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What is the relationship between average rate of reaction and instantaneous rate of reaction?

Which are the starting materials for the preparation of

Half-lives of a first order and a zero order reaction are the same. The ratio of initial rates of the first order reaction to that of the zero order reaction is :

When diazonium salt solution is treated with water at a temperature of 283 K it forms?

Which of the following has least pH value ?

Heat change of a process in which volume remains constant is given by:

The number of peroxide bonds in perxenate ion $[Xe{O}_6{]}^{4-}$ is:

Which of the following has highest octane number

Arrange the following compounds in order of increasing dipole moment.

(I)Toluene (II) m - dichlorobenzene

(III)o - dichlorobenzene (IV)p - dichlorobenzene

Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation:
$2H_2{O}_2\left(aq\right)\to 2H_{2}O\left(l\right)+O_2\left(g\right)$
under conditions where $1$ mole of gas occupies $24d{m}^3.100c{m}^3$ of $XM$ solution of $H_2{O}_2$ produces $3d{m}^3$ of $O_2$ Thus, $X$ is:

A photo sensitive surface is receiving light of wavelength $5000\stackrel{o}{\text{A}}$ at the rate of ${10}^{-7}\text{J/s}$. The number of photons received per second is:

1. $4.2\%$

Formalin is :

Arrange the following compounds in the order of decreasing molar conductivity in aqueous solution.
a. K[Co$\left(N{H}_3{)}_2\right(N{O}_2{)}_4$]
b. [Cr$\left(N{H}_3{)}_3\right(N{O}_2{)}_3$]
c. $\left[Cr\right(N{H}_3{)}_5\left(N{O}_2\right){]}_3\left[Co\right(N{O}_2{)}_6{]}_2$
d. Mg[Cr$\left(N{H}_3\right)(N{O}_2{)}_5$]

In the manufacture of sodium hydroxide, by product obtained is:

Among the following, the compound that is both paramagnetic and coloured is

$C{H}_{3}CH=C{H}_2+B\stackrel{.}{r}\to C{H}_3\stackrel{.}{C}{H}_{2}Br$

The mass average molecular mass & number average molecular mass of a polymer are respectively 40,000 and 30,000. The polydispersity index of polymer will be ?

In closest packing of A type of atoms (radius, rA), the radius of atom B that can be fitted into Octahedral void is

The number of bonds between sulphur and oxygen atoms in $S_2{O}_8^{2-}$ and number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are:

Which of the following produces $PC{l}_3$ ?

A compound containing two ―OH groups attached with one carbon atom is unstable but which one of the following is stable?

A balloon contains $500m^3$ of helium at ${27}^{\circ }C$ and 1 atmosphere pressure. The volume of the helium at $–3^{\circ }C$ temperature and 0.5 atmosphere pressure will be

For the second period elements, the correct increasing order of first ionisation enthalpy is:

The correct stability order for the following species is:

The pH of a sample of vinegar is 3.76. Calculate the concentration of hydrogen ion in it.

Write the significance of a plus and a minus sign shown in representing the orbitals.

A compound contains equal masses of the element A, B and C. The atomic mass of A, B and C are 20 u, 40 u and 60 u respectively. The empirical formula of the compound is:

Name the common elements presents in the anode mud in electrolytic refining of copper. Why are they so present?

Which of the following statements are applicable to a balanced chemical equation of an elementary reaction?
(a) Order is same as molecularity
(b) Order is less than the molecularity
(c) order is greater than the molecularity
(d) Molecularity can never be zero

Which is the monomer of neoprene in the following ?

At 291 K, the molar conductivities at infinite dilution of $N{H}_{4}Cl,NaOH$ and $NaCl$ are 129.8, 217.4 and $108.9Sc{m}^{2}mo{l}^{-1}$ respectively . If the molar conductivity of a centinormal solution of $N{H}_{4}OH$ is $9.532Sc{m}^{2}mo{l}^{-1}$, then calculate the dissociation constant of $N{H}_{4}OH$?

If $N{a}^{+}$ is larger than $M{g}^{2+}$ ion and $S^{2-}$ ion is larger than $C{l}^{-}$ ion, which of the following will be the least soluble in water?

What is meaning of U in wavy curve methode ?

Calculate the wavelength of a photon having an energy of 3 eV. Take $h=6.6\times {10}^{-34}Js$

Crystal field splitting energy (CFSE) for the complex $\left[Fe\right(CN{)}_4{]}^{-}$ is ____ ,when $\Delta >P$.

A mixture of $KBr$ and $NaBr$ weighing 0.560 g was treated with aq. $A{g}^{+}$ ion and all bromide ion was recovered as 0.970 g of pure $AgBr.$ What was the fraction by weight of $KBr$ in the sample?

Metal oxides which decomposes on heating is