321. Which of the following is an exothermic reaction?
Conversion of graphite to diamond
Decomposition of water
Dehydrogenation of ethane to ethylene
None of these
✅ The correct answer is option D.
Statiometery MCQs
322. At room temperature, the product [H⁺] [OH⁻] in a solution is 10⁻¹⁴ moles/litre. If, [OH⁻] = 10⁻⁶ moles/litre, then the pH of the solution will be
6
8
10
12
✅ The correct answer is option B.
323. On mixing 56 gm of CaO with 63 gm of HNO₃, the amount of Ca(NO₃)₂ formed is __________ gm.
82
164
41
8.2
✅ The correct answer is option A.
324. Total energy at a point comprises of __________ energy.
Potential & kinetic
Pressure
Internal
All of the above
✅ The correct answer is option D.
325. The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.
Less than
More than
Equal to
Either more or less; depends on the solvent
✅ The correct answer is option A.
327. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
Potential energy
Intermolecular forces
Kinetic energy
Total energy
✅ The correct answer is option C.
328. The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.
9.03
3.01
1.204
6.02
✅ The correct answer is option A.
329. Number of gm moles of solute dissolved in 1 kg of solvent is called its
Normality
Molarity
Molality
Formality
✅ The correct answer is option C.
330. 500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be __________ mm Hg.
650
700
600
375
✅ The correct answer is option A.