The limiting molar conductivities Λ° for NaCl, KBr and KCl are 126, 152 and 150 S cm2 mol-1 respectively. The Λ° for NaBr is

In a cell that utilises the reaction Zn(s) + 2H+ (aq) $$\to$$ Zn2+(aq) + H2(g) addition of H2SO4 to cathode compartment, will

The $$E_{M^{3+}/M^{2+}}^o$$ values for Cr, Mn, Fe and Co are – 0.41, +1.57, + 0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state form +2 to +3 is easiest?

Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is

The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?

The states of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively

Which one of the following has the regular tetrahedral structure? (Atomic nos : B = 5, S = 16, Ni = 28, Xe = 54)

The maximum number of 90° angles between bond pair of electrons is observed in

Identify the correct statements regarding enzymes

Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

Which base is present in RNA but not in DNA?

If A = \left[ {\matrix{ a & b \cr b & a \cr } } \right] and {A^2} = \left[ {\matrix{ \alpha & \beta \cr \beta & \alpha \cr } } \right], then

If $$1,$$ $$\omega ,{\omega }^2$$ are the cube roots of unity, then \Delta = \left| {\matrix{ 1 & {{\omega ^n}} & {{\omega ^{2n}}} \cr {{\omega ^n}} & {{\omega ^{2n}}} & 1 \cr {{\omega ^{2n}}} & 1 & {{\omega ^n}} \cr } } \right| is equal to

If the system of linear equations $$x+2ay+az=0;$$ $$x+3by+bz=0;x+4cy+cz=0;$$ has a non - zero solution, then $$a,b,c$$.

Events $$A,B,C$$ are mutually exclusive events such that P\left( A \right) = {{3x + 1} \over 3}, P\left( B \right) = {{1 - x} \over 4} and P\left( C \right) = {{1 - 2x} \over 2} The set of possible values of $$x$$ are in the interval.

Five horses are in a race. Mr. A selects two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is :

The mean and variance of a random variable $$X$$ having binomial distribution are $$4$$ and $$2$$ respectively, then $$P(X=1)$$ is :