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Which of the compound gives the most stable carbonium ion on dehydration?

(A) CH3OH (B) CH3CHO (C) (CH3)3COH (D) CH2 = CH – CH2CH2OH The Correct Answer is (C) (CH3)3COH. Solution: The... View Article

Alkyl halides though polar are immiscible with water because:

(A) To break the hydrogen bonds between the water molecules (B) The molecules of water are held together by Hydrogen... View Article

The longest wavelength present in the Balmer series of hydrogen is:

(A) 6524 \(\begin{array}{l}A^{\circ}\end{array} \) (B) 6556 \(\begin{array}{l}A^{\circ}\end{array} \) (C) 6563 \(\begin{array}{l}A^{\circ}\end{array} \) (D) 6663 \(\begin{array}{l}A^{\circ}\end{array} \) The Correct Answer is... View Article

Which of the following statements is true about the perhydrol?

(A) It is a 30 per cent H2O2 solution. (B) It is a strong oxidising agent used as a ripening... View Article

The work function of some metals is listed below. How many of these metals show the photoelectric effect when the light of 300 nm wavelength falls on them?

Metal K Na Li Mg Ag Fe W Cu Pt ϕ (eV) 2.2 2.3 2.4 3.7 4.3 4.7 4.75... View Article

Which of the following has pseudo inert gas configuration?

(A) K+ (B) S–2 (C) Cu+ (D) Na+ The Correct Answer is (C) Cu+ Solution: An element has 18 electrons... View Article

Which among the following compound is the strongest base?

(A) C6H5NH2 (B) C6H5CH2NH2 (C) p-NH2C6H4NH2 (D) m-NO2C6H4NH2 The Correct Answer is (B) C6H5CH2NH2 Solution: C6H5CH2NH2 – Benzylamine is the... View Article

Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, the number of atoms of nitrogen in one molecule of caffeine is:

(A) 2 (B) 3 (C) 4 (D) 6 The Correct Answer is (C) 4 Solution: As given in the question,... View Article

Water softening by Clark’s process uses:

(A) Potash Alum (B) Calcium hydroxide (C) Sodium bicarbonate (D) Calcium bicarbonate The Correct Answer is (B) Solution: Calcium hydroxide... View Article

Which of the following statement is true about the Lattice?

(A) It is a regular repeated three-dimensional arrangement of atoms (B) It is a series of points that are arranged... View Article

Which has the maximum number of molecules?

(A) 2gH2 (B) 7gN2 (C) 16gO2 (D) 16gNO2 The Correct Answer is (A) 2gH2 Solution: (A) 2gH2 The number of... View Article

Which of the following is diamagnetism?

(A) Quartz (B) Nickel (C) Bismuth (D) Aluminium The Correct Answer is (C) Bismuth Solution: Bismuth is a naturally diamagnetic... View Article

The value of [latex](z+3)(bar{z}+3)[/latex] is equivalent to

Solution: Let z = x+iy Then \(\begin{array}{l}\bar{z}=x-iy\end{array} \) \(\begin{array}{l}(z+3)(\bar{z}+3)\end{array} \) = (x+iy+3)(x-iy+3) = (x+3+iy)(x+3-iy) = (x+3)2 – (iy)2 = (x+3)2... View Article

Find prime factorisation of 5929

Solution: 5929 prime factorisation steps are given below. The first step is to divide the number 5929 with the smallest... View Article

Let f(x) be a non-negative continuous function such that the area bounded by the curve y = f(x), x-axis and the ordinates x = π/4 and x = β > π/4 is (β sin β + (π/4) cos β + √2β). Then f(π/2) is

Solution: Given ∫π/4β f(x) dx = (β sin β + (π/4) cos β + √2β Differentiate both sides w.r.t.β f(β)... View Article

The angle bisector of a triangle divides the opposite side into two parts proportional to the other two sides of the triangle. Prove it.

Solution: Let ABC be the triangle. AD is the internal bisector of ∠BAC which meets BC at D. We have... View Article

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