A blue solid T, which weigh 5.0g was placed on a table. After 8 hours, the resulting pink solid was found to weight 5.5g. It can be inferred that substance T

 A blue solid T, which weigh 5.0g was placed on a table. After 8 hours, the resulting pink solid was found to weight 5.5g. It can be inferred that substance T 

A. is deliquescent

B. is hygroscopic 

C. has some molecules of water of crystallization

D. is efflorescent 

The correct is B is hygroscopic

Explanation:

The mass of the solid increased from 5.0 g to 5.5 g, and its colour changed from blue to pink after exposure to air.

This shows that the substance absorbed moisture from the air.

Let’s check the options:

• A. Deliquescent → absorbs moisture and dissolves ❌ (it remained a solid)

• B. Hygroscopic → absorbs moisture from air without dissolving ✅

• C. Has some molecules of water of crystallization → this describes the hydrated form, not the property being tested ❌

• D. Efflorescent → loses water and decreases in mass ❌

(The colour change is typical of substances like anhydrous cobalt(II) chloride turning pink when hydrated.)

✅ Correct Answer: B. is hygroscopic

QUESTION FOURTEEN