This option is correct because oxyacetylene is used in welding, cutting and cleansing of iron.

This option is correct.

This option is correct because Dacron belongs to terylene unit of the polymers.

This option is correct because complex pentamminenitrito chromium (III) chloride exhibits the linkage isomerism.

This option is correct.

This option is correct. In the electrolysis of the concentrated aqeuous solution of alkali salt of the saturated monocarboxylic acid using Pt electrode, alkane is collected at anode, while the strong base is collected at cathode.

This option is correct.

This option is correct because phthalimide is first of all treated with KOH to form potassium phathalimide, which is then heated with alkyl halides which gives N-alkyl phthalimide. Then, it is hydrolysed by the HCl to form phthalic acid, this is the Gabriel synthesis, while phenol reacts with diethyl sulphonate catalysed by strong base to form the anisole.

This option is correct because the stability of the complex ion is determined by the strength of ligand. Hence, CN ligand has strong ligand field. On the basis of its nature, this complex ion is the most stable. Cl and water  belongs to low ligand field.

This option is correct because formic acid and Fehling solution react to produce cuprous oxide, which gives reddish brown precipitate.

This option is correct because aldehydes are formed more easily to get reduced with acid chloride, but their reduction is checked by barium sulphate. The catalytic hydrogenation of acid chlorides allows the formation of aldehydes.

This option is correct because calcium carbonate when heated, decomposes into calcium oxide and carbon dioxide, which acts as basic as well as acidic oxide.

This option is correct.

This option is correct because acetanilide are formed by the aniline due to the addition of zinc, this reduces the coloured impurities of the aniline and also prevents the oxidation of the reaction.

This option is correct because para-toluidine contains the amino group. It undergoes the diasotisation reaction to give red dyes. Thus in benzyl amine, amino group is not directly attached with benzene. Hence, it does not undergoes diasotisation reaction.