1. The unit in which atomic weight is expressed - a.m.u
2. The type of bond shared between sodium (23 11 Na] & sulphur [265] - electrovalent bond or ionic bond
3. A deliquescent substance also used in the softening of hard water - Calcium hydroxide, Ca(OH)₂
4. A liquid oxidizing agent and a gaseous reducing agent - Bleach is a liquid oxidising agent. Hydrogen is a gaseous reducing agent.
5. A salt or a gas which undergoes a photochemical reaction - Argentous Chloride ( AgCl ) and Argentous Bromide ( AgBr )
6. The salt formed when zinc reacts with caustic potash - Potassium zincate
7. The group number of the element having atomic number 12 - 2
8. The subatomic particle which carries a unit negative charge and has negligible mass - electron
9. A metal other than iron and copper which shows variable valency - mercury
10. Two neutral gases one of which is oxygen which combines to give a coloured acidic gas - Neutral gases Nitric oxide, NO combines with oxygen gas, O2 to form brown colour, acidic Nitrogen dioxide, NO2 gas.
11. The acid responsible for slight acidity in natural rain water - carbonic acid
12. A gas which is combustible but a non-supporter of combustion - hydrogen
13. A metal exhibiting valency 2 and 37 - Copper
14. The gas liberated when ammonium dichromate undergoes thermal decomposition - nitrogen
15. A gas responsible for melting of ice-caps - Carbon dioxide
16. A salt whose solubility decreases with increase in temperature of water - copper sulphate.
17. A compound which on thermal decomposition, leaves a metallic residue and a gas which relits a glowing splint - copper carbonate
18. The residue left on dehydration of glucose by concentrated sulphuric acid - Along with heat carbon dioxide is is liberated which is released with steam and sulphur oxide fumes
19. A hygroscopic liquid which acts as a drying and a dehydrating agent - Sulphuric acid
20. The covalent compound which has, two shared pairs of electrons between each of the two atoms - oxygen
21. The chemical other than chlorofluorocarbon, responsible for ozone depletion & global warming - liquefied ammonia gas, aerosol spray
22. An exothermic reaction involving two neutral gaseous reactants - N^2 + H^2 giving 2NH^3
23. An element which does not lose, gain or share electrons and has two electrons in its valence shell - Inert gas - Helium
24. A non-metal in group 17 VII[A] of the periodic table, which is a solid at ordinary temperatures - Iodine
25. The salt formed when aluminium reacts with conc. sodium hydroxide solution - sodium aluminate (NaAlO2)
26. The process involving hydrogen used in the manufacture of vegetable fat - Hydrogenation
27. The type of oxide formed by the element in period 3 and group 13 [IIIA] - Aluminium oxide
28. The valency of calcium in calcium nitride - Ca3N2
29. An element other than hydrogen and chlorine which exists in the isotopic form - Uranium
30. A lead salt which evolves reddish brown fumes on thermal decomposition - Lead nitrate
31. The more electronegative element from the elements oxygen and sulphur present in group 16 [VIA) - Sulphur
32. The law which states that the product of the volume and pressure of a given mass of a dry ga
s is constant provided temperature remains constant - Boyle's law
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