If the density of lake water is 1.25 g mL–1 and contains 92 g of Na+ ions per kg of water, then the molality of Na+ ions will be:
1. | 3.24 molal | 2. | 4 molal |
3. | 5 molal | 4. | 3.5 molal |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe partial pressure of ethane over a solution containing 6.56 × 10–2 g of ethane is 1 bar. If the solution contains 5.00 × 10–2 g of ethane, the partial pressure of the gas will be:
1. 0.66 bar
2. 0.96 bar
3. 0.76 bar
4. 0.19 bar
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN will be:
1. 1.424%
2. 4.424%
3. 5.124%
4. 2.124%
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyNalorphene (C19H21NO3), similar to morphine, is used to combat withdrawal symptoms in narcotic users. The dose of nalorphene generally given is 1.5 mg.
Calculate the mass of 1.5 × 10−3m aqueous solution required for the above dose.
1. 13.22 g
2. 3.22 g
3. 11.22 g
4. 9.22 g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution in methanol is:
1. | 4.57 g | 2. | 3.57 g |
3. | 1.57 g | 4. | 12.57 g |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHenry’s law constant for the solution of methane in benzene at 298 K is 4.27 × 105 mm Hg. The mole fraction of methane in benzene at 298 K under 760 mm Hg will be:
1. 1.85 × 10–5
2. 192 × 10–4
3. 178 × 10–5
4. 18.7 × 10–5
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe major component of air is nitrogen with approximately 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K. if the Henry’s law constant for nitrogen at 298 K is 6.51 × 107 mm respectively, then the composition of nitrogen in air will be :
1. 12.4 × 10−5
2. 9.22 × 10−5
3. 3.54 × 10−5
4. 4.96 × 10−5
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTo minimize the painful effects accompanying deep sea diving, oxygen diluted with less soluble helium gas is used as breathing gas by the divers. This is an example of the application of:
1. | Raoult's law | 2. | Henry's law |
3. | Ideal gas Equation | 4. | All of the above |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. | \(\text X_{\text{mole fraction}}=\frac{\text n_{\text{solute}}}{\text n_{\text{solution}}}\) |
2. | \(\text{Molarity}=\frac{\text{amount of solute (g)}}{\text{volume of solution (mL)}}\) |
3. | \(\text{Molality}=\frac{\text{Number of mole of solute}}{\text{amount of solvent (kg)}}\) |
4. | \(\text{Mass percentage}=\frac{\text{mass of the component in the solution}}{\text{Total mass of the solution}}\times100 \) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe density of 68 % nitric acid by mass in an aqueous solution is 1.504 g mL–1. The molarity of the acid solution would be:
1. 15.24 M
2. 16.23 M
3. 14.52 M
4. 13.45 M
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology