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... View Article
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The orbital angular momentum of an electron in a 3d-subshell is:
(A) Zero (B)\(\begin{array}{l} \frac{h}{2\Pi} \end{array} \) (C) \(\begin{array}{l}\frac{h}{4\Pi} \end{array} \) (D) \(\begin{array}{l}\frac{\sqrt{6}h}{2\Pi} \end{array} \) The Correct Answer is (D)\(\begin{array}{l} \frac{\sqrt{6}h}{2\Pi}... 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... 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 = +\(\begin{array}{l}\frac{1}{2}\end{array} \) (B) n = 4, l... 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.... 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. Solution:... 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, ⇒... 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... 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... 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 explaining... 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.
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
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\(\begin{array}{l}\vec{F}\end{array} \) b) -\(\begin{array}{l}\vec{F}\end{array} \) c) -3\(\begin{array}{l}\vec{F}\end{array} \) d) \(\begin{array}{l}\vec{F}\end{array} \) Answer: b) -\(\begin{array}{l}\vec{F}\end{array} \) Solution: The force on... View Article
Find the potential drop across 4μF capacitor and 6Ω resistor in figure.
a) 0,0 b) 0, 3V c) 0, 2V d) 2V, 0 Answer: d) 2V, 0 Solution: A fully charged capacitor draws... View Article
In a transformer, the output current and voltage are respectively 4 A and 20V. If the ratio of number of turns in the primary to secondary is 2:1 what is the input current and voltage?
Answer:2 A Solution: (Ns/Np) = (Ip/Is) = (Vs/Vp) Vp = Vi = (Np/Ns) x Vs = (2/1) x 20 =... View Article
In the circuit shown in figure, the current measured by the ammeter is
a) 1 A b) 2 A c) 3 A d) Zero Answer: c) 3 A Solution: From the graph √(100 –... View Article
If the angular velocity of a disc depends on an angle rotated as ω=(θ2+θ), then its angular acceleration at θ=1 rad is
a) 3 rad/s2 b) 6 rad/s2 c) 2 rad/s2 d) 9 rad/s2 Answer: a) 3 rad/s2 Solution: Given, ω=(θ2+θ) Angular acceleration, α =... View Article
A magnetic compass needle oscillates 30 times per minute at a place where the dip is 45°, and 40 times per minute where the dip is 30º. If B1 and B2 are respectively the total magnetic field due to the earth at the two places, then the ratio B1/ B2 is best given by:
(1) 1.8 (2) 2.2 (3) 0.7 (4) 3.6 Answer: (3) 0.7 Solution: \(\begin{array}{l}\tau = \vec{m}\times \vec{B}\end{array} \) τ = -mBsinθ τ... View Article
The magnetic flux linked with a coil of N turns of the area of cross-section A held with its plane parallel to the field B is
a) NAB/2 b) NAB c) NAB/4 d) 0 Answer: d) 0 Solution: Φ = NBAcosθ = NBAcos 900 = 0
