Which separation techniques will you apply for the separation of the following?
(a) Sodium chloride from its solution in water
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride
(c) Small pieces of metal in the engine oil of a car
(d) Different pigments from an extract of flower petals
(e) Butter from curd
(f) Oil from water
(g) Tea leaves from tea
(h) Iron pins from sand
(i) Wheat grains from husk
(j) Fine mud particles suspended in water
The following separations techniques are used to separate are -
(a) Sodium chloride from its solution in water : Evaporation
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride : Sublimation
(c) Small pieces of metal in the engine oil of a car : Filtration
(d) Different pigments from an extract of flower petals : Chromatography.
(e) Butter from curd : centrifugal machine or churning the curd by hand.
(f) Oil from water : Decantation
(g) Tea leaves from tea : Filtration.
(h) Iron pins from sand : Magnetic Separation.
(i) Wheat grains from husk : Winnowing.
(j) Fine mud particles suspended in water : Coagulation and decantation.
A driver of a car travelling at \(52\) \(km \;h^{–1}\) applies the brakes Shade the area on the graph that represents the distance travelled by the car during the period.
Which part of the graph represents uniform motion of the car?
| A | B |
|---|---|
| (i) broke out | (a) an attitude of kindness, a readiness to give freely |
| (ii) in accordance with | (b) was not able to tolerate |
| (iii) a helping hand | (c) began suddenly in a violent way |
| (iv) could not stomach | (d) assistance |
| (v) generosity of spirit | (e) persons with power to make decisions |
| (vi) figures of authority | (f) according to a particular rule, principle, or system |
ABC is a triangle in which altitudes BE and CF to sides AC and AB are equal (see Fig). Show that
(i) ∆ ABE ≅ ∆ ACF
(ii) AB = AC, i.e., ABC is an isosceles triangle.
