Water - class 9

Water is a universal solvent because it...

• It can be found anywhere
• It freezes when it gets cold
• floats when frozen
• Dissolves most substances

Tags

NGSS.HS-ESS2-5

an efflorescent subsance

• washing soda

• KOH

• FeCl3

• NaOH

Impurities which are deliquescent in common salt

• FeCl3

• CaO

• CuSO4

• MgCl2

Do particles in a true solution settle down

• Yes

• No

Whose solubility increase with increase in temperature

• KNO₃

• Na₂SO₄.10H₂O

• CaSO₄

• KClO₃

Tags

NGSS.HS-PS1-5

What are the examples of drying agents

• CaCl2

• Fused P₂O₅

• KOH

• NaOH

Conc. H2SO4 act as a --------------- when it reacts with sugar

• Drying agent

• Deliquescent

• Dehydrating agent

• Hygroscopic

___________ Substance changes the state

• Drying agent

• Deliquescent

• Dehydrating agent

• Hygroscopic

Hydrated copper sulphate changes to _______ colour on heating

• blue

• yellow

• green

• white

Observation on reaction of sugar with conc.H2SO4

• blue residue

• black residue

• green residue

• white residue