Oxidation states of the metal in the minerals haematite and magnetite, respectively are

For the first order reaction
2N₂O₅ (g) $$\to$$ 4NO₂ (g) + O₂ (g)

Consider the following cell reaction:
2Fe(s) + O₂(g) + 4H⁺(aq) $$\to$$ 2Fe²⁺ (aq) + 2H₂O (l); E^o = 1.67 V
At [Fe²⁺] = 10^-3 M, P(O₂) = 0.1 atm and pH = 3, the cell potential at 25^oC is

The freezing point (in ^oC) of a solution containing 0.1 g of K₃[Fe(CN)₆] (Mol. wt. 329) in 100 g of water (K_f = 1.86 K kg mol^-1) is

The number of hexagonal faces that are present in a truncated octahedron is ____________.

In 1 L saturated solution of AgCl [K_sp(AgCl) = 1.6 $$\times$$ 10^-10], 0.1 mol of CuCl [K_sp(CuCl) = 1.0 $$\times$$ 10^-6] is added. The resultant concentration of Ag⁺ in the solution is 1.6 $$\times$$ 10^-x. The value of "x" is

Match the transformations in column I with appropriate options in column II

Column I
(A) CO₂(s) $$\to$$ CO₂(g)
(B) CaCO₃(s) $$\to$$ CaO(s) + CO₂(g)
(C) 2H $$\to$$ H₂(g)
(D) P_{(white, solid)} $$\to$$ P_{(red, solid)}

Column II
(p) phase transition
(q) allotropic change
(r) $$\Delta H$$ is positive
(s) $$\Delta S$$ is positive
(t) $$\Delta S$$ is negative

Among the following complexes (K-P),

K₃[Fe(CN)₆] (K), [Co(NH₃)₆]Cl₃ (L), Na₃[Co(oxalate)₃] (M), [Ni(H₂O)₃]Cl₂ (N), K₂[Pt(CN)₄] (O) and [Zn(H₂O)₆(NO₃)₂] (P)

The diamagnetic complexes are

The major product of the following reaction is

Passing H₂S gas into a mixture of Mn²⁺, Ni²⁺, Cu²⁺ and Hg²⁺ ions in an acidified aqueous solution precipitates

Amongst the compounds given, the one that would from a brilliant coloured dye on treatment with NaNO₂ in dil. HCl followed by addition to an alkaline solution of $$\beta$$-naphthlol is

The following carbohydrate is

The equilibrium

$$2C{u^+} \to Cu^\circ + C{u^{2+}}$$

In aqueous medium at 25$$^\circ$$C shifts towards the left in the presence of

The correct functional group X and the reagent/reaction condition Y in the following scheme are

Reduction of the metal centre in aqueous permanganate ion involves

The total number of contributing structure showing hyper-conjugation (involving C-H bonds) for the following carbocation is _________.

Among the following, the number of compounds that can react with PCl₅ to given POCl₃ is _____________.

O₂, CO₂, SO₂, H₂O, H₂SO₄, P₄O₁₀

The volume (in mL) of 0.1 M AgNO₃ required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of $$[Cr{({H_2}O)_5}Cl]C{l_2}$$, as silver chloride is close to ____________.

The maximum number of isomers (including stereoisomers) that are possible on mono-chlorination of the following compound, is ____________.

Match the reactions in Column I with appropriate types of steps/reactive intermediate involved in these reactions as given in Column II :

	Column I		Column II
(A)		(P)	Nucleophilic substitution
(B)		(Q)	Electrophilic substitution
(C)		(R)	Dehydration
(D)		(S)	Nucleophilic
		(T)	Carbanion