Which of the following statements is not true about an atom?

Match Column I with Column II and select the correct answer using the codes given below.

Codes:
A  B C  D

Consider the following reactions:

$Z{n}_{\left(s\right)} + CuS{O}_{4\left(aq\right)}\to$
$F{e}_{\left(s\right)}+ ZnS{O}_{4\left(aq\right)}\to$
$Z{n}_{\left(s\right)}+ FeS{O}_{4\left(aq\right)}\to$

Which of the above chemical reaction(s) will take place?

Consider the following reaction:

$CuO + H_2\stackrel{Heat}{\to } Cu + H_{2}O$   

Which species get oxidized in the given chemical reaction?

Consider the following statements:

1. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions.
2. Reactions in which energy is absorbed, are known as endothermic reactions.

Which of the statements given above is/are correct?

The iron blade of various tools such as a cart wheel has a ring in which the wooden handle is fixed. Normally, the ring is slightly smaller in size than a wooden handle. Which of the following principles is used to fix the ring?

Match Column I with Column II and choose the correct option.

Student (X) has taken five $100 mL$ beakers and labelled them A, B, C, D and E and also added $50 mL$ of water in each beaker. After that, she added the following composition of substance in each beaker. It is as follows:

Beaker A: Copper sulphate $\left(CuS{O}_4\right)$+ Zinc granule $\left(Zn\right)$
Beaker B: Copper sulphate $\left(CuS{O}_4\right)$+ Iron nail $\left(Fe\right)$
Beaker C: Zinc sulphate $\left(ZnS{0}_4\right)$+ Copper turnings $\left(Cu\right)$
Beaker D: Iron sulphate $\left(FeS{0}_4\right)$+ Copper turnings $\left(Cu\right)$
Beaker E: Zinc sulphate $\left(ZnS{0}_4\right)$+ Iron nail $\left(Fe\right)$.

Which of the following concepts is used to study the given reactions?