Salt of thiosulphruic acid is sodium thiosulphate which is used in

• Photography for fixing

• Submarines

• Space capsules

• Petroleum refining

Na₂S₂O₃ + I₂ $\to$ Product is

• Na₂S

• Na₂SO₄

• Na₂S₄O₆

• S₂

On dissolving moderate amount of sodium metal in liquid NH, at low temperature, which one the following does not occur?

• Na⁺ ions are formed in the solution

• Blue coloured solution is obtained

• Liquid NH₃ becomes good conductor of electricity.

• Liquid ammonia remains diamagnetic

NaOH / H⁺ reacts with

• C₆H₅OCH₃

• CH₃OH

• CH₃COCH₃

• C₂H₅OH

Which of the following alkaline earth metal oxides shows a coordination number four?

• BeO

• MgO

• SrO

• CaO

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

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