Advertisements
Advertisements
प्रश्न
Give the formula of the following gas:
Nitrogen dioxide
Advertisements
उत्तर
Nitrogen dioxide – NO2
APPEARS IN
संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
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 :
How are the elements with variable valency named? Explain with an example.
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 |
Give the symbol of the following element:
Bromine [bromide]
State the type of element for the following:
Fluorine
State the type of element for the following:
Copper
Write the chemical formula of the following:
calcium sulphide
Give a reason – Magnesium [2, 8, 2] has valency 2+.
What is the expansion of IUPAC.
