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Chemistry Test ...

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  • Question 1
    1 / -0

    Calculate the ratio of \(\mathrm{HCOO}^{-}\) and \(\mathrm{F}^{-}\) in a mixture of \(0.2 \mathrm{M} \mathrm{HCOOH}\left(\mathrm{K}_{\mathrm{g}}=2 \times 10^{-4}\right)\) and \(0.1 \mathrm{M} \mathrm{HF}\left(\mathrm{K}_{\mathrm{a}}=6.6 \times 10^{-4}\right):\)

  • Question 2
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    Which of the following is soluble in water?

  • Question 3
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    When gold is dissolved in aqua - regia which of the following is formed :

  • Question 4
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    When the applied voltage is 10,000 V, the de-Broglie wavelength of an electron is (Planck’s constant: h = 6.626 × 10–34 Js , Mass of electron me : = 9. 1 × 10–31Kg)

  • Question 5
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    Among the electrolytes Na2SO4 CaCl2, Al2 (SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is

  • Question 6
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    Wave number of a spectral line for a given transition is x cm–1 for He+, then its value for Be3+ (isoelectronic of He+) for same transition is :

  • Question 7
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    When salicylic acid is heated with acetic anhydride, we get :

  • Question 8
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    The percentage dissociation of a 0.011 m aqueous solution of K3[Fe(CN)6] which freezes at - 0.063oC is (Kf for water = 1.86oC m-1)

  • Question 9
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    The compressibility  of a gas is less than unity at STP.
    Therefore,

  • Question 10
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    An acid-base indicator which is a weak acid has a pKa value=5.35. At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half-way between those of its acid and conjugate base forms? pKa of acetic acid =4.75. [log2=0.3].

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