ICSE Class 9 Chemistry Additional Charts 06 Select the correct answer

Chart - 6: Select The Correct Answer

1. Liquid-liquid homogeneous mixtures are separated by -. [evaporation/separating funnel/fractional distillation]

2. Decomposition of ammonium chloride by heat to give ammonia and chlorine is an example of -. [thermal decomposition/thermal dissociation/catalytic reaction]

3. The valency of copper in CuCl2 is -. [1+/2+/3+]

4. The law which relates between the pressure of a gas and the volume occupied by it, temperature remaining constant is -. [Charle's law/Boyle's law/Lussac's law]

5. The temperature - is called absolute zero. [273K/0°C/-273°C]

6. Oxygen in presence of U.V. light gives two -. This combines with - to give ozone. [oxygen atoms/oxygen molecule/two oxygen molecules]

7. Hydrogen and carbon monoxide are examples of - gases while chlorine and oxygen are examples of - gases. [non-combustible/combustible]

8. An increase in pressure on the surface of water causes - in the solubility of the gas dissolved in water. [increase/decrease/no change]

9. - is an example of an efflorescent salt, while - an example of a deliquescent salt. [lead chloride/washing soda/iron [III] chloride]

10. If an element 'X' has atomic number 18, then its valency is -. [+1/-1/0]

11. The maximum number of electrons in any shell of an atom is represented by 2n2. The maximum number of electrons in the M shell is -. [2/32/18/8]

12. Isotopes of chlorine have the same -, but different number of -. [atomic number/mass number/neutrons/protons/electrons]

13. An element 'Y' has atomic number 20. It finds position in period - [2/3/4] and group -. [1/2/3].

14. The basis of classification of elements by Newland was based on arrangement of elements in increasing order of -. [atomic number/atomic weights] in series of - [6/7/8].

15. The period-1 contains - elements, and periods 2 and 3 - elements each. There are - horizontal rows called periods, and - vertical columns called groups. An element in period-3 will have - electron shells or orbits and in group VA will have - valence electrons in its outermost shell. [2/3/5/7/8/10/18]

16. Period-2 is a - [short/long] period containing - [six/seven/eight] elements of which, carbon (at. no. 6) is placed in group - [14 [IVA]/15 [VA]/16 [VIA]], nitrogen (at.no.7) is placed in group - [14 /15/16], oxygen (at. no. 8) is placed in group - [14/15/16/17], sulphur (at. no. 16) is placed in group - [14/15/16/17] - chlorine (at. no. 17) is placed in group - [14/15/16/17].

17. On moving from left to right in a period, the number of electron shells - [remain same/increase by one], the number of valence electrons - [remain same/increase by one] and the elements show a transition from - [Non-metallic to metallic/metallic to non-metallic] character. On moving down a group, the valence electrons - [remain same/increase by one] and the elements show a transition from - [non-metallic to metallic/metallic to non-metallic] character.

18. A non-renewable source of energy fuel used instead of fossil fuel to reduce green house gas pollution is -. [hydrogen energy/biogas/C.N.G.]

19. From the elements of group 15 [VA] - - are non-metals and highly electronegative. The electronegativity - on moving down the group and so also the non-metallic character. [nitrogen/phosphorus/arsenic/antimony/increases/decreases]

20. Hydrogen gas is lighter than air and collected in the laboratory by -. [upward displacement of air/downward displacement of water/downward displacement of air]

21. Sulphur dioxide gas turns potassium permanganate solution from - to colourless and potassium dichromate from - to -. [orange/green/pink/blue]

22. Sodium chloride imparts a - colour on application of the flame test for identification of the metallic radical in the salt, calcium chloride a - colour and potassium chloride a - colour. [lilac/brick red/golden yellow]

23. - [hydrogen sulphide/nitrogen dioxide] turns lead acetate paper silvery black.

24. Heat on - [zinc nitrate/lead nitrate/copper nitrate] gives a black residue, a coloured - [acidic/basic/neutral] gas and a colourless - [acidic/basic/neutral] gas.

25. When a solid changes ino a liquid there is decrease in - and increase in -. [inter-particle attraction / inter-particle space].

26. The law of Conservation of Mass will not be strictly valid, unless - mass - energy are considered -. [separately / together].

27. All temperatures on the Kelvin scale are in - figures. [negative / positive].

28. -273°C is equal to -. [273 K / 0 K].

29. Colloidal solutions are - [homogeneous / heterogeneous] mixtures in which particles are not visible to the naked eye.

30. A heterogeneous immiscible liquid mixture can be separated by - [distillation / fractional distillation / separating funnel].

31. The valency of a metal is the number of electrons [gained / lost] per atom of the metal.

32. A chemical equation - [tells / does not tell] about the concentration of both reactants - products.

33. The formula of aluminium sulphide is -. [AlS / Al2S2 / Al2S3].

34. Loss or gain of energy is observed in a -. [physical / chemical] change.

35. Thermal -. [decomposition / dissociation] is a reversible reaction.

36. In the reaction: 2FeCl3 + H2S - 2FeCl2 + 2HCl + S the reduced product is -. [HCl / FeCl2 / S].

37. The metal which has a density more than water is -. [Na / Ca / K].

38. The metal which is above hydrogen in the activity series, but does not react with water is -. [Cu / Pb / Hg].

40. Ozone layer prevents harmful - from reaching the earth's surface. [U.V. rays / gamma rays / electromagnetic radiation].

41. If an element has 6 electrons in its outermost 'L' shell its valency is -. [+2 /-2 /+1 /-1].

42. - elements have atoms in which all shells are complete, except the outermost shell which is incomplete [bridge / normal / inner transition].

43. In Bosch process for the manufacture of hydrogen, the gas carbon dioxide is recovered by dissolving it in -. [cautic potash soln. / ammoniacal cuprous chloride / carbon disulphide].

44. In the manufacture of hydrogen, the reaction of water gas with excess steam in presence of a catalyst is an -. [exothermic / endothermic] reaction.

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