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- Question
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
- Correct Answer
- 350
- 1. 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
- 2. 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
- 3. 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
- 4. With rise in pressure, the solubility of gases in solvent, at a fixed temperature
Options- A. increases
- B. decreases
- C. remains unchanged
- D. decreases linearly Discuss
- 5. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
Options- A. same elevation in boiling point.
- B. different elevation in boiling point.
- C. elevation in boiling point in the ratio of their molecular weights.
- D. none of these. Discuss
- 6. 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
- 7. 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
- 8. Average molecular weight of air is about
Options- A. 21
- B. 29
- C. 23
- D. 79 Discuss
- 9. 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
- 10. 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
Stoichiometry problems
Search Results
Correct Answer: forces operative between its molecules are negligible.
Correct Answer: XM ? 0.64
Correct Answer: 0.5
Correct Answer: increases
Correct Answer: same elevation in boiling point.
Correct Answer: Equal volumes of Argon and Krypton contain equal number of atoms.
Correct Answer: 2
Correct Answer: 29
Correct Answer: 8
Correct Answer: 1000
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