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प्रश्न
Give the formula of the following gas:
Nitric oxide
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उत्तर
Nitric oxide – NO
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संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Give two examples of the following:
Liquid + Liquid mixture:
Match the non-metallic elements – with their correct symbols. Non-metallic elements are:
| Non-Metallic elements | Symbol |
| (a) Carbon | (1) O |
| (b) Chlorine | (2) I |
| (c) Oxygen | (3) Si |
| (d) Phosphorus | (4) C |
| (e) Hydrogen | (5) Cl |
| (f) Nitrogen | (6) P |
| (g) Iodine | (7) F |
| (h) Bromine | (8) H |
| (i) Fluorine | (9) S |
| (j) Silicon | (10) Br |
| (k) Sulphur | (11) N |
Give the symbol and the number of atoms of the following elements present in sodium chloride.
Match the symbols of – radicals – with their correct combining power or capacity, (valency).
(a) OH
(b) So4
(c) No3
(d) Co3
Combining power or capacity – A : 3; B : 2; C : 1. (negative valencies)
State the type of element for the following:
Lead
Write the chemical formula of the following:
calcium sulphide
Give the formula of the following gas:
Hydrogen chloride
Symbol of mercury is
Write the symbols for the following elements.
- Oxygen
- Gold
- Calcium
- Cadmium
- Iron
