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The time
required for 10% completion of a first order reaction at 298 K is

equal
to that required for its 25% completion at 308 K. If the value of A
is

4 ×
10¹⁰ s⁻¹.
Calculate k
at 318 K and E_a.

What will be the ratio $\frac{n_{C{r}_2{O}_7^{2-}}}{n_{S{O}_3^{2-}}}$ when the following redox reaction

$C{r}_2{O}_7^{2-}\left(aq\right)+S{O}_3^{2-}\left(aq\right)\to C{r}^{3+}\left(aq\right)+S{O}_4^{2-}\left(aq\right)$

is balanced in an acidic medium. Where $n$ represents the stoichiometric coefficient of the respective species.

The Van't Hoff factor i for a 0.2 molal aqueous solution of urea is:

Which of the following cannot be a functional isomer?

Predict which of the following will be coloured in aqueous solution? $T{i}^{3+},V^{3+},C{u}^{+},S{e}^{3+},M{n}^{2+},F{e}^{3+}$ and $C{o}^{2+}$. Give reasons for each.

An inorganic substance liberates oxygen on heating and turns an acidic solution of $KI$ brown and reduces acidified $KMn{O}_4$ solution. The substance is:

If NaCl is filed with 10^-2 mol% SrCl_​​​2, what is the concentration of the cation vacancies?

Match the following

$\begin{array}{cc}\text{Compound}& \text{Boiling point}\\ \text{(A) butan-1-ol}& \text{(P)}108{}^{\circ }C\\ \text{(B) butan-2-ol}& \text{(Q)}117{}^{\circ }C\\ \text{(C) 2-methyl propan-1-ol}& \text{(R)}82{}^{\circ }C\\ \text{(D) 2-methyl propan-2-ol}& \text{(S)}100{}^{\circ }C\end{array}$

67.2 L of $O_2$ gas is collected at STP. If 4 mol of $KCl{O}_3$ is used in the following reactions:
$KCl{O}_3\left(s\right)⟶KCl\left(s\right)+O_2\left(g\right)$
$KCl{O}_3⟶KCl{O}_4+KCl$
The number of moles of $KCl{O}_4$ formed would be:

The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is

$\left(A\right)Ni(CO{)}_4$

$\left(B\right)\left[Ni\right(H_{2}O{)}_6]C{l}_2$

$\left(C\right)N{a}_2\left[Ni\right(CN{)}_4]$

$\left(D\right)PdC{l}_2(PP{h}_3{)}_2$

Which one is not equal to zero for an ideal solution ?

equals

A.

B.

C.

D.

A hydrocarbon (X) having formula $C_5{H}_{10}$ reacts with HI to give (Y) which on reacting with alc. KOH forms (Z). The hydrocarbon is

When sugar is dissolved in water, it disappears because the sugar particles _______________.

Which of the following order for basic strength is/are correct?

The rate of gaseous reaction is given by the expression $k\left[A\right]\left[B\right]$. If the volume of the reaction vessel is suddenly reduced to $1/4^{th}$ of the initial volume, the reaction rate relating to original rate will be:

When HNO3 is dropped into the palm and washed with water it turns yellow It’s shows the presence of

NO2

NO

N2O

N2O5

Which of the following alkali metals give nitride on reacting with nitrogen?

Van Arkel method is used for

Select incorrect statement(s):

i) Surface active agent like soaps and synthetic detergents are micelles

ii) Soaps are emulsifying agents

iii) $C_{1}7H_{3}5$ (hydrocarbon part) and $-CO{O}^{-}$ (carboxylate) part of stearate ion $\left(C_{1}7H_{3}5CO{O}^{-}\right)$ both are hydrophobic

iv) Micelles are neutral in charge

Which of the following is/are molecular solid(s)?

find the velocity of photoelectron liberated by electromagnetic radiation of wavelength 18 nm from stationery He + ion in the ground state

Calculate the entropy change when 2 mol of an ideal gas expand isothermally and reversibly from an initial volume of 10 $c{m}^3$ to 100 $d{m}^3$ at 300 K.