Archives

The major product formed in the following reaction is:

1) CH3CH(Br)CH2CH(CH3)2 2) CH3CH2CH2C(Br)(CH3)2 3) CH3CH2CH(Br)CH(CH3)2 4) Br(CH2)3CH(CH3)2 Answer: (1) Option 1 is the answer.... View Article

Using the provided information in the following paper chromatogram:

Using the provided information in the following paper chromatogram: The calculated Rf value of A ______ × 10–1. Answer: 4 On... View Article

1 molal aqueous solution of an electrolyte A₂B₃ is 60% ionised. The boiling point of the solution at 1 atm is _____ K.

Answer: 375 K A2B3 → 2A+3 + 3B–2 No. of ions = 2 + 3 = 5 wi = 1 + (n – 1) ∝ = 1 + (5 – 1) × 0.6 = 1 + 4 ×... View Article

Among the following, the number of halide(s) which is/are inert to hydrolysis is ______

a. BF3 b. SiCl4 c. PCl5 d. SF6 Answer: 1 Due to crowding, SF6 is not hydrolyzed.... View Article

A car tire is filled with nitrogen gas at 35 psi at 27°C. It will burst if pressure exceeds 40 psi. The temperature in °C at which the car tyre will burst is ______. (Rounded-off to the nearest integer)

Answer: 69.85°C ≃ 70°C P1 / T1 = P2 / T2 35 / 300 = 40 / T2 T2 = 40 × 300 / 35 = 342.86 K = 69.85°C ≃ 70°C... View Article

Consider the following chemical reaction.

Consider the following chemical reaction. The number of sp2 hybridized carbon atom(s) present in the product is _______. Answer: 7 All carbon... View Article

The ionization enthalpy of Na⁺ formation from Na_(g) is 495.8 kJ mol^–1, while the electron gain enthalpy of Br is –325.0 kJ mol^–1. Given the lattice enthalpy of NaBr is –728.4 kJ mol^–1. The energy for the formation of NaBr ionic solid is (–)_____ × 10^–1 kJ mol^–1

Answer: 5576 kJ Na(s) → Na+(g) ΔH = 495.8 ½ Br2(λ) + e– → Br–(g) ΔH = 325 Na+(g) + Br–(g)... View Article

0.4g mixture of NaOH, Na₂CO₃ and some inert impurities was first titrated with N / 10HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of the same HCl was required for the next end point. The weight percentage of Na₂CO₃ in the mixture is ______. (Rounded-off to the nearest integer)

Answer: 3% 1st end point reaction NaOH + HCl → NaCl + H2O nf = 1 NaCO3 + HCl → NaHCO3 nf = 1 Eq of HCl used = nNaOH × 1 + nNa2CO3... View Article

For the reaction, aA + bB → cC + dD, the plot of log k vs 1/T is given below:

The temperature at which the rate constant of the reaction is 10–4s–1 is ________ K. [Rounded off to the nearest integer) [Given: The rate... View Article

In basic medium CrO₄^2– oxidizes S₂O₃^2– to form SO²₄ and itself changes into Cr(OH)₄^–. The volume of 0.154 M CrO₄^2– required to react with 40 mL of 0.25 M S₂O₃^2– is ______ mL. (Rounded-off to the nearest integer)

Answer: 173 mL 17H2O + 8CrO4 + 3S2O3 → 6SO4 + 8Cr(OH)4– + 2OH– Applying mole-mole analysis 0.154 × v / 8 = 40 × 0.25... View Article

The solubility of AgCN in a buffer solution of pH = 3 is x. The value of x is: [Assume: No cyano complex is formed; K_sp(AgCN) = 2.2 × 10^–16 and K_a (HCN) = 6.2 × 10^–10]

a. 0.625 × 10-6 b. 1.6 × 10-6 c. 2.2 × 10-16 d. 1.9 × 10-5 Answer: (d) Let solubility be x AgCN ⇌ Ag+ + CN–Ksp = 2.2 × 10–16 H+ + CN– ⇌... View Article

Identify A and B in the chemical reaction.

Identify A and B in the chemical reaction. Answer: (d) Hence d is the answer... View Article

The hybridization and magnetic nature of [Mn(CN)₆]^4– and [Fe(CN)₆]^3–, respectively are:

a. d2sp3 and paramagnetic b. sp3d2 and paramagnetic c. d2sp3 and diamagnetic d. sp3d2 and diamagnetic Answer: (a) Hence the answer is (a)... View Article

Which of the following reaction/s will not give p-amino azobenzene?

Which of the following reaction/s will not give p-amino azobenzene? a. 2 only b. 1 and 2 c. 3 only d. 1 only Answer: (a) Hence the answer is... View Article

Which one of the following reactions will not form acetaldehyde?

Which one of the following reactions will not form acetaldehyde? Answer: (a) Hence Option a is the correct answer... View Article

Which of the glycosidic linkage galactose and glucose is present in lactose?

a. C-1 of glucose and C-6 of galactose b. C-1 of galactose and C-4 of glucose c. C-1 of glucose and C-4 of galactose d. C-1 of galactose and C-6... View Article

The plots of radial distribution functions for various orbitals of hydrogen atom against ‘r’ are given below:

The correct plot for 3s orbital is a. (4) b. (2) c. (1) d. (3) Answer: (a) 3s orbital Number of radial nodes = n – λ – 1 For... View Article

Given below are two statements: Statement-I: An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement-II: Gases such as oxides of nitrogen and Sulphur present in the troposphere contribute to the formation of photochemical smog.

a. Statement I and Statement II are true b. Statement I is true about Statement II is false c. Both Statement I and Statement II are false d.... View Article

Which statement is correct?

a. Buna-S is a synthetic and linear thermosetting polymer b. Neoprene is an addition copolymer used in plastic bucket manufacturing c.... View Article

In which of the following pairs, the outermost electronic configuration will be the same?

a. Fe2+ and Co+ b. Cr+ and Mn2+ c. Ni2+ and Cu+ d. V2+ and Cr+ Answer: (b) Cr+ → Ar]3d5 Mn2+ → [Ar]3d5... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28	29	30