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Frequently Asked IIT-JEE Latest Exam Pattern - IIT-JEE Sample Question with Solutions Page 5

(#M40028122) IIT-JEE QUESTION 2007 Question Keep an EYE

Let a, b, c
be unit vectors such that a + b + c = 0 . Which one of the following is correct?
(A) a × b = b × c = c × a = 0
(B) a × b = b × c = c × a ≠ 0(C) a × b = b × c = a × c = 0
(D) a × b, b × c, c × a are mutually perpendicular

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(#M40027849) IIT-JEE QUESTION 2011 question Keep an EYE

The first ionisation potential of Na is 5.1 eV. The
value of electron gain enthalpy of Na+ will be -
(1) – 10.2 eV (2) + 2.55 eV
(3) – 2.55 eV (4) – 5.1 eV

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(#M40027769) IIT-JEE QUESTION 2011 question Keep an EYE

Passing H2S gas into a mixture of Mn2+, Ni2+, Cu2+ and Hg2+ ions in an acidified aqueous solution
precipitates
(A) CuS and HgS (B) MnS and CuS
(C) MnS and NiS (D) NiS and HgS

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(#M40027948) IIT-JEE QUESTION 2012 question Keep an EYE

The carboxyl functional group (– COOH) is present in
(A) picric acid (B) barbituric acid
(C) ascorbic acid (D) aspirin

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(#M40027922) IIT-JEE QUESTION 2010 question Keep an EYE

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the
mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is
(A) virtual and at a distance of 16 cm from the mirror
(B) real and at a distance of 16 cm from the mirror
(C) virtual and at a distance of 20 cm from the mirror
(D) real and at a distance of 20 cm from the mirror.

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(#M40028130) IIT-JEE QUESTION 2007 Question Keep an EYE

Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5% respectively, the atomic
mass of Fe is
(A) 55.85 (B) 55.95
(C) 55.75 (D) 56.05

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(#M40017966) IIT-JEE QUESTION Arithmetic Progression Keep an EYE

The angles of a quadrilateral are in A.P. and the greatest angle is 120 degree. Express the angles in radians.

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(#M40027766) IIT-JEE QUESTION 2011 question Keep an EYE

The freezing point (in oC) of a solution containing 0.1 g of K3[Fe(CN)6 (Mol. Wt. 329) in 100 g of water
(Kf = 1.86 K kg mol-1) is

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(#M40028013) IIT-JEE QUESTION 2012 Question Keep an EYE

Among the following compounds, the most acidic is
option
(A) p-nitrophenol
(B) p-hydroxybenzoic acid
(C) o-hydroxybenzoic acid
(D) p-toluic acid.

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(#M40027904) IIT-JEE QUESTION 2010 question Keep an EYE

A piece of ice (heat capacity = 2100 J kg–1 º C–1 and latent heat = 3.36 × 105 J kg–1) of mass m grams is at –
5ºC at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally when the ice–
water mixture is in equilibrium, it is found that 1 gm of ice has melted. Assuming there is no other heat
exchange in the process, the value of m is

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