Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202324 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
24 January
Shift
Evening Shift
Subject
Chemistry
Chapter
s Block Elements

JEE Main 2023 · 24 January · Evening Shift · Chemistry · s Block Elements

Identify the correct statements about alkali metals. A. The order...

Identify the correct statements about alkali metals.

A. The order of standard reduction potential (M+∣M)( {M}^{+} | M ) for alkali metal ions is Na>Rb>LiNa > Rb > Li.

B. CsICsI is highly soluble in water.

C. Lithium carbonate is highly stable to heat.

D. Potassium dissolved in concentrated liquid ammonia is blue and paramagnetic.

E. All alkali metal hydrides are ionic solids.

Choose the correct answer from the options given below

Options

  1. AA, B, D only
  2. BC and E only
  3. CA and E only
  4. DA, B and E only

Correct answer

C. A and E only

Step-by-step solution

A. Electrode potential of given elements are:

Li=−3.04Na=−2.714Rb=−2.98Li = - 3 . 04Na = - 2 . 714Rb = - 2 . 98

The standard reduction potentials (E) of the alkali metals do not follow the trend based on ionisation energies. Unexpectedly, lithium is the strongest reductant, and sodium is the weakest. Therefore, reducing character sequences is Na<Rb<Li.Na < Rb < Li .

B. The low solubility of CsICsI is due to smaller hydration enthalpy of its two ions.

C. Li2CO3{Li}_{2}{CO}_{3} decomposes readily to lithium monoxide and carbon dioxide.

D. Alkali metals are sodium, potassium which with liquid ammonia produce blue coloured solutions. Alkali metals dissolve in liquid ammonia to produce ammoniated electrons. It is paramagnetic due to the presence of unpaired electrons.

E.All the alkali metal hydrides are ionic solids with high melting points.

Hence, the correct option is A and E

Practice s Block Elements on Quantrex Academy →

More from s Block Elements

First and second ionization enthalpies of lithium are 520 kJ mol ^ -1 and 7297 kJ mol ^… JEE Main 2026The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides… JEE Main 2026Given below are two statements: One is labelled as Assertion A and the other is labelled… JEE Main 2023Be ( OH ) _ 2 reacts with Sr ( OH ) _ 2 to yield an ionic salt. Choose the incorrect… JEE Main 2023In the given reaction cycle X, Y and Z respectively are JEE Main 2023The density of alkali metals is in the order JEE Main 2023Alkali metal from the following with least melting point is JEE Main 2023Mg ( NO _ 3 ) _ 2 . XH _ 2 O and Ba ( NO _ 3 ) _ 2 . YH _ 2 O , represent formula of the… JEE Main 2023 Full s Block Elements list All JEE Main PYQs