Answers of MCQ of Metals and Non Metals:-

 Metals and Non Metals

 mcq

MCQ Answers:-

 1. Physical nature of most of the ionic compounds is

• May exist in any statewrong
• liquid
• solidcorrect
• gas

2. Which of the following is/are oxide ore(s)?

• Bauxite
• Cuprite
• Hematite
• All of thesecorrect

3. Horn silver is a/an

• halide orecorrect
• sulphide ore
• sulphate ore
• oxide ore

4. Greenish coating that develops on copper utensils is due to formation of

• $CuC{O}_3$correct
• $Cu(OH{)}_2$
• $CuO$
• $Cu(OH{)}_2\cdot CuC{O}_3$

5. Which of the following is used in reduction of alumina?

• Electricitycorrect
• Coke
• Aluminum
• Carbon monoxide

6. Which of the following conditions are necessary for rusting of iron?

• Presence of water only
• Presence of air only
• Presence of water and air bothcorrect
• None of these

7. Food cans are coated with tin and not with zinc because

• zinc is more reactive than tincorrect
• zinc has higher melting point than tin
• zinc is costlier than tin
• zinc is less reactive than tin

8. Carnallite is

• $KCl,MgC{l}_2,H_{2}O$
• $KCl,MgC{l}_2,6H_{2}O$correct
• $KCl,MgC{l}_2$
• $KCl,MgC{l}_2,3H_{2}O$

9. Which method is used in purification of mercury?

• Liquation
• Distillationcorrect
• Electrolytic refining
• Chemical reduction

10. Reactivity of zinc is .............. than hydrogen

• equal
• sometimes more sometimes less
• less
• morecorrect

11. Which of the following methods is based on the principle of the difference in the wetting properties of the ore and gangue particles with water and oil

• Front floatation processcorrect
• Hydraulic washing
• None of these
• Magnetic separation

12. Process of roasting and calcination takes place in

• blast furnace
• Bessemer converter
• electrolytic cell
• reverberatory furnacecorrect

13. During formation of iconic bond

• There is force of repulsion between two negative ions
• There is force of repulsion between two positive ions
• none of these
• There is force of attraction between positive and negative ionscorrect

14. Anode mud is obtained in which process?

• Zone refining
• Electrolytic refiningcorrect
• Roasting
• Calcination

15. For purification of which metal, liquation method is used?

• Bismuth
• Tin
• All of thesecorrect
• Lead

16. In thermite process reducing agent is

• $C$
• $Cl$
• None of these
• $Al$correct

17. Which reducing agent is used in chemical reduction?

• $C$
• $CO$
• $Al$
• All of thesecorrect

18. Which of the following properties is not a characteristic of metals?

• High density
• Hardness
• Low melting and boiling pointcorrect
• Metallic lusture

19. Ionic compounds are soluble in

• benzene
• alcohol
• Watercorrect
• ether

20. Forth floatation method is used for the concentration of

• suphate ores
• oxide ores
• halide ores
• sulphide orescorrect

21. Which of the following is not and alloy of aluminum?

• Duralumin
• Magnalium
• Alnico
• All are alloys of aluminumcorrect

22. Ionic compound have

• High melting and low boiling points
• Low melting and low boiling points
• High melting and high boiling pointscorrect
• Low melting and high boiling points

23. Match column A with column B and select the correct option

Column A (Ore)	Column B (Nature of ore)
(a) Copper glance	(i) sulphate ore
(b) Calamine	(ii) Halide ore
(c) Rock salt	(iii) Sulphide ore
(d) Epsom salt	(iv) Carbonate ore

• a (iv), b (ii), c (iii), d (i)
• a(iv), b(i), c(ii), d(iii)
• a (iii), b (iv), c (ii), d (i)correct
• (A) a(i), b (ii), c (iii), d (iv)

24. When a metal is added to dilute HCl solution, there is no evolution of gas. Metal is

• $K$
• $Na$
• $Zn$
• $Ag$

25. Octet rule was given by

• Soddy
• Lewis and Kosselcorrect
• None of these
• Rutherford

26. On addition of which metal, copper sulphate solution (Blue color) will be changed to colorless solution

• $Fe$
• $Ag$
• $Zn$correct
• $Hg$

27. Which of the following metals reacts vigorously with oxygen?

• Magnesiumcorrect
• copper
• Zinc
• Magnesium

28. Heating of concentrated ore in absence of air for conversion in oxide ore in known as

• reduction
• none of these
• roasting
• Calcinationcorrect

29. Which of the following methods is used in the concentration of haematite ore?

• Magnetic separationcorrect
• none of these
• Froth floatation process
• Hydraulic washing

30. Which of the following methods is suitable for preventing an iron vessel from rusting?

• Applying grease
• Applying paint
• Applying a coating of zinc
• All the abovecorrect

31. Chemical rust is

• only ferric oxide
• None of these
• hydrated ferric oxidecorrect
• hydrated ferrous oxide

32. Pure gold is equal to

• 22 carat
• 24 caratcorrect
• 100 carat
• 1000 carat

33. What is the decreasing order of reactivity of following metals?

$Na,Al,/,Cu,Ag,Fe$

• $K>Na>AI>Cu>Fe>Ag$
• $K>Na>AI>Fe>Cu>Ag$correct
• $Na>K>AI>Cu>Ag>Fe$
• $K>Na>AI>Fe>Ag>Cu$

34. An alloy which does not contain copper is

• magnaliumcorrect
• brass
• german silver
• bronze

35. Silver metal becomes black on exposure to air by the coating of

• Silver sulphidecorrect
• Silver oxide
• Silver hydroxide
• Silver chloride

36. Which of the following metals generally occur in liquid sate?

• Bromine
• Mercury and Gallium bothcorrect
• Gallium
• Mercury

37. Removal of impurities from ore is known as

• Minerals
• concentration of orecorrect
• gangue
• Crushing and grinding

38. Which of the following is most abundant metal on the earth’s crust?

• Aluminumcorrect
• Oxygen
• Iron
• Calcium

39. When sodium reacts with cold water, then the product formed will be

• $N{a}_{2}O$
• All of these
• $N{a}_{2}C{O}_3$
• $NaOH$

40. $Zn+xHCl\to ZnC{l}_2+Z$

In above equation $A$ and $x$ are

• $H_2,2$correct
• $H_2,3$
• $H_2,4$
• $C{l}_2,1$

41. Exception of octet rule is

• $K$
• $He$correct
• $N$
• $Ca$

42. Which of the following methods is used for obtaining metals of very high purity?

• Distillation
• Electrolytic refining
• Zone refiningcorrect
• Liquation

43. German silver is an alloy of

• Cu,Zn and Nicorrect
• Cu and Ni
• Cu, Sn and Ag
• Cu,Ni Fe and Mn

44. Iconic compounds conduct electricity in

• fused statecorrect
• Gaseous state
• Do not conduct electricity at all
• Solid state

45. Ionic bond is formed by

• sharing of electrons
• Gain of electrons only
• Loss of electrons only
• Loss and gain of electrons bothcorrect

46. Alloys are a homogeneous mixture of

• metals or metals and non-metalscorrect
• metals only
• None of these
• non-metals only

47. Which of the following methods is not used in purification of metals?

• Liquation
• None of these
• Calcinationcorrect
• Distillation

48. $Zn+H_{2}O\left(steam\right)\to A+B$

In the above equation $A$ and $B$ are

• $Zn{H}_2\text{and}{O}_2$
• $Zn{O}_2\text{and}{O}_2$
• $Zn\text{and}{H}_3$
• $ZnO\text{and}{H}_2$correct

49. Ionic bond is formed between

• None of these
• Electropositive and electronegative elementscorrect
• Two electro-negative elements
• Two electro-positive elements

50. In the formation of ionic bond, cation is formed by

• gain of electron(s).
• loss of electrons (s).correct
• None of these
• Sharing of electrons (s)

Answers in bold blue colored