVPY Other Question

An aqueous buffer is prepared by adding 100 ml of 0.1 mol l-1 acetic acid to 50 ml of 0.2 mol l-1 of sodium acetate. If pKa of acetic acid is 4.76, the pH of the buffer is
option
(A) 4.26
(B) 5.76
(C) 3.76
(D) 4.76 Among (i) [CO(NH3)6]Cl3, (ii) [Ni(NH3)6]Cl2, (iii) [Cr(H2O)6]Cl3, (iv) [Fe(H2O)6]Cl2 the complex which is diamagnetic is
option
(A) i
(B) ii
(C) iii
(D) iv