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Chemistry Past Questions

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3771

A solution X, on mixing with AgNO\(_3\) solution gives a white precipitate soluble in aqueous NH\(_3\), a solution Y, when also added to X, also gives a white precipitate which is soluble when heated solutions X and Y respectively contain

  • A. Al\(^{3+}\), Cl\(^-\)
  • B. Hg\(^+\), SO\(_4 ^{2-}\)
  • C. Pb\(^{2+}\), Cl\(^-\)
  • D. Ag\(^+\), SO\(_4 ^{2-}\)
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3772

How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?

  • A. none
  • B. 6
  • C. 7
  • D. 8
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3773

An element Z contains 80% of \(^{16} _8\)Z and 20% of \(^{18} _8\)Z. Its relative atomic mass is

  • A. 16.2
  • B. 17.6
  • C. 16.0
  • D. 16.4
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3774

When the end alkyl groups of ethyl ethanoate are interchanged, the compound formed is

  • A. propylmethanoate
  • B. ethylpropanoate
  • C. methyl ethanoate
  • D. methyl propanoate
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3775

The part of the total energy of a system that accounts for the useful work done in a system is known as

  • A. Enthalpy change
  • B. None of the above
  • C. Gibb's free energy
  • D. Entropy
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