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- Question
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
- Correct Answer
- 2
- 1. 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
- 2. 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
- 3. 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
- 4. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies
Options- A. XM < 0.5
- B. XM = 0.5
- C. 0.5 < XM < 0.64
- D. XM ? 0.64 Discuss
- 5. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is
Options- A. 2
- B. 1
- C. 0.5
- D. 0.5 Discuss
- 6. Average molecular weight of air is about
Options- A. 21
- B. 29
- C. 23
- D. 79 Discuss
- 7. 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
- 8. 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
- 9. Increasing the temperature of an aqueous solution will cause decrease in its
Options- A. molality
- B. mole fraction
- C. weight percent
- D. molarity Discuss
- 10. 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
Stoichiometry problems
Search Results
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: XM ? 0.64
Correct Answer: 0.5
Correct Answer: 29
Correct Answer: 8
Correct Answer: 1000
Correct Answer: molarity
Correct Answer: the number of neutrons present in it.
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