1) The unit in which atomic weight is expressed.
2) The type of bond shared between sodium [²³₁₁Na] & Sulphur [³²₁₆S] during the formation of the compound sodium sulphide.
3) A deliquescent substance also used in the softening of hard water.
4) A liquid oxidising agent and a gaseous reducing agent.
5) A salt or a gas which undergoes a photochemical reaction.
6) The salt formed when zinc reacts with caustic potash.
7) The group number of the element having atomic number 12.
8) The subatomic particle which carries a unit negative charge and has negligible mass.
9) A metal other than iron and copper which shows variable valency.
10) Two neutral gases one of which is oxygen which combines to give a coloured acidics gas.
11) The acid responsible for slight acidity in natural rain water.
12) A gas which is combustible but a non-supporter of combustion.
13) A metal exhibiting valency 2⁺ and 3⁺
14) The gas liberated when ammonium dichromate undergoes thermal decomposition.
15) A gas liberated when ammonium dichromate undergoes thermal decomposition.
16) A gas responsible for melting of ice-caps.
17) A compound which on thermal decomposition, leaves a metallic residue and a gas which relits a glowing splint.
18) The residue left on dehydration of glucose by concentrated of sulphuric acid.
19) A hygroscopic liquid which acts as a drying and a dehydrating agent.
20) The covalent compound which has, two shared pairs of electrons between each of the two atoms.
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