chemical reactions

In the reaction of hydrogen with black copper oxide.

copper oxide.

a oxidation process takes place

c. oxidation and reduction

b. reduction

d. no correct answer

• a

• b

• c

• d

Double substitution reactions are classified into:

a. reaction between acid and alkali.

b. reaction between acid and salt.

c. reaction between salt and another salt.

d. all the previous answers.

• A

• B

• C

• D

The oxidizing factor is the substance which

a. gives oxygen only.

b. takes hydrogen only.

c. gains electron(s) only.

d. (a). (b) and (c).

• A

• B

• C

• D

During the reaction of sodium with chlorine, chlorine atom is reduced as it

------------ an electron and changes into negative ION

On adding silver nitrate solution to sodium chloride solution, a ------------- is formed.

When hydrogen gas passes over hot copper oxide, hydrogen is combines with -----------

The substance which takes oxygen away or gives hydrogen during a chemical reaction.

A chemical process where the atom loses an electron or more.----------

What is the scientific idea on which the air bags in cars are designed

H₂+ CuO------> Cu + H₂O

Determine the oxidizing agent and the reducing agent and mention why?