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JEE Main 20209 JanuaryEvening Shift
Exam
JEE Main
Year
2020
Date
9 January
Shift
Evening Shift
Subject
Chemistry
Chapter
s Block Elements

JEE Main 2020 · 9 January · Evening Shift · Chemistry · s Block Elements

Among the statements (a) - (d), the correct ones are: ( a ) Lithium...

Among the statements (a)−(d),\left(a\right) - \left(d\right), the correct ones are:
(a)( a ) Lithium has the highest hydration enthalpy among the alkali metals.
(b)( b ) Lithium chloride is insoluble in pyridine.
(c)( c ) Lithium cannot form ethynide upon its reaction with ethyne.
(d)( d ) Both lithium and magnesium react slowly with H2O{H}_{2}O .

Options

  1. A(a),(b)( a ) , ( b ) and (d)( d ) only
  2. B(a),(c)( a ) , ( c ) and (d)( d ) only
  3. C(b)( b ) and (c)( c ) only
  4. D(a)( a ) and (d)( d ) only

Correct answer

B. (a),(c)( a ) , ( c ) and (d)( d ) only

Step-by-step solution

Lithium has highest hydration enthalpy among
alkali metals due to its small size.
LiCl is soluble in pyridine because LiCl have
more covalent character.
Li does not form ethynide with ethyne.
Both Li and Mg reacts slowly with H2O{\text{H}}_{\text{2}} \text{O}
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