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Chemistry

120 g of an organic compound that contains only carbon and hydrogen gives 330 g of $\text{CO}_2$ and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are:

The energy of one mole of photons of radiation of wavelength \( 300 \) \( \text{nm} \) is (Given : \( h = 6.63 \times 10^{-34} \) \( \text{J s} \), \( N_{A} = 6.02 \times 10^{23} \) \( \text{mol}^{-1} \), \( c = 3 \times 10^{8} \) \( \text{m s}^{-1} \) )

The correct order of bond orders of \( \text{C}_2^{2-} \), \( \text{N}_2^{2-} \) and \( \text{O}_2^{2-} \) is, respectively:

At \( 25^{\circ} \text{C} \) and \( 1 \) \( \text{atm} \) pressure, the enthalpies of combustion are as given below:

The enthalpy of formation of ethane is:

For a first order reaction, the time required for completion of \( 90 \% \) reaction is ‘\( x \)’ times the half life of the reaction. The value of \(' x' \) is : (Given : \( \ln 10 = 2.303 \) and \( \log 2 = 0.3010 \))

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be:

Which of the following chemical reactions represents Hall-Heroult Process?

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

Which one of the following compounds is used as a chemical in certain type of fire extinguisher?

\( \mathrm{PCl_5} \) is well known, but \( \mathrm{NCl_5} \) is not. Because,

Transition metal complex with highest value of crystal field splitting \( (\Delta_0) \) will be:

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

Arrange the following carbocations in decreasing order of stability.

Given below are two statements.
Statement I: The presence of weaker \( \pi \)- bonds make alkenes less stable then alkanes.
Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following reagents / reactions will convert 'A' to 'B'?

Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is:

The conversion of propan-1-ol to n-butylamine involves the sequential addition of reagents. The correct sequential order of reagents is:

Which of the following is not an example of a condensation polymer?

The structure shown below is of which well-known drug molecule?

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

At \( 300 \, \mathrm{K} \), a sample of \( 3.0 \, \mathrm{g} \) of gas A occupies the same volume as \( 0.2 \, \mathrm{g} \) of hydrogen at \( 200 \, \mathrm{K} \) at the same pressure. The molar mass of gas A is _______ \( \mathrm{g \, mol^{-1}} \). (nearest integer) Assume that the behavior of gases as ideal. (Given: The molar mass of hydrogen (\( \mathrm{H_2} \)) gas is \( 2.0 \, \mathrm{g \, mol^{-1}} \).)

A company dissolves ‘x’ amount of \( \mathrm{CO_2} \) at \( 298 \, \mathrm{K} \) in \( 1 \) litre of water to prepare soda water. \( X = \) _______ \( \times 10^{-3} \, \mathrm{g} \). (nearest integer)
(Given: partial pressure of \( \mathrm{CO_2} \) at \( 298 \, \mathrm{K} = 0.835 \, \mathrm{bar} \).
Henry’s law constant for \( \mathrm{CO_2} \) at \( 298 \, \mathrm{K} = 1.67 \, k \, \mathrm{bar} \).
Atomic mass of H, C and O is \( 1 \), \( 12 \), and \( 6 \, \mathrm{g \, mol^{-1}} \), respectively)

$\text{PCl}_5$ dissociates as

$\text{PCl}_5(\text{g}) \rightleftharpoons \text{PCl}_3(\text{g}) + \text{Cl}_2(\text{g})$

5 moles of $\text{PCl}_5$ are placed in a 200 litre vessel which contains 2 moles of $\text{N}_2$ and is maintained at 600 K. The equilibrium pressure is 2.46 atm. The equilibrium constant $\text{K}_\text{p}$ for the dissociation of $\text{PCl}_5$ is $\underline{\qquad} \times 10^{-3}$. (nearest integer)

(Given : $\text{R} = 0.082 \text{ L atm K}^{-1}\text{ mol}^{-1}$; Assume ideal gas behaviour)

The resistance of a conductivity cell containing \( 0.01 \, \mathrm{M} \) \( \mathrm{KCl} \) solution at \( 298 \, \mathrm{K} \) is \( 1750 \, \Omega \). If the conductivity of \( 0.01 \, \mathrm{M} \) \( \mathrm{KCl} \) solution at \( 298 \, \mathrm{K} \) is \( 0.152 \times 10^{-3} \, \mathrm{S \, cm^{-1}} \), then the cell constant of the conductivity cell is _______ \( \times 10^{-3} \, \mathrm{cm^{-1}} \).

When \( 200 \, \text{mL} \) of \( 0.2 \, \text{M} \) acetic acid is shaken with \( 0.6 \, \text{g} \) of wookd charcoal, the final concentration of acetic acid after adsorption is \( 0.1 \, \text{M} \). The mass of acetic acid adsorbed per gram of carbon is __________ \( \text{g} \).

(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

Manganese \( (\text{VI}) \) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is __________.

\( 0.2 \, \text{g} \) of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of \( \text{N}_2 \) evolved (at STP) was found to be \( 22.400 \, \text{mL} \). The percentage of nitrogen in the compound is __________. [nearest integer]
(Given: Molar mass of \( \text{N}_2 \) is \( 28 \, \text{g mol}^{-1} \), Molar volume of \( \text{N}_2 \) at STP : \( 22.4 \, \text{L} \))

Consider the above reaction. The number of \( \pi \) electrons present in the product ‘P’ is __________.

In alanylglycylleucylalanylvaline, the number of peptide linkages is __________.

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Which of the following reagents / reactions will convert 'A' to 'B'?