EASY
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What is the value of electron gain enthalpy of ?
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Important Questions on Classification of Elements and Periodicity in Properties
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The metal that forms nitride by reacting directly with of air is:
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When the first electron gain enthalpy of oxygen is , its second electron gain enthalpy is:
MEDIUM
A metal on combustion in excess air forms . upon hydrolysis with water yields and along with another product. The metal is:
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The main oxides formed on combustion of Li, Na and K in excess of air are respectively:
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The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :
MEDIUM
Identify the weakest oxidizing agent among the following
HARD
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?
(A) and
(B) and
(C) and
(D) and
Choose the correct answer from the options given below:
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The oxide of potassium that does not exist is
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The first electron affinity of and will be of the order
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The absolute value of the electron gain enthalpy of halogens satisfies:
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The correct order of hydration enthalpies of alkali metal ions is:
MEDIUM
Which of the following reactions does not involve absorption of energy?
I.
II.
III.
IV.
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On combustion of and in excess of air, the major oxides formed, respectively, are:
MEDIUM
Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:
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The correct order of mobility of alkali metal ions in aqueous solution is-
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When sodium metal is dissolved in liquid ammonia , it imparts a blue colour to the solution. This blue coloration is due to:
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The order of stability for the super oxides is
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What is the correct oder of electron gain enthalpy of
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Which of the following elements has the most negative electron gain enthalpy?
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Within each pair of elements and , and , and and , respectively, the elements that release more energy upon an electron gain are
