In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound?

Oxidation number of potassium in K2O. K2O2 and KO2 respectively is :

The redox reaction among the following is :

The compound that cannot act both as oxidising and reducing agent is :

While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?

On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H2 in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :

Reaction of an inorganic sulphite X with dilute H2SO4 generates compound Y. Reaction of Y with NaOH gives X. Further, the reaction of X with Y and water affords compound Z. Y and Z, respectively, are :

The reaction of NO with N2O4 at 250 K gives :

The correct statement with respect to dinitrogen is :

Reaction of ammonia with excess Cl2 gives :

Boron and silicon of very high purity can be obtained through :

On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is :

In a molecule of pyrophosphoric acid, the number of P - OH, P = O and P - O - P bonds/moiety(ies) respectively are :

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :

The reaction of H3N3B3Cl3 (A) with LiBH4 in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to H3N3B3(Me)3. Compounds (B) and (C) respectively, are :

'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is :

White Phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y). The basicity of compound (Y) is :

A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are :

The number of bonds between sulphur and oxygen atoms in S2O82- and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :

In the following reaction, products (A) and (B) respectively, are : NaOH + Cl2 $$\to$$ (A) + side products (hot and conc.) Ca(OH)2 + Cl2 $$\to$$ (B) + side products (dry)