Chemistry Test ...

A monoelectronic species in energy level with energy X was provided with excess of energy so that it jumps to higher energy level with energy Y. If it can emit six wavelengths originated from all possible transition between these group levels, then which of the following relation is correct?

( ‘n’ is the principal quantum number of energy level X)

Consider the hypothetical reaction at equilibrium.

\(A(g)+3 B(s) \Leftrightarrow 2 C(g)+D(s),+\) Heat

In light of the Le-Chatelier's principle, and characteristics of equilibrium which of the following statements are correct.

Which of the following gas is evolved when ethanol reacts with sodium?

10 mL of 0.2 N HCl and 30 mL of 0.1 N HCl together exactly neutralizes 40 mL of solution of NaOH, which is also exactly neutralized by a solution in water of 0.61 g of an organic acid. The equivalent weight of the organic acid is

Which one of the following reactions will not result in the formation of carbon-carbon bond?

The nitration of aniline, which is predominantly an ortho-para director also forms a considerable quantity of meta-nitro aniline. How can we prevent this transition?

The compressibility factor for a real gas is expressed by \(z=1+\frac{B P}{R T}\) The value of \(\mathrm{B}\) at \(500 \mathrm{K}\) and 600 bar is \(0.0169 \mathrm{L} / \mathrm{mol}\). Molar volume of the gas at \(500 \mathrm{K}\) and \(600 \mathrm{bar}\) is- \((\) bar \(=1 \mathrm{atm})\)

\((\mathrm{R}=0.083 \mathrm{L}-\mathrm{atm} / \mathrm{mol}-\mathrm{K})\)

Which of the following substances exhibit tautomerism ?

For the water gas reaction \(C(s)+H_{2} O(g) \rightleftharpoons C O(g)+H_{2} O(g)\)

the standard Gibbs free energy of reaction \((a t 1000 K)\) is \(-8.1 k J /\) mol. Calculate its equilibrium constant.

Observe the following sequence of reactions and select the option(s) that is/are true in this context.

A crystalline substance composed of Ba, Ti and O crystallises in a perovskite structure. This structure may be described as a cubic lattice, with barium ion occupying corners of the unit cell and oxide ions occupying the face centres of the unit cell. Which of the following statements is/are true?

A dark violet colour mixture in presence of dil.HCl changes to pale yellow solution. Mixture may contain :

The equilibrium constant \(K_{p}\) for the reaction \(A(g) \rightleftharpoons B(g)+C(g)\)

is 1 at 27 . and 4 at 47 .

For the reaction calculate enthalpy change for the \(B(g)+C(g) \rightleftharpoons A(g)\)

(Given: \(R=2 c a l / m o l-K)\)

The thermal stability of alkaline earth metal carbonates \(\mathrm{MgCO}_{3}, \mathrm{CaCO}_{3}\) \(\mathrm{BaCO}_{3}\) and \(\mathrm{SrCO}_{3}\) decreases as