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Based on the following thermochemical equations: (i) $H_{2}O(g) + C(s) ightarrow CO(g) + H_{2}(g); \Delta H = 131 ext{ kJ}$ (ii) $CO(g) + rac{1}{2}O_{2}(g) ightarrow CO_{2}(g); \Delta H = -282 ext{ kJ}$ (iii) $H_{2}(g) + rac{1}{2}O_{2}(g) ightarrow H_{2}O(g); \Delta H = -242 ext{ kJ}$ The value of $X$ for the reaction $C(s) + O_{2}(g) ightarrow CO_{2}(g); \Delta H = X ext{ kJ}$ is [CBSE PMT 1992]:

Which of the following equations correctly represents the standard heat of formation (ΔfH°) of methane [IIT JEE (Screening) 1992]?

If for a certain reaction $\Delta_r H$ is $30\text{ kJ mol}^{-1}$ at $450\text{ K}$, the value of $\Delta_r S$ (in $\text{J K}^{-1}\text{ mol}^{-1}$) for which the same reaction will be spontaneous at the same temperature is:

Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats ($C_p/C_v$) of the mixture will be:

The heat of combustion of carbon to $CO_2$ is -393.5 kJ/mol. The heat released upon the formation of 35.2 g of $CO_2$ from carbon and oxygen gas is:

For a sample of perfect gas when its pressure is changed isothermally from $p_i$ to $p_f$, the entropy change is given by:

Enthalpy change for the reaction, $4H(g) \rightarrow 2H_2(g)$ is $-869.6 \text{ kJ}$. The dissociation energy of the H-H bond is:

What is the entropy change (in J K⁻¹ mol⁻¹) when one mole of ice is converted into water at 0 ºC? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol⁻¹ at 0 ºC)

The heat of transition ($\Delta H_t$) of graphite into diamond would be, given the following thermochemical equations: 1. C(graphite) + O$_2$(g) $\rightarrow$ CO$_2$(g); $\Delta H = x$ kJ 2. C(diamond) + O$_2$(g) $\rightarrow$ CO$_2$(g); $\Delta H = y$ kJ

Work done during reversible isothermal expansion of one mole of hydrogen gas at 25°C from a pressure of 20 atmospheres to a pressure of 10 atmospheres is: (Given: R = 2.0 cal K–1 mol–1)

Match List I with List II. List-I (Process) A. Isothermal process B. Isochoric process C. Isobaric process D. Adiabatic process List-II (Conditions) I. No heat exchange II. Carried out at constant temperature III. Carried out at constant volume IV. Carried out at constant pressure Choose the correct answer from the options given below:

Which p-V curve among the following depicts the highest amount of work done?

Determine $\Delta U$ for the process where, one mole of an ideal gas at $300 \text{ K}$ is expanded isothermally from $1 \text{ L}$ to $10 \text{ L}$ volume: (Use $R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$)

In a closed insulated container a liquid is stirred with a paddle to increase the temperature. The correct option regarding this among the following is:

Which of the following is not correct about carbon monoxide?

Anisole on cleavage with HI gives

Which of the following reactions is the metal displacement reaction? Choose the right option.

Given below are two statements : Statement I : Aspirin and Paracetamol belong to the class of narcotic analgesics. Statement II : Morphine and Heroin are non-narcotic analgesics. In the light of the above statements, choose the correct answer from the options given below.

The correct structure of 2, 6-Dimethyl-dec-4-ene is

$CH_3CH_2COO^- Na^+ \xrightarrow[\text{Heat}]{\text{NaOH, ?}} CH_3CH_3 + Na_2CO_3$. Consider the above reaction and identify the missing reagent/chemical.