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Which of the following statements is correct?
- a)The pH of one litre solution containing 0.49 g of H2SO4 is 2.0.
- b)The conjugate base of H2S is S2-.
- c)BF3 is a Lewis base.
- d)Phenolphthalein is colourless in basic medium.
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Which of the following statements is correct?a)The pH of one litre sol...
In 1 L solution of H2SO4,
Therefore, [H+] = 10-2
Therefore, [H+] = 10-2
pH = -log 10-2 = 2
Hence, option (1) is correct.
All the other options are incorrect.
The conjugate base of H2S is HS-.
BF3 is a Lewis acid.
Phenolphthalein is pink in basic medium.
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Community Answer
Which of the following statements is correct?a)The pH of one litre sol...
Explanation:
pH of one litre solution containing 0.49 g of H2SO4 is 2.0:
- The molar mass of H2SO4 is 98 g/mol.
- Number of moles of H2SO4 in 0.49 g = 0.49 g / 98 g/mol = 0.005 mol.
- H2SO4 is a strong acid and completely dissociates in water to produce 2H+ ions.
- Therefore, the concentration of H+ ions in the solution = 2 * 0.005 mol / 1 L = 0.01 M.
- pH = -log[H+], so pH = -log(0.01) = 2.0.
- Hence, the statement is correct.
Incorrect statements:
- The conjugate base of H2S is S2- (This is incorrect. The conjugate base of H2S is HS-).
- BF3 is a Lewis base (This is incorrect. BF3 is a Lewis acid).
- Phenolphthalein is colorless in basic medium (This is incorrect. Phenolphthalein turns pink in basic medium).
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Which of the following statements is correct?a)The pH of one litre solution containing 0.49 g of H2SO4is 2.0.b)The conjugate base of H2S is S2-.c)BF3is a Lewis base.d)Phenolphthalein is colourless in basic medium.Correct answer is option 'A'. Can you explain this answer?
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