Chemistry

The correct order of energy of absorption for the following metal complexes is

A : ${\left[Ni{\left(en\right)}_3\right]}^{2+}$ , B : ${\left[Ni{\left(N{H}_3\right)}_6\right]}^{2+}$ , C : ${\left[Ni{\left(H_{2}O\right)}_6\right]}^{2+}$

The total number of acidic oxides from the following list is NO, N₂O, B₂O₃, N₂O₅, CO, SO₃, P₄O₁₀

The correct order of density is

High purity (> 99.95%) dihydrogen is obtained by

Given below are two statements.

Statement I: Pig iron is obtained by heating cast iron with scrap iron.

Statement II: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer form the options given below.

The first ionization entahalpies of Be, B, N and O follow the order

For micelle formation, which of the following statements are correct?

A. Micelle formation is an exothermic process.

B. Micelle formation is an endothermic process.

C. The entropy change is positive.

D. The entropy change is negative.

The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is

$K_{a_1},K_{a_2}and{K}_{a_3}$ are the respective ionization constants for the following reaction (a), (b) and (c).

(A) $H_2{C}_2{O}_4?H^{+}+H{C}_2{O}_4^{-}$

(B) $H{C}_2{O}_4^{+}?H^{-}+C_2{O}_4^{2-}$

(C) $H_2{C}_2{O}_4?2H^{+}+C_2{d}_4^{2-}$

Two solutions A and B are prepared by dissolving 1g of no-volatile solutes X and Y respectively in 1 kg of water. The ratio of depression in freezing point for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is