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- Question
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
- Correct Answer
- 8
- 1. Average molecular weight of air is about
Options- A. 21
- B. 29
- C. 23
- D. 79 Discuss
- 2. Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm.
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 3. Pick out the wrong statement.
Options- A. Heat capacity of a diatomic gas is higher than that of a monoatomic gas.
- B. Equal volumes of Argon and Krypton contain equal number of atoms.
- C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023.
- D. The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture Discuss
- 4. A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
Options- A. 350
- B. 485
- C. 140
- D. 345 Discuss
- 5. An ideal gas can be liquified, because
Options- A. its molecular size is very small.
- B. its critical temperature is more than 0°C.
- C. forces operative between its molecules are negligible.
- D. it gets solidified directly without becoming liquid. Discuss
- 6. 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
- 7. Increasing the temperature of an aqueous solution will cause decrease in its
Options- A. molality
- B. mole fraction
- C. weight percent
- D. molarity Discuss
- 8. 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
- 9. 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 Discuss
- 10. 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
Stoichiometry problems
Search Results
Correct Answer: 29
Correct Answer: 2
Correct Answer: Equal volumes of Argon and Krypton contain equal number of atoms.
Correct Answer: 350
Correct Answer: forces operative between its molecules are negligible.
Correct Answer: 1000
Correct Answer: molarity
Correct Answer: the number of neutrons present in it.
Correct Answer: none of these
Correct Answer: x1/x2
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