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Periodic Classification of Elements and Periodicity - Set 4
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NUST Entrance Test
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Chemistry
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Periodic Classification of Elements and Periodicity
Set 4
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Mashaal Masha
Oct 20, 2022
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Choose the correct options for the following questions.
Variable valency is shown by which of the following elements?
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Difficulty: Easy
A:
Na
B:
Co
C:
Mg
D:
Al
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Which one of the following is acidic?
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Difficulty: Easy
A:
$\rm{B(OH)_{3}}$
B:
$\rm{Ca(OH)_{2}}$
C:
$\rm{Mg(OH)_{3}}$
D:
$\rm{NaOH}$
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