Practical chemistry practice · Mixed difficulty

$100 \mathrm{~ml}$ of $0.1 \mathrm{~M}$ aqueous ferric alum solution is completely reduced with Iron to give Ferrous Ions. The volume of $0.1 \mathrm{~M}$ acidified $\mathrm{KMnO}_4$ solution required for complete reaction with ferrous Ions in the solution will be

A hydrated salt of $\mathrm{Na}_2 \mathrm{SO}_3$ loses $22.22 \%$ of its mass on strong heating. The hydrated salt is:

A metal salt solution gives a yellow ppt with silver nitrate. The ppt. dissolves in dil. nitric acid as well as in ammonium hydroxide. The solution contains

A salt gives violet vapours when treated with conc. $\mathrm{H}_2 \mathrm{SO}_4,$ it contains

A student is asked to determine the degree of
hydration of a salt by finding the mass of a
clean dried crucible and lid followed by the
mass of the crucible and lid containing a
sample of the salt. The crucible, lid and salt
are heated in a Bunsen burner flame, cooled,
and weighed. If the crucible, lid and salt are
heated only once instead of the recommended
three times, what will be the effect on the
degree of hydration compared with the actual
value?

Phosphorous can be estimated as

Which of the following can be used to precipitate lead salt.

Which of the following cations is detected by the flame test?

Moles of $\mathrm{KHC}_2 \mathrm{O}_4$ required to reduced 100 ml of 0.02 Molar $\mathrm{KMnO}_4$ in acidic medium to $\mathrm{Mn}^{+2}$ is

If $\mathrm{H}^{+}(a q)+\mathrm{OH}^{-}(a q) \rightarrow \mathrm{H}_2 \mathrm{O}({l}) ;$ $\Delta H=-X \mathrm{~kJ},$ then heat liberated for complete neutralisation of $1 \mathrm{~gm}$ molecule of $\mathrm{H}_2 \mathrm{SO}_4$ in aqueous solution wil be

In detection of $N$ and $S$ both in the compound by Lassaigne’s fusion test, blood red colour is due to formation of

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of $\mathrm{Fe}^{2+}$ ion?

The best indicator for the detection of the end point in the titration of a weak acid and a strong base is

The molar mass of an unknown organic liquid $(M \sim 100)$ is determined by placing $5 \mathrm{~mL}$ of the liquid in a weighed $125-\mathrm{mL}$ conical flask fitted with a piece of ${Al}$ foil with a pin hole in it. The flask is heated in a boiling water bath until the liquid evaporates to expel the air and fill the flask with the unknown vapor at atmospheric pressure. After cooling to room temperature the flask and its contents are reweighed. The uncertainty in which piece of apparatus causes the largest percentage error in the molar mass?

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with ${FeSO}_4$ in presence of concentrated ${H}_2 {SO}_4$ indicates the presence of element/s

$\mathrm{Fe}(\mathrm{OH})_3+\mathrm{HCl} \rightarrow \mathrm{A} \xrightarrow{\mathrm{K}_4\left[\mathrm{Fe} (\mathrm{CN})_6\right]} \mathrm{C};$ What is (C)?

When water is added to a salt solution containing chloroform, chloroform layer turns violet. Salt contains

$\mathrm{As}_2 \mathrm{S}_3$ is soluble in $\left(\mathrm{NH}_4\right)_2 \mathrm{S}_2$ forming:

When $\mathrm{MnO}_2$ and $\mathrm{H}_2 \mathrm{SO}_4$ is added to a salt $(\mathrm{A})$, the greenish yellow gas liberated as salt $(\mathrm{A})$ is:

${Fe}({OH})_3$ can be separated from ${Al}({OH})_3$ by addition of

Mercurous ion is represented as:

$100 \mathrm{~ml}$ of $1 \mathrm{~M} \mathrm{~KMnO}_4$ oxidized $100 \mathrm{~ml}$ of $\mathrm{H}_2 \mathrm{O}_2$ in acidic medium. Volume of same $\mathrm{KMnO}_4$ required to oxidise $100 \mathrm{~ml} \, \mathrm{H}_2 \mathrm{O}_2$ in basic medium will be

On passing a gas, '$X$', through Nessler's regent, a brown precipitate is obtained. The gas '$X$' is

Which of the following statements are correct?

A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.

B. Aniline can be purified by steam distillation as aniline is miscible in water.

C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.

D. An organic compound is pure, if mixed M.P. is remained same.

Choose the most appropriate answer from the options given below :

A mixture, on heating with conc. $\mathrm{H}_2 \mathrm{SO}_4$ and $\mathrm{MnO}_2$, librates brown vapour of

The pH range where the indicator shows change in colour are given as

(i) $4-9.7$ $\quad$ (ii) $7.46-10.0$ $\quad$ (iii) $6.5-4$

Which of the above pH range represents titration of

I. Strong acid/strong base $\left(S_A / S_B\right)$

II. Weak acid/strong base $\left(W_A / S_B\right)$

III. Weak base/strong acid $\left(W_B / S_A\right)$

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is:

$0.5 \mathrm{~g}$ mixture of oxalic acid $\left(\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4\right)$ and some sodium oxalate $\left(\mathrm{Na}_2 \mathrm{C}_2 \mathrm{O}_4\right)$ with some impurities requires $40 \mathrm{~ml}$ of $0.1 \mathrm{~M} \mathrm{~NaOH}$ for complete neutralization and $6 \mathrm{~ml}$ of $0.2 \mathrm{~M} \, \mathrm{KMnO}_4$ for complete oxidation. Calculate the $\%$ of $\mathrm{Na}_2 \mathrm{C}_2 \mathrm{O}_4$ in the mixture.

One mole of anhydrous $\mathrm{AB}$ dissolves in water and liberates $21.0 \mathrm{~J} \, {\mathrm{mol}^{-1}}$ of heat. The value of $\Delta H^{\ominus}\text{(hydration)}$ of $\mathrm{AB}$ is $-29.4 \mathrm{~J} \mathrm{~mol}^{-1}.$ The heat of dissolution of hydrated salt $\mathrm{AB}.2 \mathrm{H}_2 \mathrm{O}(\mathrm{s})$ is

$\text{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ is not used for the detection of