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The compound that has the largest H–M–H bond angle (M=N, O, S, C) is:

1) CH4 2) H2S 3) NH3 4) H2O Answer: (1) CH4 has the largest H-M-H bond angle.... View Article

Adsorption of a gas follows Freundlich adsorption isotherm

Adsorption of a gas follows Freundlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorbent, the correct plot of... View Article

Among the following compounds, geometrical isomerism

Among the following compounds, geometrical isomerism is exhibited by: Answer: (1 and 2)... View Article

The following molecule acts as an:

1) Anti-histamine 2) Antiseptic 3) Anti-depressant 4) Anti-bacterial Answer: (1) Bromopheniramine acts as an Anti-histamine.... View Article

Boron and silicon of very high purity can be obtained through:

1) Liquation 2) Electrolytic refining 3) Zone refining 4) Vapour phase refining Answer: (3) Boron and silicon of very high purity can be... View Article

Hydrogen peroxide, in the pure state, is:

1) Linear and blue in color 2) Linear and almost colorless 3) Non-planar and almost colorless 4) Planar and blue in color Answer: (3) H2O2... View Article

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

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