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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

02 July 2021: UPSC Exam Comprehensive News Analysis

CNA 02nd July 2021:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related EDUCATION 1. In last academic year, only 22% schools had... View Article

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

1) 8/3 2) 1/3 3) 2/3 4) 4/3 Solution: (4) 4/3... View Article

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

1) 8 2) 6 3) 4 4) 10 Solution: (1) 8... View Article

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

1) 3/2 sq units 2) 9/3 sq units 3) 9/2 sq units 4) None of these Solution: (3) 9/2 sq units... View Article

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

1) 64 sq units 2) 64/3 sq units 3) 8/3 sq units 4) None of these Solution: (2) 64/3 sq units... View Article

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

1) 3πa2 sq units 2) 3πa2/2 sq units 3) 3πa2/4 sq units 4) 6πa2/5 sq units Solution: (2) 3πa2/2 sq units... View Article

The area bounded by the curves y² = 4a² (x – 1) and lines x = 1 and y = 4a is

1) 4a2 sq units 2) 16a/3 sq units 3) 18a/3 sq units 4) None of these Solution: (2) 16a/3 sq units y2 = 4a2 (x - 1) ⇒ (y -... View Article

The area enclosed between the curve y = 1 + x², the y-axis and the straight line y = 5 is given by

1) 14/3 sq units 2) 7/3 sq units 3) 5 sq units 4) 16/3 sq units Solution: (4) 16/3 sq units... View Article

The area bounded by y = sin^-1 x, x = 1 / √2 and x-axis is

1) [(1 / √2) + 1] square units 2) [1 - (1 / √2)] square units 3) (π / 4√2) square units 4) [(π / 4 √2) + (1 / √2) - 1] square units... View Article

The area of the region bounded by y = 2x – x² and the x-axis is

1) 8/3 sq units 2) 4/3 sq units 3) 7/3 sq units 4) 2/3 sq units Solution: (2) 4/3 sq units The given curve is y = 2x - x2... View Article

The area bounded by the curve y = 1/2 x², the X-axis and the line x = 2 is

1) 1/3 sq units 2) 2/3 sq units 3) 1 sq units 4) 4/3 sq units Solution: (4) 4/3 sq units... View Article

Area bounded by the lines y = x, x = -1, x = 2 and x-axis is

1) 5/2 sq units 2) 3/2 sq units 3) 1/7 sq units 4) None of the above Solution: (1) 5/2 sq units... View Article

The area bounded by the curve x = 4 – y² and the y-axis is

1) 16 sq units 2) 32 sq units 3) 32/3 sq units 4) 16/3 sq units Solution: (3) 32/3 sq units... View Article

Area enclosed by the curve π[4(x – √2)² + y²] = 8 is

1) π sq units 2) 2 sq units 3) 3π sq units 4) 4 sq units Solution: (4) 4 sq units... View Article

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