When we heat the sugar what change will occur?
Chemical
Physical
Both a and b
None of these
In which change no new substance is formed ?
Both a & b
Reaction between iodine and phosphorous is taken place by which method?
Heating
Mixing
Light
Electricity
Which change is permanent not easiliy reversible?
Permanent
Irreversible
Conversion of milk to curd is a _________ change
Which depend on the composition or change in composition of a substance?
physical properties
Chemical properties
Density
Melting point
Which can be determined by simple physical observations and measured without changing the composition of the substance?
Physical properties
Chemicalpropertics
Composition
Concentration
Energy is either absorbed or evolved during ________________ change.
Temporary
Reversible
Which change is temporary and easily reversible?
Burning of paper is a ___________ change.
