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Arrange the aqueous solutions of the following salts in the increasing order of pH array ccc CuSO ₄ & NaCN & KCl I & II & III array

Options

  1. AI < II < III
  2. BI < III < II
  3. CIII < II < I
  4. DII < III < I

Correct answer

B. I < III < II

Step-by-step solution

NaCN is the salt of strong base ( NaOH ) and weak acid (HCN). So, its pH >7 . CuSO ₄ is a salt of strong acid ( H ₂ SO ₄ ) and a weak base [ Cu ( OH )₂ . , thus its solution is acidic with pH < 7 . KCl is a salt of strong acid ( HCl ) and a strong base [ KOH ] , thus its solution is neutral with pH =7 . Increasing order of pH is array ccc CuSO ₄ & < KCl & < NaCN I & III & II array

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