Which of the following represents correct acidity order Li₂O , BeO and B₂O₃ ?

• Li₂O < BeO < B₂O₃

• B₂O₃ < BeO < Li₂O

• BeO < Li₂O < B₂O₃

• BeO < B₂O₃ < Li₂O

Alkaline earth's metals are denser than alkali metals, because metallic bonding in alkaline earth's metal is

• stronger

• weaker

• volatile

• not present

The incorrect statements among the following is

• the first ionisation potential of Al is less than the first ionisation potential of Mg

• the second ionsiation potential of Mg is lower than the second ionsiation potential of Na

• the first ionisation potential of Na is less than the first ionisation potential of Mg

• the third ionisation potential of Mg is greater than the third ionisation potential of Al

The pairs of compounds which cannot exists together in a solution is

• NaHCO₃ and NaOH

• Na₂CO₃ and NaOH

• Na₂CO₃ and NaHCO₃

• NaHCO₃ and NaCl

Formula of bleaching powder is

• Ca(OH)₂

• CHCl₃

• CCl₃CHO

• CaOCl₂

Setting of plaster of Paris is

• dehydration

• oxidation with atmospheric oxygen

• combination with atmospheric CO₂

• hydration to yield another hydrate

157.

White metal is an alloy of

• Na and Mg

• Na and Pb

• Li and Mg

• Li and Pb

Which one of the following will not give flame test?

• Ca

• Ba

• Sr

• Be

Which alkaline earth metal compound is volatile?

• Mg₃N₂

• Ca₃N₂

• Be₃N₂

• None of the equation

The set representing the right order of ionic radius is

• Li⁺ > Na⁺> Mg²⁺ > Be²⁺

• Mg²⁺ > Be²⁺> Li⁺> Na⁺

• Na⁺> Mg²⁺> Li⁺> Be⁺

• Na⁺> Li⁺> Mg²⁺> Be⁺