Hydrochloric acid solutions $A$ and $B$ have concentrations of $0.5 \ N$ and $0.1 \ N$ respectively. The volumes of solutions $A$ and $B$ required to make $2 \ L$ of $0.2 \ N$ $HCl$ are:

All reactions which involve chemical disintegration are:

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$2AgF + MgCl_2 \longrightarrow MgF_2 \downarrow + 2AgCl \downarrow$

When metallic copper comes in contact with moisture,a green powdery/pasty coating can be seen over it. This is chemically known as

The incorrect postulates of the Dalton's atomic theory are :
$A$. Atoms of different elements differ in mass.
$B$. Matter consists of divisible atoms.
$C$. Compounds are formed when atoms of different element combine in a fixed ratio.
$D$. All the atoms of given element have different properties including mass.
$E$. Chemical reactions involve reorganisation of atoms.
Choose the correct answer from the options given below :

Which of the following aqueous solutions is neutral?