Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
The work done during the expansion of a gas from a volume of $4\text{ dm}^3$ to $6\text{ dm}^3$ against a constant external pressure of $3\text{ atm}$ is:
For irreversible expansion of an ideal gas under isothermal conditions, the correct option is:
For a given reaction, if $\Delta H = 35.5 \text{ kJ/mol}$ and $\Delta S = 83.6 \text{ J/K}\cdot\text{mol}$, at what temperature is the reaction spontaneous? (Assume $\Delta H$ and $\Delta S$ remain constant with temperature.)
Consider the following reactions: (i) $H^+(aq) + OH^-(aq) \rightarrow H_2O(l); \Delta H = -x_1 \text{ kJ mol}^{-1}$ (ii) $H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l); \Delta H = -x_2 \text{ kJ mol}^{-1}$ (iii) $CO_2(g) + H_2(g) \rightarrow CO(g) + H_2O(l); \Delta H = -x_3 \text{ kJ mol}^{-1}$ (iv) $C_2H_5(g) + \frac{5}{2}O_2(g) \rightarrow 2CO_2(g) + H_2O(l); \Delta H = -x_4 \text{ kJ mol}^{-1}$ Enthalpy of formation of $H_2O(l)$ is:
The formation of a solution from two components can be considered as: (i) Pure solvent → separated solvent molecules, ∆H₁ (ii) Pure solute → separated solute molecules, ∆H₂ (iii) Separated solvent and solute molecules → solution, ∆H₃ The solution so formed will be ideal if:
Match the processes or properties in List-I with their corresponding characteristics in List-II. List-I (Process/Property) A. Adiabatic process B. Reversible process C. Intensive property D. Extensive property List-II (Characteristic) I. Independent of the amount of substance II. The reaction can proceed in both directions, from reactants to products and vice versa III. No transfer of heat between the system and the surrounding IV. Dependent on the amount of substance Choose the correct answer from the options given below:
The incorrect statement among the following is :
Identify the correct statements from the following: (a) $CO_2(g)$ is used as refrigerant for ice-cream and frozen food. (b) The structure of $C_{60}$ contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.
Statement I : Acid strength increases in the order given as $HF << HCl << HBr << HI$. Statement II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.
Identify the incorrect statement.
The following solutions were prepared by dissolving 10 g of glucose ($C_6H_{12}O_6$) in 250 ml of water ($P_1$), 10 g of urea ($CH_4N_2O$) in 250 ml of water ($P_2$) and 10 g of sucrose ($C_{12}H_{22}O_{11}$) in 250 ml of water ($P_3$). The right option for the decreasing order of osmotic pressure of these solutions is :
Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures :
Match List-I with List-II. List-I: (a) 2SO_2(g) + O_2(g) -> 2SO_3(g) (b) HOCl(g) --hv--> OH + Cl (c) CaCO_3 + H_2SO_4 -> CaSO_4 + H_2O + CO_2 (d) NO_2(g) --hv--> NO(g) + O(g) List-II: (i) Acid rain (ii) Smog (iii) Ozone depletion (iv) Tropospheric pollution
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): $ICl$ is more reactive than $I_2$. Reason (R): $I-Cl$ bond is weaker than $I-I$ bond. In the light of the above statements, choose the most appropriate answer from the options given below:
HCl was passed through a solution of $CaCl_2$, $MgCl_2$ and $NaCl$. compound(s) crystallise(s)?
Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
The non-essential amino acid among the following is:
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of ?
The IUPAC name of an element with atomic number 119 is:
Match the reactions listed in List-I with the appropriate reagents or conditions listed in List-II: **List-I (Reaction)** Data Missing **List-II (Reagents/ Condition)** I. Data Missing II. $CrO_3$ III. $KMnO_4, KOH, \Delta$ IV. (i) $O_3$ (ii) $Zn-H_2O$ Choose the correct answer from the options given below: