pressure inside the gas jar is greater than pressure outside it
the air in the gas jar had been used up by burning
oxygen in the gas jar had been used up by burning
nitrogen in the gas jar had been used up by burning
the temperature in the jar had risen considerably
Correct answer is C
No explanation has been provided for this answer.
in the beaker
in the conical flask
in a burette
in the standard flask
in the measuring cylinder
Correct answer is B
Add a few drops of indicator and put the conical flask on a white tile. Fill the burette with acid and note the starting volume. Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
potassium nitrate
sand
lead nitrate
sugar (glucose)
starch
Correct answer is B
Use enough water to completely submerge the sand-salt mixture. Stir or shake the mixture for a few minutes so that the salt dissolves in the water.
The sand is insoluble, so it will remain visible.
Which of the following changes is physical?
Adding iron filing to aerated water
Adding sodium metal to water
Cooling a solution of Iron (II) sulphate to obtain the hydrated salt
Cooling water to obtain ice
Burning the domestic gas (Utilgas) for cooking
Correct answer is D
No explanation has been provided for this answer.
dilute sulphuric acid
dilute hydrochloric acid
unreacted hydrogen sulphide in water
iron (III) chloride
Iron (II) chloride
Correct answer is E
No explanation has been provided for this answer.