Advertisements
Advertisements
प्रश्न
Write the chemical formula of the following:
calcium sulphide
Advertisements
उत्तर
CaS
APPEARS IN
संबंधित प्रश्न
The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
Match the formulas of the following gases with their correct names :
Gases - (a) H2 (b) N2 (c) O2 (d) Cl2 (e) HCI (f) NH3 (g) CO (h) CO2 (i) SO2 (j) NO (k) NO2.
Names:
(1) Ammonia (2) Nitrogen Dioxide (3) Oxygen (4) Hydrogen (5) Nitrogen (6) Chlorine (7) Carbon Monoxide (8) Sulphur Dioxide (9) Nitrogen Monoxide (10) Carbon Dioxide (11) Hydrogen Chloride
Select the correct answer from the choice given below.
The type of element-phosphorus
Give the symbol of the following element:
Phosphorus
State the type of element for the following:
Lead
Write the radical of the following valency:
Hydroxide
Give the formula of the following gas:
Hydrogen chloride
Give a reason – Magnesium [2, 8, 2] has valency 2+.
Define Alchemy.
How many elements are known at present?
