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Chemistry Questions

Question 221:

In the preparation of ammonia, which of the following is used as the drying agent?

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A CaO
B CaCI<sub style='font-size: smaller;'>2</sub>
C Conc. H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
D P<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>5</sub>
E H<sub style='font-size: smaller;'>3</sub>PO<sub style='font-size: smaller;'>4</sub>

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Question 222:

Which of the following can have an isomer?

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A C<sub style='font-size: smaller;'>2</sub>H<sub style='font-size: smaller;'>4</sub>
B C<sub style='font-size: smaller;'>4</sub>H<sub style='font-size: smaller;'>10</sub>
C C<sub style='font-size: smaller;'>3</sub>H<sub style='font-size: smaller;'>8</sub>
D C<sub style='font-size: smaller;'>2</sub>H<sub style='font-size: smaller;'>6</sub>
E C<sub style='font-size: smaller;'>6</sub>H<sub style='font-size: smaller;'>6</sub>

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Question 223:

Allotropes are elements having?

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A Different physical but the same chemical properties
B Different chemical but the same physical properties
C The same chemical and physical properties
D Different atomic structure
E The same position in the periodic table

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Question 224:

A polymerization reaction is one in which?

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A Small molecules form giant molecules
B Atoms form molecules
C Giant molecules form small molecules
D Molecules form volatile compounds
E A molecule rearranges itself

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Question 225:

Which of the following is the electronic configuration of sodium? <br/>(Atomic number of Na = 11)

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A 1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup> 3s<sup style='font-size: smaller;'>2</sup>
B 1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup> 3s<sup style='font-size: smaller;'>2</sup> 3p1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup> 3s<sup style='font-size: smaller;'>1</sup>
C 1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup> 3s<sup style='font-size: smaller;'>1</sup>
D 1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup> 3s<sup style='font-size: smaller;'>°</sup>
E 1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup> 4s<sup style='font-size: smaller;'>1</sup>

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