Name the method that can be used for separating the following mixtures.
(i) Sand and husk
(ii) Butter from curd
(iii) Water and petrol
(iv) Poison from blood
(i) Sand and husk can be separated by the method of winnowing.
(ii) Butter from curd can be separated by the method of centrifugation.
(iii) Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.
(iv) Poison from blood can be separated by the use of chromatography.