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- Question
Which of the following is an exothermic reaction?
Options- A. Conversion of graphite to diamond
- B. Decomposition of water
- C. Dehydrogenation of ethane to ethylene
- D. none of these
- Correct Answer
- none of these
- 1. The chemical nature of an element is independent of
Options- A. its atomic number.
- B. the number of protons or electrons present in it.
- C. the number of neutrons present in it.
- D. none of these. Discuss
- 2. Increasing the temperature of an aqueous solution will cause decrease in its
Options- A. molality
- B. mole fraction
- C. weight percent
- D. molarity Discuss
- 3. If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times.
Options- A. 10
- B. 100
- C. 1000
- D. 10000 Discuss
- 4. 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
Options- A. 6
- B. 8
- C. 10
- D. 12 Discuss
- 5. Average molecular weight of air is about
Options- A. 21
- B. 29
- C. 23
- D. 79 Discuss
- 6. A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to
Options- A. x1/x2
- B. x2/x1
- C. 1 - (x1/x2)
- D. 1/x2 Discuss
- 7. Gases having same reduced temperatures and reduced pressures
Options- A. deviate from ideal gas behaviour to the same degree.
- B. have nearly the same compressibility factor.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
- 8. The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour
Options- A. measures the elevation in boiling point.
- B. is not dependent on the temperature.
- C. is a function of the liquid phase composition.
- D. measures the depression in freezing point. Discuss
- 9. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
Options- A. 1/9
- B. 8/9
- C. 1/2
- D. 5/9 Discuss
- 10. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
Options- A. 10.73 kJ
- B. 16.15 kJ
- C. 18.11 kJ
- D. 18.33 kJ Discuss
Stoichiometry problems
Search Results
Correct Answer: the number of neutrons present in it.
Correct Answer: molarity
Correct Answer: 1000
Correct Answer: 8
Correct Answer: 29
Correct Answer: x1/x2
Correct Answer: both (a) and (b).
Correct Answer: is a function of the liquid phase composition.
Correct Answer: 8/9
Correct Answer: 18.11 kJ
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