Some Basic Concepts Of Chemistry

Mass of HCl in 500 cc of 0.5 N HCI


The balanced equation for the reaction is
\underset{\text{100 g}}{ {Ca}}C0_3 \underset{\text{2 36.5 g}}{{2HCl}}
of HCI react with 100 g of
9.125 g of HCI will react with
to

For neutralization, no. of gram equivalents of the acid should be equal to no. of gram equivalents of the base.
No. of gram equivalents of NaOH

Now,
Emass of acid =

The balanced equation for the reaction is:
+
100 g of reacts completely with 73 g of HCl
So, 5 g of will react with
of HCl
= 3.65 g of HCI

For neutralization, no. of gram equivalents of acid should be equal to no. of gram equivalents of base. No. of gram equivalents of NaOH Now,

Answer (b) 298 K

No. of gram equivalents of NaOH
=
For neutralization,
No. of gram equivalents of NaOH should be equal to no. of gram equivalents of the acid.
Hence,
E wt. of acid

0.08 N of Mohr's salt= 0.08 M
No. of moles in 25 mL of 0.08 M Mohr's salt solution

No. of moles in 500 cc of Mohr's salt solution

Hence, mass of Mohr's salt present in 500 cc

Oxalic acid ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? NaOH
? ?

According to this law, the product of atomic mass and specific heat of a solid element is approximately equal to . This law is valid for solid elements only.

Mohr's salt is ' .

Equivalent wt. of Mohr's salt =

Thus, 12 g of Mg produces= 1 g
or 11.2

of oxygen at S.T.P.
= atoms
of oxygen at S.T.P.
=
= atoms

106 g
1.06 g
=

No. of moles of
= 0.01 mol
[ Molar mass of ]
100 mL of N/5 HCl =
= 0.02 mol
The reaction is represented as :

1 mole of reacts with 2 moles of HCI. Hence, 0.01 mole of will react completely with 0.02 mole of HCI.

Step 1: Analyze boiling point factors.
Boiling point depends on intermolecular forces like hydrogen bonding, van der Waals forces, etc. Step 2: Compare methoxymethane and ethanol.
Methoxymethane (CH –O–CH ) is an ether and shows dipole-dipole interactions but no hydrogen bonding.
Ethanol (CH CH OH) has strong hydrogen bonding due to the –OH group. Step 3: Result.
Hydrogen bonding increases boiling point. Hence, ethanol has a higher boiling point than methoxymethane. So, statement A is false.

- : This compound exists as cyanogen ( ), a well-known compound.
- : This compound does not exist. There is no stable compound formed between nitrogen and five carbon atoms in the form of .
- : This is a well-known compound, antimony trichloride.
- : This is a known compound, nitrogen triiodide, which is highly explosive.
Thus, the correct answer is (B), as does not exist.