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Which of the following oxoanions contains all equivalent M−O bonds?

(A) \(\begin{array}{l}MnO_{4}^{-}\end{array} \) (B) \(\begin{array}{l}CrO_{4}^{2-}\end{array} \) (C) \(\begin{array}{l}Cr_{2}O_{7}^{2-}\end{array} \) (D) Both (A) and (B) The Correct Answer is (D) Both... View Article

Calculate the ratio of energies of 2nd orbits of H, He+ and Li+2.

(A) 1 : 4 : 9 (B) 2 : 4 : 9 (C) 3 : 6 : 9 (D) 4... View Article

Silver crystallises in the fcc lattice. If the edge length of the cell is 4.07 * 10-8 cm and density is 10.5 g cm-3.Calculate the atomic mass of metal.

Solution: As we know: Density (D) =\(\begin{array}{l} \frac{ZM}{N_{0}a^{3}}\end{array} \) Given: Density (D) = 10.5 g cm-3 Number of atoms per... View Article

The molar specific heat at a constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is:

(A) 5/7 (B) 7/5 (C) 8/7 (D) 9/7 The Correct Answer is (B) 7/5 Solution: \(\begin{array}{l} C_{P} = \frac{7}{2} R\\\Rightarrow... View Article

An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be:

(A) Primary amine (B) Secondary amine (C) Tertiary amine (D) All Of These The Correct Answer is (D) All Of... View Article

If a polynomial 2x^2 – 7x-1 is divided by (x + 3), then the remainder is

Let the given polynomial be f(x) =2x2 – 7x – 1 Using the remainder theorem, we can write f(-3) =... View Article

If P(9a−2,−b) divides the line segment joining A(3a+1,−2) and B(8a,5) in the ratio 3:1. Find the value of a and b.

Given that, P divides the line segment AB in the ratio of 3: 1. A (3a+1 , -2) = (x1,... View Article

If the curves ax^2 +4xy+2y^2 +x+y+5=0 and ax^2+6xy+5y^2+2x+3y+8=0 intersect at four con-cyclic points then the value of a is

As we know that, any second degree curve that passes through the intersection of the given curves is ax2 +... View Article

Root 83 simplified

As 83 is not a perfect square, we won’t get the square root of 83 as a whole number. Now,... View Article

Find the missing number in the figure which follows the same pattern

In the figure, 28 = ( 3 + 4 ) × (5 – 3 + 2) Therefore, for the second... View Article

In 1 L saturated solution of AgCl(Ksp AgCl = 1.6 * 10-10), 0.1 mol of CuCl (Ksp CuCl = 1.0 * 10-6) is added. The resultant concentration of Ag+ in the solution is 1.6 * 10-x. Calculate the value of x.

(A) 3 (B) 5 (C) 7 (D) 9 The Correct Answer is (C) 7. Solution: The value of x is... View Article

Which kind of isomerism is exhibited by octahedral [CO(NH3)4 Br2]Cl?

(A) Geometrical isomerism (B) Optical and ionisation isomerism (C) Geometrical and optical isomerism (D) Geometrical and ionisation isomerism The Correct... View Article

Which of the following gas is formed when an acid reacts with a metal carbonate or metal hydrogen carbonate?

(A) Hydrogen (B) Carbon dioxide (C) Carbon monoxide (D) All of the above. The Correct Answer is (B) Carbon dioxide.... View Article

Prove that the relative lowering of the vapour pressure of a solution is equal to the mole fraction of non-volatile solute present in the solution.

Solution: According to Raoult’s law, for dilute solutions containing non-volatile solute, the relative lowering of vapour pressure, \(\begin{array}{l} \frac{\Delta P}{P_{0}}... View Article

The number of Faradays (F) required to produce 20g of Calcium from molten CaCl2 is:

(A) 1 (B) 2 (C) 3 (D) 4 The Correct Answer is (A) 1. Solution: w = Z * Q... View Article

Calculate the percentage of p-character in the orbital occupied by the lone pairs in water molecules : [Given:∠HOH is 104.5∘ and cos (104.5)= − 0.25]

(A) 20% (B) 70% (C) 75% (D) 80% The Correct Answer is (B) 70%. Solution: \(\begin{array}{l} cos \Theta = \frac{-1}{i}\\cos(104.5^{\circ})... View Article

After completion of the reactions (I and II), the organic compound(s) in the reaction mixtures is(are):

(A) Reaction I : P and Reaction II : P (B) Reaction I: T, U, acetone and Reaction II :... View Article

For the reaction 2P + Q = R. 8 mol of P and 5 mol of Q will produce______.

(A) 4 mol of R (B) 5 mol of R (C) 8 mol of R (D) 13 mol of R... View Article

During an adiabatic compression, 830 J of work is done on 2 moles of a diatomic ideal gas to reduce its volume by 50%. The change in its temperature is nearly [R=8.3 JK-1 mol-1] :

(A) 14 K (B) 20 K (C) 33 K (D) 40 K The Correct Answer is (B) 20 K. Solution:... View Article

The speed of sound in hydrogen at NTP is 1270ms-1. Then the speed in a mixture of hydrogen and oxygen in the ratio 4:1 by volume will be:

(A) 371 ms-1 (B) 380 ms-1 (C) 635 ms-1 (D) 950 ms-1 The Correct Answer is (C) 635 ms-1 Solution:... View Article

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