Subject :NSO Class : Class 6
Sonali mixed a packet of salt in a small amount of sand and then tried to recover the salt by the usual processes of sedimentation, decantation or filtration followed by evaporation. To her surprise, she could recover only a small part of the salt that she had taken. The possible reasons could be
I. Salt also got evaporated along with water.
II. The quantity of salt was much more than that required to form a saturated solution.
III. The undissolved salt remained mixed with sand.
IV. The quantity of water taken was insufficient to dissolve all the salt.
AII and III only
BI and IV only
CII, III and IV only
DAll of these.
Ans 1:
Class : Class 6
lol
Ans 2:
Class : Class 5