CIE Chemistry Paper-1: Specimen Questions 78 - 80 of 99

Question number: 78

MCQ▾

Question

A metal X exhibits following properties. Which possible metal can be X

  • It is found in free state in nature.
  • It is a very less reactive metal.
  • It does not corrode easily.

Choices

Choice (4) Response
a.

Magnesium

b.

Gold

c.

Aluminium

d.

Iron

Answer

b.

Explanation

Noble Metals are found as pure metals because they are unreactive and don’t combine with other elements to form compounds. Because they are so unreactive, they don’t corrode easily. This makes them ideal for jewellery and coins. Noble metals include copper, palladium, silver, platinum, and gold.

 Metals from top to down

Metals from top to down

Metals in order of reactivity

Question number: 79

MCQ▾

Question

What is a redox reaction?

Choices

Choice (4) Response
a.

Gain of electrons by a molecule, atom or ion.

b.

Loss of electrons by a molecule, atom or ion.

c. Both a. and b. are correct
d. Question does not provide sufficient data or is vague

Answer

c.

Explanation

The reactions in which oxidation and reduction takes place simultaneously are known as redox reactions. Loss of electrons by a molecule, atom or ion is oxidation whereas) Gain of electrons by a molecule, atom or ion is known as reduction.

Question number: 80

MCQ▾

Question

What will be the pH of 0.10 M of HCl solution?

Choices

Choice (4) Response
a.

4

b.

1

c.

2

d.

3

Answer

b.

Explanation

[H+]=[HCl]=0.10mol/l

as we know that pH=log(conc.ofH+ions) therefore, pH=log(.10) pH=log(1/10)pH=(01) pH=(1) So, pH = 1. Hence, pH of. 10 M HCL solution is 1.

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