The order of solubility of lithium halides in non-polar solvents follows the order:

• LiI > LiBr > LiCl > LiF

• LiF > LiI > LiBr > LiCl

• LiCl > LiF > LiI > LiBr

202.

Which of the following is used as a source of oxygen in space capsules , submarines and breathing masks?

• Li₂O

• Na₂O₂

• KO₂

• K₂O₂

Sodium pyrophosphate is represented by which of the following formula?

• Na₂P₂O₄

• Na₄P₂O₅

• Na₄P₂O₇

• Na₂P₂O₅

Assertion : The carbonate of lithium decomposes easily on heating to form lithium oxide and CO₂.

Reason : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li₂O and CO₂.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

Which is maximum hydrated ?

• NaCl

• MgCl₂

• AlCl₃

• SiCl₄

Which salt on heating, does not give brown gas on heating ?

• LiNO₃

• AgNO₃

• Pb(NO₃)₂

• KNO₃

When magnesium is heated , the another compound formed with MgO is :

• Mg₃N₂

• Mg(NO₃)₂

• MgCO₃

• Mg(NO₃)₃

The prefix word 'alkali' for alkaline metals shows :

• lustre of silver

• ashes of plant

• metallic nature

• active metal

Potassium nitrate is called :

• Mohr's salt

• Chile salt petre

• Indian salt petre

• Gypsum

KMnO₄ in alkaline medium changes to

• Mn³⁺

• MnO₂

• MnO${}_4^{2-}$

• Mn(OH)${}_4^{-}$