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Question (21)

QN0035942

A strip of iron is placed in copper sulphate solution. What is expected?

(A) No reaction
(B) Copper is displaced by iron
(C) Iron is displaced by copper
(D) Hydrogen is released

Correct Answer: B

Explanation:

Iron is more reactive than copper, so it displaces copper from copper sulphate solution.

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Question (22)

QN0035943

A metal X displaces zinc from zinc sulphate solution but cannot displace magnesium from magnesium sulphate solution. Where would X lie in the reactivity series?

(A) Above magnesium and below zinc
(B) Below zinc and above copper
(C) Below copper
(D) Above potassium

Correct Answer: A

Explanation:

X must be more reactive than zinc but less reactive than magnesium.

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Question (23)

QN0035944

Metal A displaces metal B from its salt solution. What can be concluded?

(A) A is less reactive than B
(B) A is more reactive than B
(C) A and B have equal reactivity
(D) B is a non-metal

Correct Answer: B

Explanation:

A metal can displace another metal from its salt solution only when it is more reactive.

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Question (24)

QN0035945

Three metals P, Q and R have the following observations: P displaces Q, Q displaces R, and R cannot displace P. Which order of reactivity is consistent?

(A) P > Q > R
(B) R > Q > P
(C) Q > P > R
(D) P > R > Q

Correct Answer: A

Explanation:

If P displaces Q and Q displaces R, the order is P > Q > R.

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Question (25)

QN0035946

A metal X can displace zinc from zinc sulphate but cannot displace magnesium from magnesium sulphate. Which pair correctly gives the possible position of X?

(A) Between magnesium and zinc
(B) Between zinc and iron
(C) Below iron
(D) Above potassium

Correct Answer: A

Explanation:

X is more reactive than zinc but less reactive than magnesium, so it lies between them.

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Question (26)

QN0035947

Which of the following is the correct decreasing order of reactivity?

(A) K > Na > Ca > Mg
(B) Mg > Ca > Na > K
(C) Na > K > Mg > Ca
(D) Ca > K > Na > Mg

Correct Answer: A

Explanation:

Potassium is above sodium, which is above calcium and magnesium in the reactivity series.

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Question (27)

QN0035948

A metal has two electrons in its outermost shell and loses them to form a stable ion. What charge will the ion most likely have?

(A) 1−
(B) 2−
(C) 1+
(D) 2+

Correct Answer: D

Explanation:

Loss of two electrons produces a positively charged ion with a charge of 2+.

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Question (28)

QN0035949

An element has electronic configuration 2,8,1. What is the most likely charge of its ion?

(A) 1+
(B) 1−
(C) 2+
(D) 2−

Correct Answer: A

Explanation:

The element has one valence electron and tends to lose it, forming a 1+ ion.

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Question (29)

QN0035950

An element has electronic configuration 2,8,7. What change is most likely for it to attain a stable electronic configuration?

(A) Lose 7 electrons
(B) Gain 1 electron
(C) Lose 1 electron
(D) Gain 7 electrons

Correct Answer: B

Explanation:

An atom with seven valence electrons needs one more electron to complete its outer shell.

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Question (30)

QN0035951

Element X has configuration 2,8,1 and element Y has configuration 2,8,7. What is the likely formula of the compound formed between X and Y?

(A) XY
(B) X2Y
(C) XY2
(D) X2Y3

Correct Answer: A

Explanation:

X forms X+ by losing one electron and Y forms Y− by gaining one electron, so the formula is XY.

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Question (21)

A strip of iron is placed in copper sulphate solution. What is expected?

Explanation:

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Question (22)

A metal X displaces zinc from zinc sulphate solution but cannot displace magnesium from magnesium sulphate solution. Where would X lie in the reactivity series?

Explanation:

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Question (23)

Metal A displaces metal B from its salt solution. What can be concluded?

Explanation:

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Question (24)

Three metals P, Q and R have the following observations: P displaces Q, Q displaces R, and R cannot displace P. Which order of reactivity is consistent?

Explanation:

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Question (25)

A metal X can displace zinc from zinc sulphate but cannot displace magnesium from magnesium sulphate. Which pair correctly gives the possible position of X?

Explanation:

Link:

Question (26)

Which of the following is the correct decreasing order of reactivity?

Explanation:

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Question (27)

A metal has two electrons in its outermost shell and loses them to form a stable ion. What charge will the ion most likely have?

Explanation:

Link:

Question (28)

An element has electronic configuration 2,8,1. What is the most likely charge of its ion?

Explanation:

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Question (29)

An element has electronic configuration 2,8,7. What change is most likely for it to attain a stable electronic configuration?

Explanation:

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Question (30)

Element X has configuration 2,8,1 and element Y has configuration 2,8,7. What is the likely formula of the compound formed between X and Y?

Explanation:

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