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Calculate the enthalpy change $\left(△H\right)$ of the following reaction

$2C_2{H}_2\left(g\right)+5O_2\left(g\right)\to 4C{O}_2\left(g\right)+2H_{2}O\left(g\right)$ given average bond enthalpies of various bonds, i.e., $C-H,C\equiv C,O=O,C=O,O-H$ as 414, 814 499, 724 and 640 $kJmo{l}^{-1}$ respectively.

The order of strength of hydrogen bond is:

Which of the following is identified by carbyl amine reaction

Ground state electronic configuration of nitrogen atom can be represented by

Chlorination of isobutane mainly gives

Calculate the number of photons emitted per second by a $10\text{W}$ sodium vapour lamp. Assume that $60\%$ of the consumed energy is converted into light. Wavelength of sodium light is $662\text{nm}$.

(Given that $h=6.62\times {10}^{-34}\text{J s}$)

In $C+H_{2}O\to CO+H_2$

$H_{2}O$ acts as

Among the following, the molecule with the highest dipole moment is

[IIT-JEE (Screening) 2003]

Strength of acidity is in order:

The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinities:

$i.2s^{2}2p^5$ $ii.3s^{2}3p^5$

$iii.2s^{2}2p^4$ $iv.3s^{2}3p^4$

Select the correct answer using the codes given below:

The most stable enol form of the following compound is :

Glucose and cane sugar can't be distinguished by

In $K_{4}Fe(CN{)}_6$

The molar ionic conductances at infinite dilution of $M{g}^{2+}$ and $C{l}^{-}$ are 106.1 and 76.3 $oh{m}^{-1}oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ respectively. The Molar conductance of solution of $MgC{l}_2$ at

infinite dilution is

In an electroplating experiment m g of silver is deposited, when 4 amperes

of current flows for 2 minutes. The amount (in gms) of silver deposited by 6

amperes of current flowing for 40 seconds will be

[MNR 1991]

Which represents an alkane

Vapour pressure of CCl₄ at 25⁰C is 143mm of Hg. 0.5 gm of a non-volatile solute (mol. wt. = 65) is dissolved in 100ml CCl₄. Find the vapour pressure of the solution (Density of CCl₄=1.58g/cm²)

Two successive reactions, $A\to B$ and $B\to C$ have yields of $80\%$ and $80\%$, respectively. What is the overall percentage yield for conversion of $A$ to $C$?

When 0.05 moles of $H_2$ is mixed with $CO$, what is the number of moles of methanol $\left(C{H}_{3}OH\right)$ that can be obtained? ($C{H}_{3}OH$ is the only product)

A compound A with molecular formula $C_{10}{H}_{13}Cl$ gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis gives C and D. C gives Cannizaro reaction but not alodol condensation. D gives aldol condensation but not Cannizaro reaction. A is:

The volume of colloidal particle $V_c$ as comapred to the volume of solute particle in a true solution $V_s$ could be

The order of decreasing nucleophilicity is

The increasing order of the rate of HCN addition to compounds A-D is:

(A) $HCHO$ (B) $C{H}_{3}COC{H}_3$

(C) $PhCOC{H}_3$ (D) $PhCOPh$

Consider a reaction:

$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$

Given that ,

$K_{eq}=7\times {10}^5$

$\Delta S_{N{H}_3}^{\circ }=-23.66calmo{l}^{-1}{K}^{-1}$

Both the values are at 300K

Find the value of $\Delta H_{N{H}_3}^{\circ }$ at 300 K

Take $ln\left(7\right)=1.95$

2- bromo butane $\stackrel{15\%aqsolnofEtOH}{\to }P$

In this reaction 70% recemisation takesplace % of inverted product would be:

The equivalent mass of a certain bivalent metal is $25\text{g}$. The gram molar mass of its anhydrous chloride is:

For a given reaction:

$C\left(s\right)+O_2\left(g\right)\to Co\left(g\right)+H_2\left(g\right)$ at ${25}^{o}C$ $\Delta H=131kJ/mol$

Given: $K_p$ = $9.36\times {10}^{-17}$

Calculate the value of reaction constant at ${700}^{o}C$.

Which of the following reactions will yield 2,2-dibromopropane?

What is the molality of pure water

Which compound would give 5-keto-2-methylhexanal upon ozonolysis?

Which contains both covalent and ionic bonds?

Calculate free energy change for the following reaction at $298K$:

$2NO\left(g\right)+B{r}_2\left(l\right)\to 2NOBr\left(g\right)$

Given the partial pressure of $NO$ is $0.1\text{atm}$ and the partial pressure of $NOBr$ is $2.0atm$ and $\Delta G_{fNOBr}^0=82.4{\text{kJ mol}}^{-1},\Delta G_{NO}^0=86.55{\text{kJ mol}}^{-1}$

The pH of blood is 7.4. If the buffer in bloods is $C{O}_{2}andHC{O}_3^{-}$, calculate the ratio of conjugate base to acid $\left(H_{2}C{O}_3\right)$ to maintain the pH of the blood. Given $K_1$ of $H_{2}C{O}_3=4.5\times {10}^{-7}$

Explain the following:

Phenol is less acidic than [IIT-JEE 1986; UPSEAT 2003; Orissa JEE 2004]

Which of the following reaction(s) is/are not representing the correct major product?

A solution of (-) - 1 - chloro - 1 - phenylethane in toluene racemises slowly in the presence of a small amount of $SbC{l}_5$, due to the formation of:

Solid CO₂ is an example of

The correct orientations of dipoles in pyrrole and pyridine is:

Sort the acids according to their strengths in the decreasing order.

Calculate work done $w$ for the conversion of $0.5$ moles of water at $100{}^{\circ }C$ to steam at $1atm$ pressure. Heat of vaporisation of water at $100{}^{\circ }C$ is $40670Jmo{l}^{-1}$

The d - electron configurations of $M{n}^{2+},F{e}^{2+},C{o}^{3+},andN{i}^{2+}are3d^5,3d^6,3d^6,3d^8,$ respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior?

Species that are formed in one step of reaction mechanism and used up in another step are called

The enthalpy of hydrogenation of cyclohexene is $-119.5kJ/mol$. If resonance energy of benzene is $-150.4kJ/mol$ then its enthalpy of hydrogenation would be:

1.25 moles of a gas A and y moles of a gas B exert a pressure of 300 Pa in a container of volume $10m^3$ at $1000K$. Find the value of y in terms of R (where R is the gas constant in $J{K}^{-1}mo{l}^{-1}$ )

For the reaction $H_{2}O\left(s\right)\leftrightharpoons H_{2}O\left(l\right)$ at 0°C and normal pressure