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Match items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Cyanide process | (1) Ultrapure \[\ce{Ge}\] |
| (B) Froth Floatation Process | (2) Dressing of \[\ce{ZnS}\] |
| (C) Electrolytic reduction | (3) Extraction of \[\ce{Al}\] |
| (D) Zone refining | (4) Extraction of \[\ce{Au}\] |
| (5) Purification of \[\ce{Ni}\] |
Concept: undefined >> undefined
Match items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Sapphire | (1) \[\ce{Al2O3}\] |
| (B) Sphalerit | (2) \[\ce{NaCN}\] |
| (C) Depressan | (3) \[\ce{Co}\] |
| (D) Corundum | (4) \[\ce{ZnS}\] |
| (5) \[\ce{Fe2O3}\] |
Concept: undefined >> undefined
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Assertion: Sulphide ores are concentrated by Froth Flotation method.
Reason: Cresols stabilise the froth in Froth Flotation method.
Concept: undefined >> undefined
In a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present?
Concept: undefined >> undefined
Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?
Concept: undefined >> undefined
In the ring test of \[\ce{NO^{-}3}\] ion, \[\ce{Fe^{2+}}\] ion reduces nitrate ion to nitric oxide, which combines with \[\ce{Fe^{2+} (aq)}\] ion to form brown complex. Write the reactions involved in the formation of brown ring.
Concept: undefined >> undefined
\[\ce{P4O6}\] reacts with water according to equation \[\ce{P4O6 + 6H2O -> 4H3PO3}\]. Calculate the volume of 0.1 M NaOH solution required to neutralise the acid formed by dissolving 1.1 g of \[\ce{P4O6}\] in \[\ce{H2O}\].
Concept: undefined >> undefined
Nitric acid forms an oxide of nitrogen on reaction with P4O10. Write the reaction involved. Also write the resonating structures of the oxide of nitrogen formed.
Concept: undefined >> undefined
Give an example to show the effect of concentration of nitric acid on the formation of oxidation product.
Concept: undefined >> undefined
Indicate the complex ion which shows geometrical isomerism.
Concept: undefined >> undefined
\[\ce{IUPAC}\] name of \[\ce{[Pt(NH3)2 Cl(NO2)]}\] is ______.
Concept: undefined >> undefined
Assertion: Complexes of MX6 and MX5L type (X and L are unidentate) do not show geometrical isomerism.
Reason: Geometrical isomerism is not shown by complexes of coordination number 6.
Concept: undefined >> undefined
How can propan-2-one be converted into tert- butyl alcohol?
Concept: undefined >> undefined
Why is the reactivity of all the three classes of alcohols with conc. \[\ce{HCl}\] and \[\ce{ZnCl2}\] (Lucas reagent) different?
Concept: undefined >> undefined
Explain a process in which a biocatalyst is used in industrial preparation of a compound known to you.
Concept: undefined >> undefined
Amongst the following, the strongest base in aqueous medium is ______.
Concept: undefined >> undefined
Benzylamine may be alkylated as shown in the following equation:
\[\ce{C6H5CH2NH2 + R - X -> C6H5CH2NHR}\]
Which of the following alkylhalides is best suited for this reaction through SN1 mechanism?
Concept: undefined >> undefined
Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?
Concept: undefined >> undefined
In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one \[\ce{CH2}\] group in the carbon chain, the reagent used as source of nitrogen is ______.
Concept: undefined >> undefined
The source of nitrogen in Gabriel synthesis of amines is ______.
Concept: undefined >> undefined
