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प्रश्न
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
उत्तर
A radical is an atom or group of an atom of the same or different elements that behave in the manner of positive or negative ions.
(a) NO3 – nitrate
(b) OH – hydroxide
(c) SO4 – sulphate
(d) CO3 – carbonate
संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
Give one example for the following types of mixtures :
solid-liquid heterogenous mixture.
Give one example for the following types of mixtures:
liquid-gas homogenous mixture
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
Name: a Liquid Non-metal
Select the correct answer from the choice given below.
An impure substance
Select the correct answer from A, B, C, D & E for the statement given below :
A non-metal that is lustrous.
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 |
Classify the following as metals, non-metals and metalloids.
Sodium, Bismuth, Silver, Nitrogen, Silicon, Carbon, Chlorine, Iron, Copper
Higher-Order Thinking questions:
Why is hydrogen considered an element?
