Class 12th

Amongst the following statements regarding adsorption, those that are valid are:
(a) ΔH becomes less negative as adsorption proceeds.
(b) On a given adsorbent, ammonia is adsorbed more than nitrogen gas.
(c) On adsorption, the residual force acting along the surface of the adsorbent increases.
(d) With increase in temperature, the equilibrium concentration of adsorbate increases.

Arrange the following labelled hydrogens in decreasing order of acidity:

Let a, b, c ∈ R be all non-zero and satisfy a³ + b³ + c³ = 2. If the matrix A = [a, b, c; b, c, a; c, a, b] satisfies A?A = I, then a value of abc can be

The major product of the following reaction is:

The results given in the below table were obtained during kinetic studies of the following reaction: 2A + B → C + D
2A + B → C + D

X and Y in the given table are respectively:

Cast iron is used for the manufacture of:

The major product obtained from E?-elimination of 3-bromo-2-fluoropentane is

Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of Mⁿ⁺ ion are provided below; their λ_max values are marked as A, B and C respectively. The correct match between the complexes and their λ_max values is:

(i) [M(NCS)₆]⁽⁻⁶⁺ⁿ⁾
(ii) [MF₆]⁽⁻⁶⁺ⁿ⁾
(iii) [M(NH₃)₆]ⁿ⁺

The correct observation in the following reaction is:

Two compounds A and B with same molecular formula (C?H?O) undergo Grignard reaction with methylmagnesium bromide to give products C and D. Products C and D show following chemical tests. C and D respectively are: