E-PolyLearning

1. The nucleus of an atom consists of
a. electrons and neutrons
b. electrons and protons
c. protons and neutrons
d. All of the above
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Answer: (c).protons and neutrons

2. The number of moles of solute present in 1 kg of a solvent is called its
a. molality
b. molarity
c. normality
d. formality
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Answer: (a).molality

3. The most electronegative element among the following is
a. sodium
b. bromine
c. fluorine
d. oxygen
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Answer: (c).fluorine

4. The metal used to recover copper from a solution of copper sulphate is
a. Na
b. Ag
c. Hg
d. Fe
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Answer: (d).Fe

5. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
a. p-electrons in Ne(Z = 10)
b. s-electrons in Mg(Z = 12)
c. d-electrons in Fe(Z = 26)
d. p-electrons in CI(Z = 17)
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Answer: (d).p-electrons in CI(Z = 17)

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