RRB Group D 23-Oct-2018 Shift 3 Solved Paper

Question : 20 of 100

Marks: +1, -0

Mendeleev could not assign a correct position to which of the following elements in his table?

Hydrogen
Potassium
Lithium
Helium

Solution:

Mandeleev could not assign a correct position to Hydrogen because:
(i) Hydrogen has properties similar to alkali metals (sodium, potassium,lithium).It reacts with chlorine to form HCl. Even

{Na}

, K, Li react with

{Cl}

to form

{NaCl}, {KCl}

{LiCl}

respectively. All have similar general formula (RCl).
(ii) Hydrogen also has similar properties as that of halogens

({Cl}, {F}, {Br})

. Like halogens hydrogen is diatomic element.

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