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Consider the reaction A ⇌ B at 1000 K. At time ’, the temperature of the system was increased to 2000 K and the system was allowed to reach equilibrium. Throughout this experiment, the partial pressure of A was maintained at 1 bar.

Given below is the plot of the partial pressure of B with time. What is the ratio of the standard Gibbs energy of the reaction at 1000 K to that... View Article

5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator. The volume of NaOH required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the NaOH solution?

Exp. No. Vol. of NaOH (mL) 1 12.5 2 10.5 3 9.0 4 9.0 5 9.0 Answer: 0.11 H2C2O4 + 2NaOH →... View Article

The cubic unit cell structure of a compound containing cation M and anion X is shown below. When compared to the anion, the cation has a smaller ionic radius. Choose the correct statement(s).

a) The empirical formula of the compound is MX. b) The cation M and anion X have different coordination geometries. c) The ratio of M-X bond... View Article

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).

a) The hypochlorite ion is the strongest conjugate base. b) The molecular shape of only chlorate ion is influenced by the lone pair of electrons... View Article

Choose the correct statement(s) among the following:

a) [FeCl4]− has tetrahedral geometry. b) [Co(en)(NH3)2Cl2]+has 2 geometrical isomers. c) [FeCl4]− has higher spin-only magnetic... View Article

In the reaction scheme shown below, Q, R, and S are the major products.

The correct structure of Answer: b, d... View Article

With respect to the compounds I-V, choose the correct statement(s).

a) The acidity of compound I is due to delocalization in the conjugate base. b) The conjugate base of compound IV is aromatic. c) Compound II... View Article

In thermodynamics, the – work done is given by

. For a system undergoing a particular process, the work done is, This equation is applicable to a a) System that satisfies the van der... View Article

The Fischer projection of D-erythrose is shown below.

D-Erythrose and its isomers are listed as P, Q, R, and S in Column-I. Choose the correct relationship of P, Q, R, and S with D-erythrose from... View Article

Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

Answer: d 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid... View Article

Newman projections P, Q, R and S are shown below:

Which one of the following options represents identical molecules? a) P and Q b) Q and S c) Q and R d) R and S Answer: c... View Article

A colourless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partially soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. NH₃ and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are

a) Ag and Pb b) Ag and Cd c) Cd and Pb d) Cd and Zn Answer: a x = Ag; y = Pb; P = AgCl; Q = PbCl2 (1) AgNO3 + NaCl→AgCl↓ + NaNO3... View Article

Which of the following liberates O₂ upon hydrolysis?

a) Pb3O4 b) KO2 c) Na2O2 d) Li2O2 Answer: b a) Pb3O4 + H2O → No reaction (due to insoluble in water) b) Superoxides liberate oxygen... View Article

If the distribution of molecular speeds of gas is as per the figure shown below, then the ratio of the most probable, the average, and the root mean square speeds, respectively, is

a) 1 : 1 : 1 b) 1 : 1 : 1.224 c) 1 : 1.128 : 1.224 d) 1 : 1.128 : 1 Answer: c The graph represents symmetrical distribution of speed and... 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	31

Archives

Consider the reaction A ⇌ B at 1000 K. At time ’, the temperature of the system was increased to 2000 K and the system was allowed to reach equilibrium. Throughout this experiment, the partial pressure of A was maintained at 1 bar.

The cubic unit cell structure of a compound containing cation M and anion X is shown below. When compared to the anion, the cation has a smaller ionic radius. Choose the correct statement(s).

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).

Choose the correct statement(s) among the following:

In the reaction scheme shown below, Q, R, and S are the major products.

With respect to the compounds I-V, choose the correct statement(s).

In thermodynamics, the – work done is given by

The Fischer projection of D-erythrose is shown below.

Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

Newman projections P, Q, R and S are shown below:

Which of the following liberates O₂ upon hydrolysis?

If the distribution of molecular speeds of gas is as per the figure shown below, then the ratio of the most probable, the average, and the root mean square speeds, respectively, is

02 July 2021: UPSC Exam Comprehensive News Analysis

The area (in sq units) enclosed between the parabola y = x² – x + 2 and the line y = x + 2 equals

The area (in sq units) bounded by the curves 4y = x² and 2y = 6 – x² is

The area bounded by the curve y = 2x – x² and the line y = -x is

The area bounded by the curves y² = 8x and x² = 8y is

The area bounded by the curve y² (2a – x) = x³ and the line x = 2a is

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