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प्रश्न
Choose the most appropriate answer
A pair of metalloids are
पर्याय
Na and Mg
B and Si
C and P
He and A
उत्तर
B and Si
APPEARS IN
संबंधित प्रश्न
Differentiate between:
pure and impure substances
Why is iron sulphide a compound ?
Tick the most appropriate answer.
The different constituents of ink are separated by
Fill in the blank
A ________ substance has only one kind of matter.
Write true or false
The constituents of a mixture can only be separated by chemical means
Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.
Chalk powder from water
Compare the properties of iron [II] sulphide with the iron-sulphur mixture, considering iron [II] sulphide as a compound & particles of iron & sulphur mixed together as an example of a mixture.
State any one method – to separate the following mixtures – Two solid mixtures one of which – dissolves in a – particular solvent and other does not
Give a reason for the following statement :
Centrifugation can be used for separating an insoluble heavier solid, present in an – insoluble solid-liquid mixture.
Match the mixtures in column I with their method of separation in column II.
| COLUMN I | COLUMN II | ||
| (a) | Oil mixed in water |
(i) | Sieving |
| (b) | Iron powder mixed with flour | (ii) | Hand picking |
| (c) | Salt mixed with water | (iii) | Decantation |
| (d) | Lady’s finger mixed with french beans | (iv) | Magnet |
| (e) | Rice flour mixed with kidney beans | (v) | Evaporation |
