Principles Related to Practical Chemistry

Among $\mathrm{Fe^{3+}}$, $\mathrm{Pb^{2+}}$, $\mathrm{Cu^{2+}}$ and $\mathrm{Mn^{2+}}$, identify the one that gets precipitated out while passing $\mathrm{H_2S}$ in presence of $\mathrm{NH_4OH}$ as group reagent. The highest possible oxidation state of the corresponding metal is

Match the LIST-I with LIST-II. LIST-I (Compound): A. cyclohexanol; B. cyclohexylamine; C. cyclohexanecarbaldehyde; D. phenol. LIST-II (Test): I. Hinsberg's reagent test; II. Phthalein dye test; III. Lucas test; IV. Tollen's test. Choose the correct answer from the options given below:

Given below are two statements: Statement I: Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis. Statement II: Phenolphthalein is a weak base, therefore it dissociates in acidic medium. In the light of the above statements, choose the correct answer from the options given below

A paper dipped in a dil. $\mathrm{H_2SO_4}$ solution of 'X' upon treatment with $\mathrm{SO_2}$ gas turns into green. The compound 'X' is :

Identify A, B and C in the given below reaction sequence: $\boxed{A} \xrightarrow{\mathrm{HNO_3}} \mathrm{Pb(NO_3)_2} \xrightarrow{\mathrm{H_2SO_4}} \boxed{B} \xrightarrow{\text{(1) Ammonium acetate, (2) Acetic acid, (3) } \mathrm{K_2CrO_4}} \boxed{C}$ (yellow ppt)

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with $\mathrm{K_4[Fe(CN)_6]}$ is ____. $\mathrm{Cu^{2+},Fe^{3+},Ba^{2+},Ca^{2+},NH_4^+,Mg^{2+},Zn^{2+}}$

Find the compound 'A' from the following reaction sequences. $\mathrm{A} \xrightarrow{\text{aqua-regia}} \mathrm{B} \xrightarrow[\text{(2) AcOH}]{\text{(1) } \mathrm{KNO_2|NH_4OH}}$ yellow ppt

Given below are two statements: Statement I: In the oxalic acid vs $\mathrm{KMnO_4}$ (in the presence of dil $\mathrm{H_2SO_4}$) titration the solution needs to be heated initially to 60°C, but no heating is required in Ferrous ammonium sulphate (FAS) vs $\mathrm{KMnO_4}$ titration (in the presence of dil $\mathrm{H_2SO_4}$) Statement II: In oxalic acid vs $\mathrm{KMnO_4}$ titration, the initial formation of $\mathrm{MnSO_4}$ takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs $\mathrm{KMnO_4}$, heating oxidizes $\mathrm{Fe^{2+}}$ into $\mathrm{Fe^{3+}}$ by oxygen of air and error may be introduced in the experiment. In the light of the above statements, choose the correct answer from the options given below

Choose the correct tests with respective observations. (A) $\mathrm{CuSO_4}$ (acidified with acetic acid) + $\mathrm{K_4[Fe(CN)_6]} \rightarrow$ Chocolate brown precipitate. (B) $\mathrm{FeCl_3 + K_4[Fe(CN)_6]} \rightarrow$ Prussian blue precipitate. (C) $\mathrm{ZnCl_2 + K_4[Fe(CN)_6]}$, neutralised with $\mathrm{NH_4OH} \rightarrow$ White or bluish white precipitate. (D) $\mathrm{MgCl_2 + K_4[Fe(CN)_6]} \rightarrow$ Blue precipitate. (E) $\mathrm{BaCl_2 + K_4[Fe(CN)_6]}$, neutralised with NaOH $\rightarrow$ White precipitate. Choose the correct answer from the options given below :

Formation of $\mathrm{Na_4[Fe(CN)_5NOS]}$, a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of :