Q I. Name or state the following:
1. The unit in which atomic weight is expressed
2. The type of bond shared between sodium (23 11 Na] & sulphur [265] during the formation
of the compound sodium sulphide.
3. A deliquescent substance also used in the softening of hard water.
4. A liquid oxidizing 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 acidic 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 2and 37.
14. The gas liberated when ammonium dichromate undergoes thermal decomposition.
15. A gas responsible for melting of ice-caps.
16. A salt whose solubility decreases with increase in temperature of water.
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 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.
21. The chemical other than chlorofluorocarbon, responsible for ozone depletion & global warming.
22. An exothermic reaction involving two neutral gaseous reactants.
23. An element which does not lose, gain or share electrons and has two electrons in its valence
shell.
24. A non-metal in group 17 VIIA] of the periodic table, which is a solid at ordinary temperatures.
25. The salt formed when aluminium reacts with conc. sodium hydroxide solution.
26. The process involving hydrogen used in the manufacture of vegetable fat.
27. The type of oxide formed by the element in period 3 and group 13 [IIIA].
28. The valency of calcium in calcium nitride.
29. An element other than hydrogen and chlorine which exists in the isotopic form.
30. A lead salt which evolves reddish brown fumes on thermal decomposition.
31. The more electronegative element from the elements oxygen and sulphur present in
group 16 [VIA).
32. The law which states that the product of the volume and pressure of a given mass of a dry ga
is constant provided temperature remains constant.
Answers
Answer:
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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Explanation:
इट इज वेरी लोंग क्वेश्चन फॉर यू आर वन बाय वन