CIE Chemistry Paper-1: Specimen Questions 78 - 80 of 99
Question number: 78
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.
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.
Question number: 79
What is a redox reaction?
Gain of electrons by a molecule, atom or ion.
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|
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
What will be the pH of 0.10 M of HCl solution?
as we know that therefore, So, pH = 1. Hence, pH of. 10 M HCL solution is 1.