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प्रश्न
Give two applications of chromatography.
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उत्तर
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संबंधित प्रश्न
Classify the following substances into compounds and mixtures:
Fill in the blank
Use of a ................. to separate the components of a mixture of solids is based on the difference in the size of the components
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Name: Three different forms of carbon
Tick (√) the correct alternative from the choice given for the following statement
A non-metal which is a good conductor of electricity.
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Write the names of elements from the following symbol:
Si
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
The first letter of an element is always written in ______ letter.
Water contains _____ and _____ element.
