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Which of the following shows biggest jump in II and III ionization energy:

Redox reaction involves transfer of electrons between 2 chemical species. An unbalanced and incomplete example is shown below:

$N_2+H_{3}P{O}_2\to H{N}_3+P_4{O}_6$



If the above reaction were possible in either direction, maximum equivalent weight would belong to:

[MP PET 2001]

Which of the following compound(s) is/are paramagnetic?

For a cell involving one electron, $E_{cell}^0$ = 0.59 V at 298 K, the equilibrium constant for the cell reaction is:

[Given that $\frac{2.303RT}{F}$ = 0.059 V at T = 298 K]

Assertion: Teflon has high thermal stability and chemical inertness.

Reason: Teflon is a thermoplastic.

Ibuprofen contains:

Which of the nitrogen of histidine is first protonated ?

For an ideal gas, consider only P-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure. Which of the following choices is (are) correct?

[Take $△$S as change in entropy and w as work done].

Equal volume of two gases which do not react together are enclosed in separate vessels. Their pressures are $10\text{mmHg}$ and $400\text{mmHg}$ respectively. If the two vessels are joined together, then what will be the pressure of the resulting mixture (temperature remaining constant)?

Which one of the following characteristics is associated with adsorption?

Select the equation for [B] at any time t in the following reaction. Let the initial concentration of A be $\left[A_0\right]$ and B and C be 0.

Which country was the first to use Chlorine gas as a weapon?

The IUPAC name of the structure

$C{H}_3-CH=\underset{C{H}_3}{\underset{|}{C}}-C\equiv C-C{H}_3$

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed ?

What is the mass of the precipitate formed when $50\text{mL}$ of $16.9\%$ solution of $AgN{O}_3$ is mixed with $50\text{mL}$ of $5.8\%$ $NaCl$ solution ? $(Ag=107.8,N=14,O=16,Na=23,Cl=35.5)$

Find the number of formula units of $FeS{O}_4.7H_{2}O$ present in 11 millimoles of $FeS{O}_4.7H_{2}O$.

Which of the following species are isoelectronic?



$i\left)Neii\right)O^{2-}iii\left)M{g}^{2+}iv\right)F$



$v\left)A{l}^{3+}vi\right)C{l}^{-}vii\left)Kviii\right)Na$

Which of the following plots does not represent Boyle’s law?

Which of the following electronic configuration of an atom has the lowest ionisation enthalpy? [CBSE AIPMT 2007]

Which out of the following is incorrect?

An example of homogeneous catalysis is:

The value of Planck's constant is $6.63\times {10}^{-34}Js.$ The velocity of light is $3\times {10}^{8}m/s.$ If the wavenumber of a quantum of light is $2.5\times {10}^7{m}^{-1}$, calculate its frequency.

According to Bohr, the angular momentum of an electron, in any orbit, should be:

Which of the following is an example for artificial sweetening agent ?

[NCERT
1978; IIT 1999]

What volume of 0.10 M$H_{2}S{O}_4$ must be added to 50 ml of a 0.10 M NaOH solution to make a solution in which the molarity of the$H_{2}S{O}_4$ is 0.050 M?

P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is $4\pi r^2$dr. The qualitative sketch of the dependence of P or r is:

Which of the following mineral does not contain Al ?

Find the mass of $3.011\times {10}^{26}$ molecules of $N{H}_3$ in grams.

A $10g$ sample of $CuS$ and $C{u}_{2}S$ was treated with $100mL$ of $1.25M{K}_{2}C{r}_2{O}_7$ to produce $C{r}^{3+},C{u}^{2+}$ and $S{O}_2$. The excess oxidant was reacted with $50mL$ of $F{e}^{2+}$ solution. $25mL$ of the same $F{e}^{2+}$ solution required $0.875MKMn{O}_4$ under acidic condition, the volume of $KMn{O}_4$ used was $20mL$. Find the percentage of $C{u}_{2}S$ in the sample.

Given: molar mass of $Cu$ is $63.5gmo{l}^{-1}$

Which of the following statements is true in concentration of ore?

Oxidation involves :

The correct order of increasing ionic radius for $F^{-},N{a}^{+},S^{2-},C{l}^{-}$ and $K^{+}$ is:

A compound contains 3.2% by mass of oxygen. The minimum molecular weight of the compound is:

Fluorine has the highest electronegativity among the $n{s}^{2}n{p}^5$ group on the Pauling scale, but the electron affinity of fluorine is less than that of chlorine because-

The $pH$ of $0.1M$ solution of aniline is $8.8$. Its $p{K}_b$ value will be:

Among $LiCl$, $BeC{l}_2$, $BC{l}_3$ and $CC{l}_4$, the covalent bond character follows the order:

Equilibrium constants $K_1$ and $K_2$ for the following equilibria are

$NO\left(g\right)+0.5O_2\left(g\right)\underrightarrow{}{K}_{1}N{O}_2\left(g\right)$ and

$2N{O}_2\left(g\right)\underrightarrow{}{K}_{2}2NO\left(g\right)+O_2\left(g\right)$

Calculate the rms speed of $O_2$ at $273\text{K}$ and $1\times {10}^4\text{Pa}$ pressure. The density of $O_2$ under these conditions is $1.50{\text{kg m}}^{-3}$.

Match the followings

$\begin{array}{cccc}& \text{List-I}& & \text{List-II}\\ \left(I\right)& \text{Cathode rays}& \left(P\right)& \text{Helium nuclei}\\ \left(II\right)& \text{Alpha particles}& \left(Q\right)& \text{Uncertainty principle}\\ \left(III\right)& \text{J.J. Thomson}& \left(R\right)& \text{Electromagnetic radiation}\\ \left(IV\right)& \text{X-rays}& \left(S\right)& \text{Plum Pudding Model}\\ & & \left(T\right)& \text{Atomic number}\\ & & \left(U\right)& \text{Electrons}\end{array}$

The equilibrium constant for the following reaction is $1.6\times {10}^5$ at $1024K$ $H_2\left(g\right)+B{r}_2\left(g\right)\rightleftharpoons 2HBr\left(g\right)$

Find the equilibrium pressure of $H_2$ gas if $10.0bar$ of $HBr$ is introduced into a sealed container at $1024K$.

Which one of the following is non-ideal solution?

Select the pair of compounds that exhibit cis-trans (geometric) isomerism:

The maximum number of electrons in d subshell is equal to