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Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :
Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water? The heats of solution ($\Delta H_{sol}$) of these compounds at $25^{\circ}C$ in kJ/mol of each solute are given in brackets [AMU (Engg.) 2000]:
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $\Delta U$ of the gas in joules will be:
Enthalpy of combustion of carbon to carbon dioxide is −390.0 kJ mol⁻¹. The amount of heat released when 35.0 g of CO2 is formed from the reaction of carbon and dioxygen gas, is:
Heat of combustion $\Delta H^\circ$ for $C(s)$, $H_2(g)$ and $CH_4(g)$ are $-94$, $-68$ and $-213\text{ Kcal/mol}$. $\Delta H^\circ$ for $C(s) + 2H_2(g) \rightarrow CH_4 (g)$ is:
Consider the following processes: $\frac{1}{2}\text{A} \rightarrow \text{B}; \Delta H = +150\text{ kJ/mol}$ $3\text{B} \rightarrow 2\text{C} + \text{D}; \Delta H = -125\text{ kJ/mol}$ $\text{E} + \text{A} \rightarrow 2\text{D}; \Delta H = +350\text{ kJ/mol}$ For $\text{B} + \text{D} \rightarrow \text{E} + 2\text{C}, \Delta H$ will be:
The bond energy of H—H and Cl—Cl is $430 \text{ kJ mol}^{-1}$ and $240 \text{ kJ mol}^{-1}$ respectively and $\Delta_f H$ for HCl is $-90 \text{ kJ mol}^{-1}$. The bond enthalpy of HCl is:
The standard enthalpy of vaporisation $\Delta_{vap}H^{\circ}$ for water at $100^{\circ}\text{C}$ is $40.66 \text{ kJ mol}^{-1}$. The internal energy of vaporisation of water at $100^{\circ}\text{C}$ (in $\text{kJ mol}^{-1}$) is: (Assume water vapour to behave like an ideal gas)
A process among the following shows decrease in entropy is :
What is the IUPAC name of the organic compound formed in the following chemical reaction? Acetone $\xrightarrow[(ii) H_2O, H^+]{(i) C_2H_5MgBr, dry Ether}$ Product
The work done when $1 \text{ mole}$ of gas expands reversibly and isothermally from a pressure of $5 \text{ atm}$ to $1 \text{ atm}$ at $300 \text{ K}$ is: [Given: $\log 5 = 0.6989$ and $R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$]
The molar conductivity of 0.007 M acetic acid is 20 S cm$^2$ mol$^{-1}$. What is the dissociation constant of acetic acid? Choose the correct option. $\left[ \Lambda_{H^+}^\circ = 350 \text{ S cm}^2 \text{ mol}^{-1}, \Lambda_{CH_3COO^-}^\circ = 50 \text{ S cm}^2 \text{ mol}^{-1} \right]$
Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.
The slope of Arrhenius plot $\left( \ln k \text{ v/s } \frac{1}{T} \right)$ of first order reaction is $-5 \times 10^3 \text{K}$. The value of $E_a$ of the reaction is. Choose the correct option for your answer. [Given $R = 8.314 \text{ JK}^{-1}\text{mol}^{-1}$]
The intermediate compound 'X' in the following chemical reaction is:
Which of the following molecules is non-polar in nature?
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.
Boric acid is an acid because its molecule
Deficiency of vitamin B1 causes the disease:
Given below are two statements: Statement I: Aniline does not undergo Friedel-Crafts alkylation reaction. Statement II: Aniline cannot be prepared through Gabriel synthesis.