Chemistry
Select the correct answer from A, B, C, D and E for each statement given below-
A: Molecule B: Orbits C: Atom D: Valency E: Radical
The basic unit of matter not capable of independent existence.
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
An elementary particle of matter – of a group of atoms of different elements behaving as a single unit with charge on the group.
Imaginary path around the nucleus of an atom in which electrons revolve.
The term for the combining capacity of an element or the number of hydrogen atoms with which it combines or replaces.
Related Questions
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
Fill in the blanks with the correct words from the brackets.
A molecule of an element is …………… [water/chlorine/ammonia].
A radical with one atom of sulphur and three atoms of oxygen is …………… [bisulphite/sulphate/sulphite].
An element with variable valency is …………… [sodium/copper/calcium]
The formula of aluminum sulphate is …………… [AlSO4 / Al2(SO4)3 / Al3(SO4)2]
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group …………… [2/1]
Match the radicals in List I with their correct names from List II.
List I List II 1. NO31- A: Bisulphite 2. HSO41- B: Phosphate 3. SO42- C: Carbonate 4. PO43- D: Nitrite 5. HCO31- E: Bicarbonate F: Sulphate G: Nitrate H: Phosphite I: Sulphite J: Bisulphate State the correct formula of the following from the list given:
Calcium Hydroxide - Ca2OH/ Ca(OH)2 /CaOH
Sodium Bisulphite - NaHSO4/Na2HSO3/ NaHSO3
Ammonium Sulphate - (NH4)2SO4/NH4SO3/ (NH4)2SO3
Aluminium Phosphate - Al2(PO4)3 / AlPO4/ Al2(PO4)2
Copper [II] nitrate - Cu(NO3)2/Cu2NO3/CuNO3