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Which of the following orbitals described by three quantum numbers will have different energies for a multielectron atom, in the absence of external electric and magnetic fields?
$\text{(1) n = 1, l = 0, m = 0}$
$\text{(2) n = 2, l = 1, m = -1}$
$\text{(3) n = 2, l = 1, m = +1}$
$\text{(4) n = 3, l = 2, m = +1}$
$\text{(5) n = 3, l = 2, m = 0}$

What will happen when D - (+) - glucose is treated with methanolic - HCl followed by Tollens' reagent ?

Ammonia gas is dried over:

Boron when heated with carbon forms

Match the species in Column I with the shape in Column II.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ i.& OS{F}_2& p.& \text{Tetrahedral}\\ ii.& O_{2}S{F}_2& q.& \text{Linear}\\ iii.& Xe{F}_4& r.& \text{Square planar}\\ iv.& Cl{O}_4^{-}& s.& \text{Trigonal pyramidal}\\ v.& I_3^{-}& t.& \text{See - saw}\end{array}$

Which of the following reactions will give tert-butyl benzene as the major product?

Given below a statement (S) and explanation (E) is given. Choose the appropriate answer:

Statement (S): $O_2$ is diamagnetic

Explanation (E): $O_2$ has two electrons in anti-bonding $\pi$ orbitals.

A certain mixed oxide of iron contains $2.5\text{g}$ of oxygen for every $7\text{g}$ of iron. If it is regarded as a mixture of $FeO$ and $F{e}_2{O}_3$ in the weight ratio $a:b$, what is $a:b$?
(atomic weight of iron = 56)

The empirical formula of an acid is CH₂O. 0.0835 moles of the compound contains 1g of hydrogen. Molecular formula of the compound is ___

If the number of atoms are changed in the lattice then ewil the number of voids change

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1 : 4 . The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture?

Is hydrogen a alkali metal or not?and why?

A non ideal solution is prepared by mixing 30mL chloroform and 50 mL of acetone. The volume of the mixture is.

A dispersion of AgCl in water is:

The bond order of Li₂ molecule is:

Rate of disappearance of the reactant A in the reversable and one step reaction $A\rightleftharpoons B$ at two temperatures is given by
$\frac{-d\left[A\right]}{dt}=2.0\times {10}^{-3}{s}^{-1}\left[A\right]-5.0\times {10}^{-4}{s}^{-1}\left[B\right]\left(at{27}^{\circ }C\right)\frac{-d\left[A\right]}{dt}=8.0\times {10}^{-2}{s}^{-1}\left[A\right]-4.0\times {10}^{-3}{s}^{-1}\left[B\right]\left(at{127}^{\circ }C\right)$
The enthapy of the reaction in the given temperature range is

Which of the following configurations of an element belongs to the 15${}^{th}$ group of the modern periodic table?

The best leaving group is :

Enthalpies of formation of $C{O}_{\left(g\right)},C{O}_{2\left(g\right)},N_2{O}_{\left(g\right)}$ and $N_2{O}_{4\left(g\right)}are–110kJmo{l}^{-1},–393kJmo{l}^{-1},81kJmo{l}^{–1}$ and $9.7kJmo{l}^{-1}$ respectively. Find the value of ${\Delta }_{r}H$ for the reaction:
$N_2{O}_{4\left(g\right)}+3C{O}_{\left(g\right)}\to N_2{O}_{\left(g\right)}+3C{O}_{2\left(g\right)}$

In the following reactions:
$Me-CH=CH-Me\underset{CC{l}_4}{\overset{B{r}_2}{\to }}A\stackrel{2NaN{H}_2}{\to }B\stackrel{Na/liqN{H}_3}{\to }C$ The product (c) is

Wavelength of photon having energy 2 $eV$:

A cubical vessel has a side with 'I' cm lenth contained a gas at a pressure of 'p'. when the side of the vessel is made $\frac{1}{2}$ cm, the pressure of gas becomes

What is denatured alcohol?

What is the order of Band gap in between substances given below. Silver, silicon, glass.

Which of the following is the energy of a possible excited state of hydrogen?

Rhombic sulphur has the following structure

Find the correct final product among the following options?

The dipole moment of H - Br molecule is $2.6\times {10}^{-30}$ coulomb.metre. Its bond length is $1.3\mathring{A}$ Then, the percentage ionic character of H - Br bond is:

The vapour pressure of a benzene – toluene binary solution at certain temperature is given by $P=450–100X_T$.
Where $X_T$ is the mole fraction of toluene. Find the vapour pressures of Benzene and Toluene in pure state.

The reaction of sodium ethoxide with iodoethane to form diethyl ether is termed as:

Among the following compounds the one that is paramagnetic is:

Show that relating lawing of vapour pressure of solution is equal to the mole fraction of solute

The differential coefficient of (log x)^tanx is:

Which of the following statements is correct, if the intermolecular force of attraction between the particles in liquid A, B, C is in the order A < B < C?

If ${\lambda }_0$ and $\lambda$ are the threshold wavelength and the wavelength of incident light respectively, the velocity of the photoelectrons ejected from the metal surface is:

Which of the following will be obtained by keeping ether in contact with air for a long time [RPMT 2003]

The reagent used for the separation of acetaldehyde from acetophenone is:

Consider the following sequence of reactions and give answer of the question.

C is:

In the sequence of reaction $A\stackrel{k_1}{⟶}B\stackrel{k_2}{⟶}C\stackrel{k_3}{⟶}D{k}_3>k_2>k_1$ then the rate determining step of the reaction

How fast is an electron moving if it has a wavelength equal to the distance it travels in one second?

Explain with two examples each of the following:
Coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.

O is the circumcentre of $\Delta$ ABC and $R_1,R_{2}and{R}_3$ are the radii of the circum circles of ${\Delta }^{les}$ OBC, OCA and OAB, respectively. Let a, b, and c be the sides of ${\Delta }^{le}$ ABC. The value of $a{R}_1^{-1}+b{R}_2^{-1}+c{R}_3^{-1}$ is