Rama heated a mixture of iron filings and sulphur in a hard glass test tube for some time till a grey-black product was formed. She cooled the test tube and then added 2 mL carbon disulphide in it and shook the contents of the test tube.
The observation made by her was likely to be as shown above.
Important Questions on Multiple Choice Questions
Four students A, B, C and D observed the colour and solubility of iron, sulphur and iron sulphide in carbon disulphide. The tick mark (✓) represents 'soluble', and the cross mark (X) represents 'insoluble, in carbon disulphide. Their observations are tabulated below.
The correct observation has been reported by the student:
Which of the following is the correct set-up of apparatus to separate common salt and sand by filtration process?
A student was asked by the teacher to separate sand from a mixture of sand and common salt, while using the set-up of apparatus as shown alongside. In which positions labelled A, B, C and D, would he find sand and common salt respectively?
The experimental mixture of sand, common salt and ammonium chloride was given to four students. They added water to the given sample, stirred it well and then filtered it. Which student has made correct observations?
