19. Which of the following statements represent Raoult's Law
(a) Mole fraction of solvent = ratio of vapour pressure of the solution to vapour pressure of the solvent
(b) Mole fraction of solute = ratio of vapour pressure of the solution to vapour pressure of the solvent
(c) Mole fraction of solute = lowering of vapour pressure of the solution
(d) Mole fraction of solvent = lowering of vapour pressure of the solution
Ans. (a)
20. Elements having the same atomic number and the same atomic mass are known as
(a) Isotopes
(b) Isotones
(c) Isomers
(d) None of the above
21.Which is the most acidic amongst
(a) Nitrophenol
(b) O-toulene
(c) Phenol
(d) Cresol
22. Pure water does not conduct electricity because it is
(a) Almost not ionised
(b) Low boiling
(c) Neutral
(d) Readily decomposed
Ans. (a)
23. In a salt bridge, KCl is used because
(a) It is an electrolyte
(b) The transference number of K+ and Cl¯ is nearly the same
(c) It is a good conductor of electricity
(d) All of the above
Ans. (d)
24. A depolarizer used in the dry cell batteries is
(a) KCl
(b) MnO2
(c) KOH
(d) None of the above
Ans. (b)
25. The hydrolysis of alkyl halides by aqueous NaOH is best termed as
(a) Electrophylic substitution reaction
(b) Electrophylic addition reaction
(c) Nnucleophylic addition reaction
(d) Nucleophylic substitution reaction
Ans. (d)
26. The hydrocarbon that gives a red precipitate with ammoniacal cuprous chloride is (where 'º' means a triple bond)
(a) CH3-CH2-CH2-CH3
(b) CH3-CºC-CH3
(c) CH2=CH-CH=CH2
(d) CH3-CH2-CºCH
Ans. (d)
27. Which of the following reagents is neither neutral nor basic
(a) Lucas' reagent
(b) Tollen's reagent
(c) Bayer's reagent
(d) Fehling's solution
Ans. (a)
28. The substance which is most easily nitrated
(a) Toluene
(b) Bbenzene
(c) Nitrobenzene
(d) Chlorobenzene
Ans. (a)
29. Carbylamine reaction is a test for
(a) Primary amine
(b) Secondary amine
(c) Tertiary amine
(d) Quarternary ammonium salt
Ans. (a)
30. Which of the following oxides cannot be reduced by carbon to obtain metal
(a) ZnO
(b) Al2O3
(c) Fe2O3
(d) PbO
Ans. (b)
31. Which of the following is not an oxide ore?
(a) Cassiterite
(b) Siderite
(c) Pyrolusite
(d) Bauxite
Ans. (b)
32. Which among the following is called philosopher's wool
(a) Cellulose
(b) Calamine
(c) Stellite
(d) Cerussite
Ans. (c)
33. Out of 10 white, 9 black and 7 red balls, in how many ways can we select one or more balls
(a) 234
(b) 52
(c) 630
(d) 879
Ans. (d)
34. A and B throw a dice. The probability that A's throw is not greater than B's is
(a) 5/12
(b) 7/12
(c) 11/12
(d) 5/36
Ans. (b)
35. Given two numbers a and b. Let A denote the single AM between these and S denote the sum of n AMs
between them. Then S/A depends upon
(a) n
(b) n,a
(c) n,b
(d) n,a,b
Ans. (a)
36. If the sum of the roots of the equation ax²+bx+c=0 is equal to the sum of the squares of their reciprocals,
then, a/c, b/a, c/b are in
(a) AP
(b) GP
(c) HP
(d) None of the these
Ans. (c)
In the following questions ~ represents the integral sign-for eg. 1~2[f(x)] means integration of
the function f(x) over the interval 1 to2.
37. Value of -1~2[|2-x²|]dx, ie integration of the function |2-x²| over the interval -1 to 2.
(a) 0
(b) 1
(c) 2
(d) None of the above
Ans. (d)
38. If 0~P[log sinx]dx=k,then the value of 0~P/4[log(1 + tan x)]dx ,where P stands for pi,is
(a) -k/4
(b) k/4
(c) -k/8
(d) k/8
Ans. (c)
39. If a,b,c be in GP and p,q be respectively AM between a,b and b,c then
(a) 2/b=1/p+1/q
(b) 2/b=1/p-1/q
(c) 2=a/p-c/q
(d) None of the above
Ans. (a)
40. A solution of KMnO4 is reduced to MnO2 .The normality of solution is 0.6.The molarity is
(a) 1.8M
(b) 0.6M
(c) 0.1M
(d) 0.2M
Ans. (d)
The questions 41-46 are based on the following pattern.The problems below contain a question and two statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the questions.The correct answer is
(A) If statement (I) alone is sufficient but statement (II) alone is not sufficient.
(B) If statement(II) alone is sufficient but statement(I) alone is not sufficient.
(C) If both statements together are sufficient but neither of statements alone is sufficient.
(D) If both together are not sufficient.
