121. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is
N₂O₄
N₂O₅
N₂O₃
None of these
✅ The correct answer is option B.
Statiometery MCQs
122. pH value of an alkaline solution is
7
> 7
< 7
Constant over a wide range
✅ The correct answer is option B.
123. The average translational kinetic energy with which a gas molecule is endowed is dependent on its
Nature
Size
Absolute temperature
All of the above
✅ The correct answer is option C.
124. Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is
80.1°C
Less than 80.1°C
100°C
Greater than 80.1°C but less than 100°C
✅ The correct answer is option D.
125. The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________
1026
1023
1020
1019
✅ The correct answer is option C.
126. Percentage saturation of a vapor bearing gas is always __________ the relative saturation.
Higher than
Smaller than
Equal to
Either A or B; depends on the system
✅ The correct answer is option B.
127. The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the
Phase rule
Experimental data
Emperical equations
Theoretical equations
✅ The correct answer is option A.
128. For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction)
Δ H
>ΔH
<ΔH
0
✅ The correct answer is option B.
129. A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of
3
100
1000
None of these
✅ The correct answer is option C.
130. 1 BTU/ft³ is approximately equal to __________ kcal/m³.
1
9
4
252
✅ The correct answer is option B.