In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10. pH of the buffer solution is:
| 1. | 10 | 2. | 7 |
| 3. | 6 | 4. | 4 |
The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+is due to:
1. Linkage isomerism
2. Geometrical isomerism
3. Coordination isomerism
4. Ionisation isomerism
Among the given options, what is the property of the alkaline earth metals that increases with their atomic number?
1. Solubility of their hydroxides in water
2. Solubility of their sulphates in water
3. Ionization energy
4. Electro-negativity
During the kinetic study of the reaction, 2A + B\( \rightarrow\)C + D, following results were obtained:
| Run | [A)/ mol L-1 | [B)/ mol L-1 | Initial rate of formation of D/mol L-1 |
| I | 0.1 | 0.1 | \(6.0 \times 10^{- 3}\) |
| II | 0.3 | 0.2 | \(7.2 \times 10^{- 2}\) |
| III | 0.3 | 0.4 | \(2.88 \times \left(10\right)^{- 1}\) |
| IV | 0.4 | 0.1 | \(2.40 \times \left(10\right)^{- 2}\) |
Based on the above data which one of the following is correct?
1. rate= k[A]2[B]
2. rate= k[A][B]
3. rate= k[A]2[B]2
4. rate= k[A][B]2
Which of the following pairs has nearly the same ionic size?
1. Iron(II), Fe²⁺ and nickel(II), Ni²⁺2. Zirconium(IV), Zr⁴⁺ and titanium(IV), Ti⁴⁺
3. Zirconium(IV), Zr⁴⁺ and hafnium(IV), Hf⁴⁺
4. Zinc(II), Zn²⁺ and hafnium(IV), Hf⁴⁺
The correct order of the decreasing ionic radii among the following isoelectronic species is:
1.
2.
3.
4.
In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three?
1.
2.
3.
4.
Standard entropies of X2, Y2 and XY3 are 60, 40 and 50JK-1mol-1 respectively. For the reaction
to be at equilibrium, the temperature should be:
1. 750 K
2. 1000 K
3. 1250 K
4. 500 K
The correct order of increasing electron affinity for the elements, O, S, F and Cl is:
| 1. | Cl < F < O < S | 2. | O < S < F < Cl |
| 3. | F < S < O < Cl | 4. | S < O < Cl < F |
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