MEDIUM
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Find the number of elements having lower than .
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Important Questions on Classification of Elements and Periodicity in Properties
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In which of the following, elements are arranged in the correct order of their electron gain enthalpies.
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The correct order of first electron affinity of and is
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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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Within each pair of elements and , and , and and , respectively, the elements that release more energy upon an electron gain are
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Which of the following reactions does not involve absorption of energy?
I.
II.
III.
IV.
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The difference between electron gain enthalpies will be maximum between :
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What is the correct oder of electron gain enthalpy of
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Identify the element that forms amphoteric oxide:
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Which of the following elements has the most negative electron gain enthalpy?
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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 formation of the oxide ion, , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:
Thus process of formation of in gas phase is unfavourable though is isoelectronic with neon. It is due to the fact that,
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The option(s) with only amphoteric oxides is(are):
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For electron gain enthalpies of the elements denoted as , the incorrect option is :
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The correct order of atomic radii in group elements is
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In general, the properties that decrease and increase down a group in the periodic table, respectively, are :
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For and , the correct order of increasing ionic radii is:
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Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements?
a. Nitrogen
b. Phosphorous
c. Chlorine
d. Fluorine
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The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :
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When the first electron gain enthalpy of oxygen is , its second electron gain enthalpy is:
