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Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :



Then the species undergoing disproportionation is:

The combustion of hydrogen-oxygen mixture is used to produce very high temperatures $(\approx {2500}^{o}C)$ needed for certain types of welding operations.

$H_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\to H_{2}O\left(g\right);△H=-230.9kJ$

Quantity of heat, (in kJ) evolved when a 200 g mixture containing equal parts of $H_2$ and $O_2$ by mass is burned, is

The distance between any two $I$ atoms in $B{I}_3$ is found to be $3.46\stackrel{o}{A}$. What is the covalent radius of boron. If covalent radius of $I$ atom is $1.33\stackrel{o}{A}$? (Assume all bonds are single bonds in $B{I}_3$)

(Given, $\sqrt{3}=1.73,\sqrt{3}.99=1.99$)

Which of the following is
contributed towards the extra stability of lyophilic colloids

Helium gas at 1 atm and $S{O}_2$ at 2 atm pressure, temperature being the same, are released seprately at the same moment into 1m long evacuated tubes of equal diameters. If helium reaches the other end of the tube in ts, what distance $S{O}_2$ would traverse in the same time interval in the other tube ?

The edge length of a unit cell of a metal whose molecular weight is 75 g/mol is 5 angstrom. This crystallises in a cubic lattice. If the density is 2 g/cc, find the radius of the metal atom. Give the answer in pm.

$N_A=6\times {10}^{2}3$

Find the major product in the following reaction.

$C{H}_3-\stackrel{O}{\stackrel{||}{C}}H\underset{Conc.HCl}{\overset{Zn-Hg}{\to }}$

Tertiary butyl amine is

What occurs when an atom is oxidized in a chemical reaction?

Which of the following compounds is least stable?

What is the correct condensed representation of the following structure?

A $10.0\text{cm}$ column of air is trapped by a column of 4 cm long $Hg$ in a capillary tube of uniform bore when the tube is held horizontally at $1\text{atm}$. The length of the air column when the tube is held vertically with the open end up is:

Given: $P_{atm}=76$ cm of Hg

Which of the following is an example of nucleophilic addition ?

Increasing order of basic character of $MgO,SrO,K_{2}O,NiO\text{and}C{s}_{2}O$

Ozone in the stratosphere is depleted by:

The major product of the following reaction is: $R-\mathrm{CN}\underset{2.H_{2}O}{\overset{1.\mathrm{AlH}{(i-\mathrm{Bu})}_2,}{\to }}?$

Potassium acid oxalate $K_2{C}_2{O}_4.3H_2{C}_2{O}_4.4H_{2}O$ can be oxidized by $Mn{O}_4^{-}$ in acidic medium. Calculate the volume of $0.3MMn{O}_4^{-}$ reacting in acid solution with $10.16g$ of the acid oxalate.

(Molar mass of potassium acid oxalate is $508gmo{l}^{-1}$.)

Which trihalide is not hydrolysed by water?

Multiple covalent bonds exists in :

The difference in the number of water molecules in gypsum and plaster of paris is:

The $K_{sp}$ of $A{g}_{2}Cr{O}_4,AgCl,AgBr$ and AgI are respectively, $1.1\times {10}^{-12},1.8\times {10}^{-10},5.0\times {10}^{-13},8.3\times {10}^{-17}$. Which one of the following salts will precipitate last if $AgN{O}_3$ solution is added to the solution containing equal moles of NaCl, NaBr, Nal and $N{a}_{2}Cr{O}_4$?

A saturated compound C₅H₁₂ on Mono chlorination given only one product. The compound is:

[BHU 2000; Pb. PMT 2000; Kerala 2003]

Which of the following does not form phenol or phenoxide [AFMC 2000]

The process that requires an absorption of energy is:

The compressibility factor for a real gas at high pressure is

Which of the following do not have unpaired $e^{-}$?

In basic dyes which of the following group is present?

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. The compound F is:

Which of the following H-bonds is expected to have maximum strength?

Which of the following molcules has a linear shape?

Which of the following has an optical isomer?

For one mole of a van der Waal's gas when b =o and T = 300 K, the PV vs $\frac{1}{V}$ plot is shown below. The value of the Van der Waal's constant "a" ($atm{L}^{2}mo{l}^{-2}$) is

Identify the pollutant gases which are responsible for the discolouration of marbles in the Taj Mahal.

The density of Ne is maximum at

Formalin is :

Calculate the magnitude of spin angular momentum of an electron.

When excess of $C{l}_2$ reacts with ammonia, the products formed are:

An aqueous solution of ammonium acetate is

Which of the following electronic configuration is that of a transition element?

0.242 g sample of K is heated in the presence of oxygen gas. This resulted in the formation of 0.440 g of a crystalline compound. What is the formula of this compound?

Which of the following does NOT affect the rate of a chemical reaction?

Which of the following reaction indicates the presence of primary alcoholic group in glucose?

Large-scale manufacture of nitric acid by Ostawald process utilizes the reaction-

The correct order of increasing $C-O$ bond length of $CO,C{O}_3^{2-}\text{and}C{O}_2$ is: