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Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with
Iron

Write the ionic equations for the reactions.

(i) Ions
(ii) $S{o}_2$
(iii) Oxalic acid
Write the ionic equations for the reactions.

Which aqueous solution has greater concentration - 1 molar or 1 molal of the same solute ? Give reason.

In ABO blood group how many phenotype are found?

A)1

B)4

C)6

D)8

Column-I contains binary liquid mixture in ether and column-II contains method used for separation.

$\begin{array}{cccc}& \text{Column-I}& & \text{Column-II}\\ \text{P.}& \text{Aniline + N-methyl aniline}& \text{1.}& \text{i. Addition of}\left[Ag\right(N{H}_3{)}_2{]}^{+}\\ & & & \text{ii. Filteration}\\ & & & \text{iii. Treating precipitate with dil.}HCl\\ \text{Q.}& \text{Phthalimide + Benzyl amine}& \text{2.}& \text{i. Addition of}{C}_6{H}_{5}S{O}_{2}Cl+aq.NaOH\\ & & & \text{ii. Treating aq. layer with dil.}HCl\\ & & & \text{and distilled over}NaOH\\ \text{R.}& \text{Propan-1-ol + Propanone}& \text{3.}& \text{i. Addition of}NaOH\\ & & & \text{ii. Treating aqueous with}HCl\\ \text{S.}& \text{But-1-yne + But-2-yne}& \text{4.}& \text{i. Addition of saturated}NaHS{O}_3\\ & & & \text{ii. Filteration}\\ & & & \text{iii. Heating precipitate with dil.}HCl\end{array}$

Select the correct option considering column-I and column-II.

8.96 L of $C{l}_2$ gas which is at STP is mixed with 100 mL of 5 M $Ca(OH{)}_2$ which reacts as follows:
$2Ca(OH{)}_2+2C{l}_2\to Ca(OCl{)}_2+CaC{l}_2+2H_{2}O$

Find the number of chlorine atoms present in $Ca(OCl{)}_2$ that is formed.

2M of 100 ml Na₂SO₄ is mixed with 3M of 100ml NaCl solution and 1M of 200 ml CaCl₂ solution. Then the ratio of the concentration of cation and anion

A) 1/2

B) 2

C) 1.5

D) 1

If the binding energy of 2nd excited state of a hydrogen like sample is 24 eV approximately, then the ionization energy of the sample is approximately:

In adiabatic irreversible expansion of an ideal gas against a constant external pressure $P_2,$ the P - V work is given by ?

The substitution reaction of optically active alkyl halides in which attack of nucleophile and detachment of halogen takes place in two different steps and racemic mixture is formed as product is:

What is the main principle of VSEPR theory?? What are it's postulates for ?? Please explain.

Thank you

For $PC{l}_5\left(g\right)\rightleftharpoons PC{l}_3\left(g\right)+C{l}_2\left(g\right),$ write the expression of $K_c.$

Calculate the work done when $2moles$ of hydrogen expand isothermally and reversibly at $25{}^{\circ }C$ from $15to45litres$.

The coagulation of 100 mL of gold sol is prevented by addition of 0.25 g of starch to it before adding 1 ml of 10% NaCl solution. If the gold number of starch is x then $\frac{x}{5}$ is: ___

The distinction between diethyl ketone and methyl ethyl ketone can be acheieved by using the reagent

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution. The compound is

[NCERT 1978; KCET 2000]

What is the gyro-magnetic ratio?

In a hydrogen oxygen fuel cell, electricity is produced. In this process $H_2\left(\text{g}\right)$ is oxidised at anode and $O_2\left(\text{g}\right)$ reduced at cathode. Given : Cathode: $O_2\left(g\right)+2H_{2}O\left(l\right)+4e^{-}\to 4O{H}^{-}\left(aq\right)$ Anode : $H_2\left(g\right)+2O{H}^{-}\left(aq\right)\to 2H_{2}O\left(l\right)+2e^{-}$ $4.48\text{L}$ of $H_2$ at $1\text{atm}$ and $273\text{K}$ is oxidised in $9650\text{sec}$.
If current produced in fuel cell, use for the deposition of $C{u}^{2+}$ in $1\text{L}$, $2\text{M}CuS{O}_4\left(\text{aq}\right)$ solution for $241.25\text{sec}$ using $Pt$ electrode. The $pH$ of solution after electrolysis is:

What is huckel's rule

Choose the correct order of reagents to be added for the following conversion:
$C_6{H}_5{\mathrm{CH}}_2\mathrm{Cl}\stackrel{\left(i\right)}{\to }{C}_6{H}_5{\mathrm{CH}}_2\mathrm{CN}\stackrel{\left(\mathrm{ii}\right)}{\to }{C}_6{H}_5{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2\underset{\Delta }{\overset{\left(\mathrm{iii}\right)}{\to }}{C}_6{H}_5{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{NC}$

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

What is the pH of the solution which is twice alkaline as that of pure water at ${25}^{\circ }C$ ?

The correct decreasing order of atomic size of the following species is:
$K^{+},C{l}^{-},S^{2-},C{a}^{2+}$

Which of the following orders is correct regarding the $-I$ effects of the substituents?

This method is used to purify liquids having very high boiling points and those, which decompose at or below their boiling points.

The temperature of a piece of iron is ${27}^0$ C and it is radiating energy at the rate of Q kWm-2. If its temperature is raised to ${151}^0$ C, the rate of radiation of energy will become approximately

Let the PE of hydrogen atom in the ground state be zero. Then its total energy in the first excite state will be

The function of AlCl₃ in the Friedel Crafts reaction is:

Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is -

4.0 g of a substance when dissolved in $36.0\text{g}$ of water lowered its vapour pressure by $0.5\text{mm Hg}$ at a given temperature. The vapour pressure of water at this temperature is $25.0\text{mm Hg}$. Calculate the molecular weight of solute.

Arrange the following compounds in order of decreasing acidity:

Physical properties of ice, water and steam are very different . What is the chemical composition of water in all the three states?

Chemical name of the insecticide gammexene is

Which of the following statements is incorrect?

EMF of cell $\left(E_{cell}^{\circ }\right)=$

Question 02

Which of the following options does not represent ground state electronic configuration of an atom ?

(a) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{8}4s^2$ (b) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{9}4s^2$ (c) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^1$ (d) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^1$

What does elementary entities means?