Class 12th

If [x] be the greatest integer less than or equal to x, then ∑₁₀₀ₙ₌₈ [(-1)ⁿ n]/2 is equal to:

An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with AgNO₃ [Carius Method], the percentage of chlorine in compound A is _______ when it forms 0.3849 g of AgCl (Round off to the Nearest integer) (Atomic masses of Ag and Cl are 107.87 and 35.5 respectively)

In gaseous triethyl amine the "-C-N-C-" bond angle is _______ degree.

The number of geometrical isomers possible in triamminetrinitrocobalt(III) is X and in trioxalatochromate(III) is Y. Then the value of X + Y is _______.

The conductivity of a weak acid HA of concentration 0.001 mol L⁻¹ is 2.0 * 10⁻⁵ S cm⁻¹. If Λ⁰ₘ(HA) = 190S cm²mol⁻¹, the ionization constant (Kₐ) of HA is equal to _______ * 10⁻⁶ (Round off to the nearest integer)

Given below are two statements:
Statement I: Aniline is less basic than acetamide.
Statement II: In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option:

The statement that is INCORRECT about Ellingham diagram is:

0.8 g of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then __________ ml. of 1 M H₂SO₄ would have been neutralized by the ammonia evolved during the analysis.

The product obtained from the electrolytic oxidation of acidified sulphate solutions, is:

Which one of the following compounds will liberate CO?, when treated with NaHCO?