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The number of atoms present in one mole of an element is equal to Avogadro's number. Which of the following element contains the greatest number of atoms?

(a) 4 g He

(b) 46 g Na

(c) 0.40 g Ca

(d) 12 g He

For a general reaction $A\to B$, the plot of concentration of A vs time is given in the figure. Answer the following questions on the basis of this graph. (i) What is the order of the reaction? (ii) What is the slope of the curve? (iii) What are the units of rate constant?

Observe the given figure

Which is the following is the correct representation of the triangular sum of the fifth square in the sequence?

Thermodynamics is not concerned about
(a) energy changes involved in a chemical reaction
(b) the extent to which a chemical reaction proceeds
(c) the rate at which a reaction proceeds
(d) the feasibility of a chemical reaction

The ionization constant of acetic acid is $1.74\times {10}^{-5}$. Calculate the degree of dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.

Which of the following are not used as food preservatives?
(a) Table salt
(b) Sodium hydrogencarbonate
(c) Cane sugar
(d) Benzoic acid

Which of the choices below is not a factor that promotes oxygen binding to and dissociation from haemoglobin?

The pair of orbitals which can not involve in bond formation (if Y-axis is the inter-nuclear axis) is:

Which one of the following pairs are called position isomers

$F{e}^{+2}+2e^{-}\to Fe....\left(i\right)$

$F{e}^{+3}+e^{-}\to F{e}^{+2}.......\left(ii\right)$

The standard potential corresponding to reaction (i) and (ii) are $E_1$ and $E_2$. The value of standard potential corresponding to the reaction $F{e}^{+3}+3e^{-}\to Fe$ is $\frac{x{E}_1+y{E}_2}{z}$, then the value of x+y+z is ___

$B{r}_2$ solution is not decolourised by

The systematic-IUPAC name of the following compound is?

Which of the following oxides is amphoteric in character

Assertion (A): Sodium metal is stored in kerosene

Reason (R): The density of sodium is less than water

Why is free radical substitution generally not suitable for laboratory preparation of haloalkanes?

There are four salts of the type $MX$, $M{X}_2$, $M{X}_3$ and $M{X}_4$ and all have the same value of $K_{sp}$: $1.0\times {10}^{-6}$. The salt that has maximum solubility.

Which of the following is a tautomer of

$C{H}_3-\underset{\stackrel{||}{O}}{C}-H$?

Base catalysed aldol-condensation occurs with:

The correct statements regarding the acids are
A) $N{H}_3$ can act as both bronsted base as well as Lewis base
B) Dry hydrogen chloride is not Arrhenius acid

C) According to Davy, acid must contain oxygen as necessary element

Find out the internal energy change for the reaction $A\left(l\right)\to A\left(g\right)$ at $373K$. Heat of vaporisation is $40.66kJ/mol$ and $R=8.3Jmo{l}^{-1}{K}^{-1}$.

The chief consumer (sink) for $C\stackrel{.}{l}$ and $C\stackrel{.}{l}O$ which cause ozone deplection is

Identify the compound that exhibits tautomerism:

The solubility product of AgCl in water is ${10}^{-10}mo{l}^2{L}^{-2}$. The solubility of AgCl in ${10}^{-1}N$ solution of KCl at ${25}^{\circ }C$ is approximately (in mol $L^{-1}$)

Which of the following property progressively increases down a group in the modern periodic table?

Glycerol has strong intermolecular bonding therefore it is

An atomic orbital has a total of 4 nodes in which two are radial nodes. The orbital is:

Compounds I and II may be grouped as

In this question, an Assertion (A) is followed by a corresponding Reason (R). Choose the appropriate option.

Assertion (A): In $CsCl$ crystal, the coordination number of $C{s}^{\oplus }$ ion is 8.

Reason (R): $C{l}^{\ominus }$ ions in $CsCl$ adopt bcc type of packing.

The decomposition of hydrogen peroxide can be slowed by the addition of a small amount of acetamide. The latter acts as a

The standard reduction electrode potentials of four elements are

A=-0.250 V B=-0.136 V

C=-0.126 D=-0.402 V

The element that displaces A from its compounds is

Assertion (A): Sulphanilic acid exists as dipolar ion where as p - amino benzoic acid does not

Reason (R): Carboxy group being more acidic than - SO₃H group can easily transfer a H⁺ to the amino group

Correct statements regarding 'D' is

When CH₂ = CH - COOH is reduced with LiAlH₄ , the compound formed is

The reaction

can be classified as

Which of the following reagents would distinguish cis-cyclopenta -1, 2- diol from the trans-isomer?

Synthetic gas is a mixture of

What is the product of the following reaction?
$\text{Hex-3-ynal}\underset{\text{(iii)}Mg/\text{ether}\text{(iv)}C{O}_2/H_3{O}^{+}}{\overset{\text{(i)}NaB{H}_4\text{(ii)}PB{r}_3}{\to }}$

Assertion (A) p-nitrophenol is more acidic than phenol.
Reason (R) Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

The shape and geometry of $Xe{F}_2$ in vapor phase are respectively:

Among the following metal carbonyls, the C-O bond order is lowest in: