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Which of the following is a correct order of atomic sizes: Ce (58), Sn (50), Yb (70) and Lu (71)?

(A) Sn > Lu > Yb > Ce (B) Ce > Sn > Yb > Lu (C) Ce > Sn > Yb > Lu (D) Lu > Ce > Sn > Yb The Correct... View Article

The calculated spin only magnetic moment of Cr2+ ion is

(A) 2.84BM (B) 3.87BM (C) 4.90BM (D) 5.92BM The Correct Answer is (C) 4.90BM Solution: Electronic configuration of the Cr2+ ion is 1s2... View Article

Which of the following ions is responsible for the brown colour in the ring test for nitrate?

(A) [Fe(NO2)6]4- (B) [Fe(H2)5NO2]+ (C) [Fe(CN)5NO2]- (D) [Fe(H2O)5NO]2+ The Correct Answer is (D) [Fe(H2O)5NO]2+ Solution:... View Article

Element A has 3 electrons in the outermost orbit and element B has 6 electrons in the outermost orbit. The formula of the compound formed A and B would be:

(A) A2B (B) A2B2 (C) A2B3 (D) A3B6 The Correct Answer is (C) A2B3 Solution: In a neutral molecule, the sum of the bonding valance electrons... View Article

Which of the following statements is wrong?

(A) Van der Waal's radius of iodine is more than its covalent radius. (B) The first ionisation energy of nitrogen is higher than that of... View Article

Which of the following statement is incorrect for the isoelectronic species?

(A) Isoelectronic species have the same number of electrons (B) Isoelectronic species have different numbers of protons (C) In isoelectronic... View Article

In CH3CH2OH, the bond that undergoes heterolytic cleavage most readily is:

(A) O - H (B) C - O (C) C - H (D) C - C The Correct Answer is (A) O - H Solution: In CH3CH2OH, the electronegativity order is H <... View Article

The orbital angular momentum of an electron in a 3d-subshell is:

(A) Zero (B) (C) (D) The Correct Answer is (D) Solution: The orbital angular momentum of an electron in 3d-subshell is For a given... View Article

What is the final product obtained when chlorine reacts with ethyl alcohol in KOH?

(A) CH2Cl (B) CH3Cl (C) CHCl3 (D) CCl3CHO The Correct Answer is (C) CHCl3 Solution: When chlorine reacts with ethyl alcohol in the presence... View Article

The atomic number of sodium is 11. The four quantum numbers of the electron having the highest energy are:

(A) n = 1, l = 1 , ml = 0, ms = + (B) n = 4, l = 2 , ml = 1, ms = - (C) n = 3, l = 0 , ml = 0, ms = + (D) NoneOf These. The Correct... View Article

On burning NH3 in the presence of oxygen gives:

(B) N2 and H2O (C) NO and H2O (D) NO2 and H2O The Correct Answer is (C) NO and H2O. Solution: Therefore, burning NH3 in the presence of... View Article

Ethylene oxide when treated with Grignard reagent yields:

(A) Primary alcohol (B) Secondary alcohol (C) Tertiary alcohol (D) Cyclopropyl alcohol The Correct Answer is (A) Primary alcohol.... View Article

Which among the following is a colourless paramagnetic gas?

(A) Nitric oxide (B) Nitrous oxide (C) Nitrogen oxide (D) Dinitrogen trioxide The Correct Answer is (A) Nitric oxide. Solution:... View Article

the rate of a particular reaction doubles when the temperature changes from 300 k to 310 k. calculate the energy of activation of the reaction. [given r = 8.314 jk−1 mol−1 ]

From Arrhenius equation, log k2/k1 = −Ea/2.303R(1/T2−1/t1) Given, k2/k1 = 2T2 = 310K T1 = 300K On putting values, ⇒ log2 =... View Article

relation between specific heat and degree of freedom

The ratio of specific heats ( γ ) of gas is given by γ = CP/CV Where, CP is the specific heat at constant pressure CV is the specific heat at... View Article

which energy state of doubly ionised lithium has same energy as that of first excitation state of hydrogen? (given z for lithium = 3)

We, know total energy of electron in nth orbit E∝Z2/n2 As [E]Li=[E]H (Z2/n2)Li = (Z2/n2)H Therefore, 9/n2 = 1/1 or n2 = 9 or n = 3 Again radius... View Article

In which of the following carbocation, there is maximum stabilisation due to hyperconjugation effect? neopentyl, tert-Butyl, isopropyl, ethyl

neopentyl tert-Butyl isopropyl ethyl Answer: Tert-Butyl (CH3)3C+ has the maximum number of 9 α-hydrogens and hence most useful in... View Article

major products obtained when n-hexane is heated in the presence of anhydrous alcl3 and hcl gas are

When n-Hexane is heated with anhydrous AlCl3 and HCl gas the major product obtained is mixture of 2-methylpentane and 3-methylpentane.... View Article

the dissociation constant of a monobasic acid is and the molar conductivity at infinite dilution is . the specific conductance of the 0.01 m acid solution is

ka=1.69×10−5 Cα2=0.01α2 α=0.04 α=λM/(λ∞M⇒λM=0.04×380) λM=15.2Scm2mole−1 λM=k×1000/M 15.2=k×1000/0.01 k=1.52×10−4Scm−1 k=1.52×10−2Sm−1... View Article

A square current-carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is [latex]vec{F}[/latex], the net force on the remaining three arms of the loop is

a) 3 b) - c) -3 d) Answer: b) - Solution: The force on the two arms parallel to the field is zero. Therefore, Force on remaining... View Article

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