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Q. Given below are two statements: Statement I: The number of species among SF4, NH4+, [NiCl4]2-, XeF4, [PtCl4]2-, SeF4 and [Ni(CN)4]2-, that have tetrahedral geometry is 3. Statement II: In the set [NO2, BeH2, BF3, AlCl3], all the molecules have incomplete octet around central atom. In the light of the above statements, choose the correct answer from the options given below: A) Both Statement I and Statement II are true B) Statement I is true but Statement II is false C) Statement I is false but Statement II is true D) Both Statement I and Statement II are false

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JEE Main 2026 Chemistry: Tetrahedral Geometry and Incomplete Octet Analysis Q. Given below are two statements: Statement I: The number […]

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Q. Use the following data: | Substance | ΔfH°(500 K) / kJ mol⁻¹ | S°(500 K) / JK⁻¹ mol⁻¹ | | :— | :—: | :—: | | AB(g) | 32 | 222 | | A₂(g) | 6 | 146 | | B₂(g) | x | 280 | One mole each of A₂(g) and B₂(g) are taken in a 1 L closed flask and allowed to establish the equilibrium at 500 K. A₂(g) + B₂(g) ⇌ 2AB(g) The value of x (in kJ mol⁻¹) is _____. (Nearest integer) (Given: log K = 2.2, R = 8.3 J K⁻¹ mol⁻¹)

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Use the data to find x for the reaction A₂(g) + B₂(g) ⇌ 2AB(g) at 500 K given log K

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Q. Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation energy of second reaction by 20 kJ mol⁻¹. If k₁ and k₂ are the rate constants of first and second reaction respectively at 300 K, then ln (k₂/k₁) will be _____. (nearest integer) [R = 8.3 J K⁻¹ mol⁻¹]

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Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation

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Q. The pH and conductance of a weak acid (HX) was found to be 5 and 4 × 10⁻⁵ S, respectively. The conductance was measured under standard condition using a cell where the electrode plates having a surface area of 1 cm² were at a distance of 15 cm apart. The value of the limiting molar conductivity is _____ Sm² mol⁻¹. (nearest integer) (Given : degree of dissociation of the weak acid (α) ≪ 1 )

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The pH and conductance of a weak acid (HX) was found to be 5 and 4 × 10⁻⁵ S, respectively.

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Q. An organic compound (P) on treatment with aqueous ammonia under hot condition forms compound (Q) which on heating with Br2 and KOH forms compound (R) having molecular formula C6H7N. Names of P, Q and R respectively are: A) Toluic acid, methylbenzamide, 2-methylaniline B) Benzoic acid, benzamide, aniline C) Benzoic acid, 4-methylbenzamide, 4-methylaniline D) Phenylethanoic acid, phenylethanamide, benzamine

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An organic compound (P) on treatment with aqueous ammonia under hot condition forms compound (Q) which on heating with Br2

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14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K . Which of the following statements is incorrect? [Given : Molar mass in \text{gmol}^{-1} of \text{Ca} – 40, \text{Cl} – 35.5, \text{H} – 1] A) The limiting reagent is calcium metal. B) 33.3 g of \text{CaCl}_2 is produced. C) 7.84 L of \text{H}_2 gas is evolved. D) 0.35 mol of \text{H}_2 gas is evolved.

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14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K .

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