csir net life science

If pH of solution of NaOH is 12.0 the pH of H2 SO4 solution of same molarity will be

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If pH of solution of NaOH is 12.0 the pH of H2 SO4 solution of same molarity will be (1) 2.0 (3) 1.7 (2) 12.0 (4) 10.0387

A 10 N HCI solution was diluted 10-fold with water and the pH of the diluted solution was measured with a pH meter after calibration using standard solutions. Given that the activity coefficient for diluted HCI was 0.01, the pH of the solution would be

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A 10 N HCI solution was diluted 10-fold with water and the pH of the diluted solution was measured with a pH meter after calibration using standard solutions. Given that the activity coefficient for diluted HCI was 0.01, the pH of the solution would be (1) 0 (3) 2 (2) 1 (4) 2.5

The pka of acetic acid is 4.76. At what pH would the concentration of acetic acid and acetate ion be the same?

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The pka of acetic acid is 4.76. At what pH would the concentration of acetic acid and acetate ion be the same? (1) pH = 7 (3) pH = 9.8 (2) pH = 6.7 (4) pH = 4.76

Which one of the following amino-containing buffering molecules will be the most able to resist change in pH when in a pH 7.0 solution at a total (ionized and non-ionic) concentration of 100mM?

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Which one of the following amino-containing buffering molecules will be the most able to resist change in pH when in a pH 7.0 solution at a total (ionized and non-ionic) concentration of 100mM? (1) Tris (pKa = 8.1) (3) MOPS {pKa = 7.3} (2) HEPES (pKa = 7.7) (4) PIPES (pKa = 7.1) Concept: Best … Read more

While making 100 ml of 2M NaCl solution, a student left the solution on a heating platform reducing the volume by 50 ml. This solution was diluted 1:100 for use. What is the final concentration of NaCl in this solution?

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While making 100 ml of 2M NaCl solution, a student left the solution on a heating platform reducing the volume by 50 ml. This solution was diluted 1:100 for use. What is the final concentration of NaCl in this solution? (1) 20 mM (3) 40 mM (2) 80 mM (4) 400 mM

A TE buffer contains 200 mM Tris and 50 mM EDTA. Given the stock solutions-0.5 M Tris and 0.5 M EDTA, volumes of stock solutions required to make 1 liter of buffer solution are respectively.

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A TE buffer contains 200 mM Tris and 50 mM EDTA. Given the stock solutions-0.5 M Tris and 0.5 M EDTA, volumes of stock solutions required to make 1 liter of buffer solution are respectively. (1) 400 ml, 100 ml (3) 500 ml, 125 ml (2) 200 ml, 50 ml (4) 100 ml, 25 ml

Two solutions of a substance (non-electrolyte) are mixed in the following manner: 480 ml of 1.5 M first solution+ 520 ml of 1.2 M second solution. What is the molarity (M) of the final mixture?

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Two solutions of a substance (non-electrolyte) are mixed in the following manner: 480 ml of 1.5 M first solution+ 520 ml of 1.2 M second solution. What is the molarity (M) of the final mixture? (1) 1.250 (3) 1.433 (2) 1.344 (4) 1.479

If the intracellular pH of a cell becomes basic, which one of the following will help reduce the pH?

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If the intracellular pH of a cell becomes basic, which one of the following will help reduce the pH? (1) Export of Cl and import of HCO (2) Import of Cl and export of HCO (3) Import of Na” and HCO3- and export of Cl (4) Export of Na’ and Cl If the intracellular pH … Read more

If the pH of a solution goes from 8 to 7, this means that the hydrogen ion concentration has:

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If the pH of a solution goes from 8 to 7, this means that the hydrogen ion concentration has: (1) decreased by 1 mole/liter. (2) increased by 1 mole/liter. (3) decreased 10 fold. (4) increased 10 fold The pH scale is logarithmic, meaning that a decrease of 1 unit in pH corresponds to a 10-fold … Read more