Select the correct statement.
A The tiny grains that make up a rock are called minerals and there are always more than one mineral in a rock.
B Sandstone is the hardest rock while granite is the softest rock.
C Rocks break under the effect of sun, wind, water etc. and form humus that makes soil productive.
D Talc is the softest mineral while diamond is the hardest mineral.
Study the given Venn diagram carefully.
Which of the following colloidal systems correctly represent points 1, 2 and 3?
|A||Mist||Whipped cream||Dust fumes|
|B||Milk||Hair cream||Pumice stone|
|D||Coloured glasses||Wings of butterflies||Butter|
Ms Mehta, a science teacher gave different mixtures to four groups of students to separate their components. Which group was not following the correct method?
A Group 1 was separating a mixture of ethyl alcohol and water by using separating funnel.
B Group 2 was separating a mixture of ammonium chloride and sodium chloride using sublimation.
C Group 3 was separating a mixture of iron pins and sand by using a magnet.
D Group 4 was separating mud particles suspended in water using sedimentation and decantation.