Question Text
Question 1 :
State whether 'passing of electric current through water and water breaking down into hydrogen and oxygen gases' is chemical or physical change.
Question 4 :
What type of mixtures are separated by the technique of crystallisation?
Question 5 :
State whether 'burning of paper and wood' is chemical or physical change.
Question 6 :
Classify whether the following is element, compound or mixture: Carbon dioxide
Question 7 :
State whether 'making a fruit salad with raw fruits' is chemical or physical change.
Question 10 :
To make a saturated solution 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Question 13 :
State whether 'melting of butter in a pan' is chemical or physical change.
Question 15 :
How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than $25^\circ$C), which are miscible with each other?
Question 16 :
State whether 'dissolving common salt in water' is chemical or physical change.
