202596 marks24 questions
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Source: JEE (Main) 2025, Paper 1 (B.E./B.Tech), 23 Jan 2025 Shift 2, Chemistry, published by NTA. The official PDF
Standard electrode potentials for a few half cells are mentioned below : E°Cu²⁺/Cu = 0.34 V, E°Zn²⁺/Zn = −0.76 V E°Ag⁺/Ag = 0.80 V, E°Mg²⁺/Mg = −2.37 V Which one of the following cells gives the most negative value of ΔG° ?
When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg. The mole fraction of the solute in the solution is 0.2. What would be the mole fraction of the solvent if decrease in vapour pressure is 20 mm of Hg?
Consider a binary solution of two volatile liquid components 1 and 2. x₁ and y₁ are the mole fractions of component 1 in liquid and vapour phase, respectively. The slope and intercept of the linear plot of 1/x₁ vs 1/y₁ are given respectively as :
pH of water is 7 at 25°C. If water is heated to 80°C, its pH will:
Match List - I with List - II. List - I:
Given below are two statements: Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms. Statement (II): The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes. In the light of the above statements, choose the correct answer from the options given below:
The α - Helix and β - Pleated sheet structures of protein are associated with its:
When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ________. (Nearest integer) Given: Molar mass of Al is 27.0 g mol⁻¹ Molar mass of O is 16.0 g mol⁻¹
The bond dissociation enthalpy of X₂, ΔH°bond calculated from the given data is ________ kJ mol⁻¹. (Nearest integer) M⁺X⁻(s) → M⁺(g) + X⁻(g) ΔH°lattice = 800 kJ mol⁻¹ M(s) → M(g) ΔH°sub = 100 kJ mol⁻¹ M(g) → M⁺(g) + e⁻(g) ΔH°i = 500 kJ mol⁻¹ X(g) + e⁻(g) → X⁻(g) ΔH°eg = −300 kJ mol⁻¹ M(s) + ½X₂(g) → M⁺X⁻(s) ΔH°f = −400 kJ mol⁻¹ [Given: M⁺X⁻ is a pure ionic compound and X forms a diatomic molecule X₂ in gaseous state]
0.01 mole of an organic compound (X) containing 10% hydrogen, on complete combustion produced 0.9 g H₂O. Molar mass of (X) is ________ g mol⁻¹.