Advertisements
Advertisements
प्रश्न
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
Advertisements
उत्तर
| Names | Acids | ||
| (1) | Carbonic acid | (d) | H2CO3 |
| (2) | Sulphuric acid | (c) | H2SO4 |
| (3) | Hydrochloric acid | (a) | HCI |
| (4) | Nitric acid | (b) | HNO3 |
संबंधित प्रश्न
Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The elements X and Y are most likely to be respectively :
An atom of an element is denoted by a “symbol”. Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Hydrogen by ‘H’
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Helium by ‘He’
Match the metallic elements – with their correct symbols Metallic elements
| Metallic elements | Symbol |
| (a) Potassium | (1) Ca |
| (b) Sodium | (2) Zn |
| (c) Calcium | (3) Pb |
| (d) Magnesium | (4) Hg |
| (e) Zinc | (5) Cu |
| (f) Aluminum | (6) Au |
| (g) Iron | (7) K |
| (h) Lead | (8) Fe |
| (i) Copper | (9) Al |
| (j) Mercury | (10) Na |
| (k) Silver | (11) Mg |
| (l) Platinum | (12) Pt |
| (m) Gold | (13) Ag |
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
K1+ Cl1-
Give three reasons why – carbon dioxide is considered a compound, while carbon – an element.
Give the symbol of the following element:
Sulphate
Give the formula of the following gas:
Sulphur dioxide
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Iodide
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Dichromate
