Chemical Properties and General Characteristics of Alkali Metals
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CHXI10:THE S-BLOCK ELEMENTS

315752 When sodium reacts with excess of oxygen, oxidation number of oxygen changes from

1 0 to -1
2 0 to -2
3 -1 to -2
4 +1 to -1
CHXI10:THE S-BLOCK ELEMENTS

315753 Alkali metals when exposed to air tanish quickly due to the

1 Formation of their hydroxides
2 Formation of their carbonates
3 Formation of their oxides
4 All the above
CHXI10:THE S-BLOCK ELEMENTS

315754 Sodium peroxide in contact with moist air turns white due to the formation of

1 \(\mathrm{Na}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{NaHCO}_{3}\)
4 \(\mathrm{NaOH}\)
CHXI10:THE S-BLOCK ELEMENTS

315755 Assertion :
Superoxides of alkali metals are diamagnetic.
Reason :
Superoxides contain the ion \(\mathrm{O}_{2}^{-}\)which has one unpaired electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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CHXI10:THE S-BLOCK ELEMENTS

315752 When sodium reacts with excess of oxygen, oxidation number of oxygen changes from

1 0 to -1
2 0 to -2
3 -1 to -2
4 +1 to -1
CHXI10:THE S-BLOCK ELEMENTS

315753 Alkali metals when exposed to air tanish quickly due to the

1 Formation of their hydroxides
2 Formation of their carbonates
3 Formation of their oxides
4 All the above
CHXI10:THE S-BLOCK ELEMENTS

315754 Sodium peroxide in contact with moist air turns white due to the formation of

1 \(\mathrm{Na}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{NaHCO}_{3}\)
4 \(\mathrm{NaOH}\)
CHXI10:THE S-BLOCK ELEMENTS

315755 Assertion :
Superoxides of alkali metals are diamagnetic.
Reason :
Superoxides contain the ion \(\mathrm{O}_{2}^{-}\)which has one unpaired electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
NEET DIGITAL LIBRARY
CHXI10:THE S-BLOCK ELEMENTS

315752 When sodium reacts with excess of oxygen, oxidation number of oxygen changes from

1 0 to -1
2 0 to -2
3 -1 to -2
4 +1 to -1
CHXI10:THE S-BLOCK ELEMENTS

315753 Alkali metals when exposed to air tanish quickly due to the

1 Formation of their hydroxides
2 Formation of their carbonates
3 Formation of their oxides
4 All the above
CHXI10:THE S-BLOCK ELEMENTS

315754 Sodium peroxide in contact with moist air turns white due to the formation of

1 \(\mathrm{Na}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{NaHCO}_{3}\)
4 \(\mathrm{NaOH}\)
CHXI10:THE S-BLOCK ELEMENTS

315755 Assertion :
Superoxides of alkali metals are diamagnetic.
Reason :
Superoxides contain the ion \(\mathrm{O}_{2}^{-}\)which has one unpaired electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Join With Us for More Updates
CHXI10:THE S-BLOCK ELEMENTS

315752 When sodium reacts with excess of oxygen, oxidation number of oxygen changes from

1 0 to -1
2 0 to -2
3 -1 to -2
4 +1 to -1
CHXI10:THE S-BLOCK ELEMENTS

315753 Alkali metals when exposed to air tanish quickly due to the

1 Formation of their hydroxides
2 Formation of their carbonates
3 Formation of their oxides
4 All the above
CHXI10:THE S-BLOCK ELEMENTS

315754 Sodium peroxide in contact with moist air turns white due to the formation of

1 \(\mathrm{Na}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{NaHCO}_{3}\)
4 \(\mathrm{NaOH}\)
CHXI10:THE S-BLOCK ELEMENTS

315755 Assertion :
Superoxides of alkali metals are diamagnetic.
Reason :
Superoxides contain the ion \(\mathrm{O}_{2}^{-}\)which has one unpaired electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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