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The number of nodal planes in a $p_x$ is

Not let's try this in 3-D. Calculate r and a relationship from the following figure.

If $a=x\ast r$, type x.

Dipole moment of which ketone is maximum?

An empty container was filled with equal masses of methane and hydrogen gases. The fraction of total pressure exerted by hydrogen is____.

The Tyndall effect is observed only when following conditions are satisfied:-

(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.

(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.

(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.

(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

The geometric form of crystals is the result of orderly arrangement of _____

The oxidation state of $Mo$ in its oxido-complex species $\left[M{o}_2{O}_4\right(C_2{H}_4{)}_2(H_{2}O{)}_2{]}^{2-}$ is:

KCl has higher melting point than AgCl. Why?

[$r_{A{g}^{+}}$ $\approx$ $r_{K^{+}}$]

Which of the following has the smallest size?

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

One of the following metals forms a volatile carbonyl compound and this property is taken advantage for its extraction. This metal is

The value of equilibrium constant for self ionisation of water at ${25}^{\circ }C$ is (density of water 1 $g/ml$) :

A sample of $2.5mol$ of hydrazine $\left(N_2{H}_4\right)$ loses $25mol$ of electrons on being converted to a new compound $X$. Assuming that there is no loss of nitrogen in the formation of the new compound and the oxidation state of $H^{+}$ is $+1$ throughout the reaction, then what is the oxidation number of nitrogen in compound $X$?

Structure of some important polymers is given. Which one represents Buna-S?

The potential of the cell at ${25}^{\circ }\text{C}$ is

$Pt|H_2\left(1\text{atm}\right)|C{H}_{3}COONa\left(0.1M\right)+C{H}_{3}COOH\left(0.01M\right)||N{H}_{4}Cl\left(0.2M\right)+N{H}_{4}OH\left(0.1M\right)|H_2\left(1\text{atm}\right)|Pt$

Given: $p{K}_a$ of $C{H}_{3}COOH$ and $p{K}_b$ of $N{H}_{4}OH=4.74$

pH of 0.5 M $Ba(CN{)}_2$ solution $(p{K}_{b}ofC{N}^{-}=9.30)$ is :

The electron belongs to the angular momentum of an $e^{-}$in a Bohr's orbit of H atom is $4.2178\times {10}^{-34}Kg.m^2.Se{c}^{-1}$.

From the options given below, choose the one that helps accomplish the given (above)conversion:

Proteins
are built up of

[CPMT 1981, 99; BHU 1987; CBSE PMT 2001;

MP PMT 1987, 96; KCET
1984]

Which of the following is not a basic amino
acid?

Van der Waals forces

The French physicist Louis de Broglie in 1924 postulated that matter, like radiation, should exhibit a dual behaviour. He proposed the following relationship between the wavelength lambda of a material particle, its linear momentum p and planck constant h.

$\lambda =\frac{h}{p}=\frac{h}{mv}$

The de Broglie relation implies that the wavelength of a particle should decrease as its velocity increases. It also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de Broglie waves. These waves differ from the electromagnetic waves as they

$\left(i\right)$ have lower velocities

$\left(ii\right)$ have no electrical and magnetic fields and

$\left(iii\right)$ are not emitted by the particle under consideration.

The experimental confirmation of the de Broglie’s relation was obtained when Davisson and Germer, in 1927, observed that a beam of electrons is diffracted by a nickel crystal. As diffraction is a characteristic property of waves, hence the beam of electron behaves as a wave, as proposed by de Broglie.



Using Bohr’s theory, the transition, so that the electron's de-Broglie wavelength becomes 3 times of its original value in $H{e}^{+}$ ion will be?

What is the geometry of $H_{2}S{O}_4$?

3.6 g of oxygen is adsorbed on 1.2 g of a metal powder. What volume of oxygen is adsorbed per gram of the adsorbent at 1 atm and 300 K?

Which of the following structure is more stable?

The correct order of acid strength is:

Which of the following cyclic dienes does not show geometrical isomerism?

The solubility of Iodine in pure water is less than its solubility in potassium iodide solution, because

The heat of formation of $C_2{H}_{5}OH\left(l\right)$ is $-66kcalmo{l}^{-1}$. The heat of combustion of $C{H}_{3}OC{H}_3\left(g\right)$ is $-348kcalmo{l}^{-1}$. $△H_f$ for $H_{2}O$ and $C{O}_2$ are $-68kcalmo{l}^{-1}$ and $-94kcalmo{l}^{-1}$ respectively.

Then, the $△H$ for reaction $C_2{H}_{5}OH\left(l\right)\to C{H}_{3}OC{H}_3\left(g\right)$ is :

Which of the following is not an example of green chemistry?

Which compound is formed when CH₃OH reacts with CH₃-Mg-X[CPMT 1977, 89]

In the manufacture of sodium carbonate, the following reactions are involved:

$\text{(A)}\stackrel{\Delta }{\to }\text{(B)}+{\text{CO}}_2$

$\text{(B)}+{\text{H}}_2\text{O}\to \text{(C)}\stackrel{N{H}_{4}Cl}{\to }\text{(D)}$

$\text{(E)}+{\text{CO}}_2\to \text{(F)}$

$\text{(F)}+\text{NaCl}\to \text{G}\stackrel{Heat}{\to }{\text{Na}}_2{\text{CO}}_3+{\text{CO}}_2+{\text{H}}_2\text{O}$

${\text{(D) is a gas which is soluble in H}}_2\text{O}$



Compound (A) is:

Which of the following produces Benzene as a byproduct?

The molar solubility in $\left(mol{L}^{-1}\right)$ of a sparingly soluble salt $M{X}_4$​ is ${}^{\prime }{s}^{\prime }$.The molar solubility product is $K_{sp}$. ${}^{\prime }{s}^{\prime }$ is given in terms of $K_{sp}$ by the relation:

An element $X$ has the following isotopic composition: ${}^{200}\text{X}-90\%,{}^{199}\text{X}-8\%,{}^{202}\text{X}-2\%$. The weighted average atomic mass of the naturally occurring element $X$ is closest to:

In a fuel cell, $H_2$ and $O_2$ react to produce electricity. In the process, $H_2$ gas is oxidized at the anode and $O_2$ gas is reduced at the cathode. If $67.2\text{litres}$ of $H_2$ at $STP$ react in 15 minutes and the entire current is used for electrode deposition of $Cu$ from $Cu\left(II\right)$ solution, how many grams of $Cu$ will be deposited and what is the average current produced?

Anode : $H_2+2O{H}^{-}\to 2H_{2}O+2e^{-}$

Cathode : $O_2+2H_{2}O+4e^{-}\to 4O{H}^{-}$

The detergent used in hair conditioner is

A $100W$ power source emits green light having a wavelength of $5000\stackrel{\circ }{A}$. How many photons are emitted per minute by the source?

LiCl is hydrated while NaCl is not. Why?

Which of the following complex compounds will not exhibit geometrical isomerism?

Gravity separation is also called __

Read the following question and answer as per the direction given below:

Statement 1: In any ionic solid [MX] with Schottky defect, the number of positive and negative ions are same.

Statement 2: An equal number of cation and anion vacancies is present.

The impurities present in mined ore are technically called

The enthalpy of vaporisation of liquid diethyl ether is $26.0kJmo{l}^{-1}$ at its boiling point ${35.0}^{o}C.$

Calculate $△S$ for conversion of vapour to liquid at ${35.0}^{o}C$ in $J{K}^{-1}mo{l}^{-1}$.