Identify the reactants (R) and product (P) in a typical fuel cell.
| 1. | R = H2(g), O2(g); P = H2O2(l) |
| 2. | R = H2(g), O2(g); P = H2O(l) |
| 3. | R = H2(g), O2(g), C l2(g); P = HClO4(aq) |
| 4. | R = H2(g), N2(g); P = NH3(aq) |
What does ZAB represent in the collision theory of chemical reactions?
| 1. | The fraction of molecules with energies greater than Ea |
| 2. | The collision frequency of reactants, A and B |
| 3. | Steric factor |
| 4. | The fraction of molecules with energies equal to Ea |
Which of the following statement is not true about glucose?
1. It is an aldohexose.
2. It contains five hydroxyl groups.
3. It is a reducing sugar.
4. It is an aldopentose.
The potential energy (y) curve for H2 formation as a function of internuclear distance (x) of the H atoms is shown below.
The bond energy of H2 is:
| 1. | (b – a) | 2. | \(\dfrac{\left(\right. c - a \left.\right)}{2}\) |
| 3. | \(\dfrac{\left(\right. b - a \left.\right)}{2}\) | 4. | (c – a) |
The reactant 'A' in the below-mentioned reaction is:
| 1. | Benzoyl chloride | 2. | Toluene |
| 3. | Acetophenone | 4. | Benzoic acid |
Consider the given compound:
In the given options, the following for the above compound are, respectively:
(i) sp2 hybridised carbon atoms
(ii) bonds
| 1. | 7, 5 | 2. | 8, 6 |
| 3. | 7, 6 | 4. | 8, 5 |
At standard conditions, if the change in the enthalpy for the following reaction is –109 kJ mol–1
H2(g)+Br2(g)2HBr(g) and the bond energy of H2 and Br2 is 435 kJ mol–1 and 192 kJ mol–1 respectively, what is the bond energy (in kJ mol–1) of HBr?
| 1. | 368 | 2. | 736 |
| 3. | 518 | 4. | 259 |
The minimum pressure required to compress 600 dm3 of a gas at 1 bar to 150 dm3 at 40°C is
1. 4.0 bar
2. 0.2 bar
3. 1.0 bar
4. 2.5 bar
Among the role of gypsum, CaSO4.2H2O in the setting of cement, identify the correct option from the following:
1. It fastens the setting process
2. It provides water molecules for the hydration process
3. It helps to remove water molecules
4. It slows down the setting process
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