The standard enthalpy of formation of NH3 is −46.0 kJ mol−1. If the enthalpy of formation of H2 from its atoms is −436kJ mol−1 and that of N2 is −712kJ mol−1, the average bond enthalpy of N−H bond in NH3 is
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The height at which the acceleration due to gravity becomes 9g (where g = the accleeration due to gravity on the surface of the earth) in terms of R, the radius of the earth is
α−D−(+)-glucose and β−D−(+)−glucose are
Toluene is nitrated and the resulting product is reduct is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then with cuprous bromide. The reaction mixture so formed contains
The organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction, is
Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being
The hydrocarbon which can react with sodium in liquid ammonia is
A capillary tube (A) is drooped in water. Another identical tube (B) is dipped in a soap water solution which of the following shows the relative nature of the liquid columns in the two tubes ?
If u^and v^are unit vectors and θis the acute angle between them, then 2u^×3v^is a unit vector for