Metals and non metals Worksheet-7

Metals and non metals Worksheet-7

Multiple-Choice Question (One Option Correct):

31. Arrange the following metals in the order of their decreasing chemical reactivities. Mg, Cu, Fe, Na, Zn, Pb, Ca

(A) Mg > Cu > Na > Zn > Fe > Pb > Ca

(B) Na > Zn > Fe > Pb > Cu > Mg > Ca

(C) Na > Mg > Ca > Zn > Fe > Cu

(D) Zn > Fe > Na > Mg > Ca > Cu > Pb

32. What type of oxides is formed by non-metals?

(A) Acidic             (B) Basic               (C) Neutral          (D) Both A and c

33. Non-metals do not react with water (or steam) to evolve hydrogen gas because-

(A) They are electronegative         

(B) They are electropositive

(C) Reaction of non-metals with water is an endothermic reaction

(D) They cannot give electrons to reduce Hydrogen ions of water

(E) A & D

(F) B & D

34. In the given reaction- 2NaCl + Br₂ → 2NaBr + Cl₂

(A) Chlorine is more reactive so it is released out as chlorine gas.

(B) Bromine is more reactive so it is displacing chlorine from its salt solution.

(C) Given reaction equation is wrong.

(D) Bromine is less reactive than chlorine and it cannot displace chlorine from its salt solution.

(E) Both C and D

(F) Both A and B

35. Sodium metal is more reactive than copper because–

(A) Sodium reacts with oxygen easily to form sodium oxide but copper does not react with oxygen easily.

(B) Sodium reacts with dilute acids evolving hydrogen gas where as copper does not.

(C) Reaction of sodium with water is vigorous.

(D) Copper is present below Hydrogen in the reactivity series.

(E) All of these

36. An element reacts with oxygen to give a compound with high melting point. This compound is also soluble in water. The element is likely to be-

(A) Calcium         (B) Carbon           (C) Silicon            (D) Iron

37. Atomic number of sulphur is 16. How many electrons are present in S^2–ion?

(A) 14                   (B) 18                   (C) 17                   (D) 19

38. How many electrons are present in N^3–ion?

(A) 9                     (B) 7                     (C) 8                     (D) 10

39. What type of ions will be formed by elements with atomic numbers x– 20, y – 15

(A) x – cation, y-cation

(B) x – anion , y-cation

(C) x – cation, y-anion

40. What type of bond will be formed between the elements with atomic numbers x – 13, y – 6

(A) Covalent bond

(B) Ionic bond

(C) Ionic in solution form and covalent in vapour phase.

(D) Covalent in solution form and ionic in vapour phase.

Answer key:

31. (C)

32. (D)

33. (E)

34. (E)

35. (E)

36. (A) 2Ca + O₂ → 2CaO Calcium oxide dissolves in water calcium hydroxide.

37. (B)

38. (D)

39. (C) X-Atomic number-20 E.fg-2,8,8,2 there are 2 electrons in the valence shell, so it forms cations. The element is calcium Y-Atomic number-15 E.fg-2,8,5 there are 5 electrons in the valence shell ,so it forms anion. The element is phosphorous

40. (A) A X-atomic number-13-E.Fg-2,8,3 the element is Aluminium Y-atomic number-6-E.fg- 2,4 the element is Oxygen