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On increasing the temperature of the reacting system by 10^o the rate of reaction becomes almost double. The most appropriate reason for this is

To synthesize the given compound via an $S_{N}2$ reaction, themost appropriate combination is:

Given $C_{\left(graphite\right)}+O_2\left(g\right)\to C{O}_2\left(g\right);$



${\Delta }_f{H}^{\circ }=-393.5kJmo{l}^{-1}$



$H_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\to H_{2}O\left(l\right)$



${\Delta }_f{H}^{\circ }=-285.8kJmo{l}^{-1}$



$C{O}_2\left(g\right)+2H_{2}O\left(l\right)\to C{H}_4\left(g\right)+2O_2\left(g\right)$



${\Delta }_f{H}^{\circ }=+890.3kJmo{l}^{-1}$



Based on the above thermochemical equations, the value of ${\Delta }_f{H}^{\circ }$ at 298 K for the reaction



$C_{\left(graphite\right)}+2H_2\left(g\right)\to C{H}_4\left(g\right)$ will be:

The standard enthalpy of combustion at ${25}^{o}C$ of hydrogen, cyclohexene ($C_6{H}_{10}$) and cyclohexane ($C_6{H}_{12}$ ) are $-241,-3800and-3920kJmo{l}^{-1}$ respectively. Calculate the heat of hydrogenation of cyclohexene ( in $kJmo{l}^{-1}$)

For the first order decomposition reaction of $N_2{O}_5$, it is observed that

$\left(i\right)N_2{O}_5\left(g\right)\to 2N{O}_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right);\frac{-d\left[N_2{O}_5\right]}{dt}=k\left[N_2{O}_5\right]\left(ii\right)2N_2{O}_5\left(g\right)\to 4N{O}_2\left(g\right)+O_2\left(g\right);\frac{-d\left[N_2{O}_5\right]}{dt}=k^{\prime }\left[N_2{O}_5\right]$

Which of the following is true?

Which of the following aqueous solution will conduct an electric current quite well

[MP PMT 1987]

1g mixture of CaCO₃ and NaCl reacts completely with 100 ml of N/10 HCl. The % of CaCO₃ in the mixture is

What is the common name of coconut fibres?

I- ion react with iodine in aqueous solution to form I3- ion .When 1L of solution containing 1mole of KI and 0.25 mol of I2 was reacted with excess of AgNO3 ,0.80 mol of yellow precipitate was formed.The stability constant of. I3- ion is

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling's solution. It however, reacts with grignard reagent and gives positive iodoform test. The compound is:

The enol form of:

Which of the following thermodynamic relation is incorrect?

A radioactive isotope having a half life of $3\text{days}$ was received after $9\text{days}$. It was found that there was only $4\text{gm}$ of the isotope in the container. The initial weight of the isotope when packed was

The temperature at which a real gas obeys the ideal gas laws over a fairly wide range of pressure is _____.

The silver salt of a monobasic acid on ignition gave $60\%$ of Ag. The molecular weight of the acid is(aomic weight of Ag is 108)

The weakest base among the following is

A mixture of liquid showing positive deviation in Raoult's law is