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In Metallurgy, which of the following terms are popular methods of concentration?

Which metal exhibits more than one oxidation states in their compounds.

Let $y=y\left(x\right)$ be the solution of the differential equation, $(x^2+1{)}^2\frac{dy}{dx}+2x(x^2+1)y=1$ such that $y\left(0\right)=0$. If $\sqrt{a}y\left(1\right)=\frac{\pi }{32}$, then the value of $a$ is:

If the solubility of $Ca{F}_2$ in water at ${18}^{\circ }C$ is $2.05\times {10}^{-4}mol{L}^{-1}$. Calculate its solubility product at the given temperature.

n-Propyl bromide reacts with ethanolic KOH to form:

Which of the following crystals can exhibit
paramagnetic property

Arrange the following alcohols in order of increasing ease of dehydration

$C{H}_{3}C{H}_{2}OH$ $C_6{H}_{5}C{H}_{2}OH$

I II



$C{l}_{3}CC{H}_{2}OH$ $F_{3}CC{H}_{2}OH$

​ III IV

Methyl alcohol is toxic. The reason assigned is [RPET 2000]

Which of the following species have S-S bonds?

Which has most stable +2 oxidation state?

An aromatic amine (A) was treated with alcoholic potash and another compound (Y) when foul smelling gas

was formed with formula C₆H₅NC. Y was formed by reacting a compound (Z) with Cl₂ in the presence of

slaked lime. The compound (Z) is [CBSE PMT 1990]

Consider two sparingly soluble salts $AB$ and $AC$.

If $AB$ has solubility as $xmol{L}^{-1}$ in presence of $AC$ , and $AC$ has solubility as $ymol{L}^{-1}$ in presence of $AB$.

Which of the following relations are correct?

One or both the ions of a salt react with water to produce acidic, basic or neutral solution. This process is called:

The depression in freezing point of a 0.1M solution of a solute that exists as a dimer is 'E'. The depression in freezing point of 0.1M NaCl solution in terms of 'E' is

Benzenediazonium chloride when treated with phenols gives azo dyes, to get best result the pH of the medium should be

The reaction $(C{H}_3{)}_{3}C$-Br+ water -------$>$ t-Butyl alcohol is:

Which of the following is the $\alpha$ -carbon in

Which is the incorrect statement?

Benezene reacts with $C{H}_{3}COCl$ in the presence of $AlC{l}_3$ to give

The constant '$a$' in van der Waals' equation is maximum in:

Arrange F, Cl, O, and N in the decreasing order of electronegativity.

In the following sequence, product I, J, and L are formed. K represents a reagent.

Which of the following structures/reagents are appropriate for J or K?

Which one of the following can be used as monomer in a polymerisation reaction?



[MP PMT 1993]

For which of the following compounds a valid Lewis structure cannot be drawn without violating the octet rule?

Three gases $A,B$ and $C$ are at same temperature if their rms speed are in the ratio $1:\frac{1}{\sqrt{2}}:\frac{1}{\sqrt{3}}$ then their molar masses will be in the ratio:

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $△U$ and W correspond to

What will be the order of $I^{st}$ ionisation energy?

Which one of the following is not a condensation polymer ?

Amorphous
substances show

(A) Short and
long range or

(B)Short range ord

(C)Long range order

(D)Have
no sharp M.P

A decomposes under different environment separately to form B and C according to reactions:

$A\to 3B\dots \text{(i)}$

$A\to 2C\dots \text{(ii)}$

The yield of reaction (i) and (ii) is found to be 60% and 40% respectively and amount of B and C is found to be $20\text{g}$ and $15\text{g}$ respectively. Calculate the total amount of A which were taken initially.

(Molar mass of $A=30\text{g/mol}$)

An atomic orbital has a total of 5 nodes in which two are radial nodes. The orbital is:

Which of the following compounds would not give ppt. with $AgN{O}_3$

Conductance of 0.1 M KCl (conductivity = x $oh{m}^{-1}c{m}^{-1}$)

filled in a conductivity cell is y $oh{m}^{-1}$. If the conductance of 0.1 M NaOH filled in the same cell is z $oh{m}^{-1}$, molar conductance of NaOH will be :

Accumulation of lactic acid $\left(H{C}_3{H}_5{O}_3\right),$ a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, $K_a,$ for this acid will be

Chronic chloroform exposure may cause damage to the liver and kidney, due to the formation of:

Which of the following represents the correct structure of compound with IUPAC name 3,6-diisopropyl-2,6-dimethylnonane?

The entropy change involved in the conversion of 1 mole of liquid water at $373K$ to vapour will be:

Given: $△H_{vap}=2.257kJ/g$

The rate constant of the reaction $A\to B$ is $0.6\times {10}^{-3}\text{M/s}$. If the concentration of $A$ is $5\text{M}$, then concentration of $B$ after 20 minutes is :-

Glycerol is used in the manufacture of [SCRA 1991]

Which of the following is phenolic [J & K 2005]

What is the value of Electron gain enthalpy of $N{a}^{+}$, if $I{E}_1$ of $Na=5.1eV$ .

The structure of a mixed oxide is cubic close packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One-fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

A weak acid $HA$ after treating with $12\text{mL}$ of $0.1M$ strong base $BOH$ has a $pH$ of 5. At the end point the volume of same base required is $26.6\text{mL}$. Calculate the $K_a$ of an acid.

A hydrogen electrode placed in a solution containing sodium acetate and acetic acid in the concentration ratios of $x:y$ and $y:x$ has electrode potential values $E_1$ and $E_2$ volts, respectively, at ${25}^{\circ }\text{C}$. The $p{K}_a$ value of acetic acid is:

Arrange the following compounds in order of decreasing acidity: