NTA JEE Mains 29th Jan 2025 Shift 2

In the sulphur estimation, 0.20 g of a pure organic compound gave 0.40 g of barium sulphate. The percentage of sulphur in the compound is ______ $$\times 10^{-1}%$$. (Molar mass : O = 16, S=32, Ba = 137 in $$gmol^{-1}$$)

Isomeric hydrocarbons $$\rightarrow$$ negative Baeyer's test (Molecular formula $$C_{9}H_{12}$$) The total number of isomers from above with four different non-aliphatic substitution sites is -

Consider the following low-spin complexes $$K_3[Co(NO_2)_6],\; K_4[Fe(CN)_6],\; K_3[Fe(CN)_6],\; Cu_2[Fe(CN)_6] and Zn_2[Fe(CN)_6]$$ The sum of the spin-only magnetic moment values of
complexes having yellow colour is. _____ B.M. (answer in nearest integer)

In the Claisen-Schmidt reaction to prepare, dibenzalacetone from 5.3 g of benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was ______ %.

Total number of non bonded electrons present in $$NO_{2}$$ -ion based on Lewis theory is