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In the scheme given below, the total number of intramolecular aldol condensation products formed from Y is ___

The enthalpy of vaporization of water at ${100}^{\circ }\text{C}$ is $40.63{\text{kJ mol}}^{-1}$. Its entropy of vaporization would be:

A 100 Watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

Hund's Rule states that:

The osmotic pressure at ${17}^{\circ }C$ of an aqeuous solution containing $1.75g$ of sucrose per $150mL$ solution is

The order of reactivity of following compounds towards sodalime decarboxylation reaction is:

The root word used for 8 carbons in parent chain is

Which of the following electronic configuration does not follow Aufbau's Principle?

Let the energy, magnitude of linear momentum and angular frequency of an electron in hydrogen atom be E, P and $\omega$ respectively. If n be the corresponding quantum number, then

$\begin{array}{ccccc}Cities& Shimla& Bangalore& Delhi& Mumbai\\ pinN/m^2& 1.01\times {10}^5& 1.2\times {10}^5& 1.02\times {10}^5& 1.21\times {10}^5\end{array}$

Consider the above data and mark the place at which liquid will boil first.

(a) Shimla (b) Bangalore (c) Delhi (d) Mumbai

[Orissa JEE 2003]

Which of the following relation is correct regarding $pH$ of salt of amphiprotic ion, $H_{2}P{O}_4^{-}$:
Given: $K_{a_1}$ is first acid dissociation constant of $H_{3}P{O}_4$ and $K_{a_2}$ is second acid dissociation constant of $H_{3}P{O}_4$.

If the position of the electron is measured within an accuracy of + 0.002 nm, calculate the uncertainty in the momentum of the electron. Suppose the momentum of the electron is h/4πm × 0.05 nm, is there any problem in defining this value.

Predict the structure of ‘B’ in the given reaction:

If the kinetic energy of the particle is increased to $16$ times its previous value. The percentage change in the de-Broglie wavelength of the particle is

Consider the following reaction between zinc and oxygen and choose the correct options out of the options given below
$2Zn\left(s\right)+O_2\left(g\right)\to 2ZnO\left(s\right);\Delta H=-693.8kJmo{l}^{-1}$
(a) The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
(b) The enthalpy of two moles of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
(c) 693.8 kJ $mo{l}^{-1}$ energy is evolved in the reaction
(d) 693.8 kJ $mo{l}^{-1}$ energy is absorbed in the reaction

Correct statement about the given chemical reaction is:

1. The reaction is possible and compound (A) will be a major product.

2. The reaction will form a sulfonated product instead of nitration.

3. The ${\mathrm{NH}}_2$ group is ortho and para directive, so product (B) is not possible.

4. The reaction is possible and compound (B) will be the major product.

Draw
diagrams showing the formation of a double bond and a triple bond
between carbon atoms in C₂H₄
and C₂H₂
molecules.

In a solid AB having the NaCl structure, A atom occupies the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is:

For the reaction, $H_2\left(g\right)+I_2\left(g\right)\iff$ 2HI(g)\), the equilibrium constant Kp changes when

The most stable enolic form of 2,4-pentanedione