List of top Chemistry Questions

Choose the incorrect statement from the following:

In which of the following intramolecular H-bonding is absent?
Options:
- Salicylic acid
- Salicylaldehyde
- Quinol
- Catechol

Among $ \text{B}_2\text{O}_3 $, $ \text{Al}_2\text{O}_3 $, and $ \text{In}_2\text{O}_3 $, the oxides which react with alkalies are:

The radius of fourth orbit in $ He^+ $ ion is $ R_1 $ pm and radius of third orbit in $ Li^{2+} $ ion is $ R_2 $ pm. The value of $ (R_1 - R_2) $ in pm is:

The synthetic detergents of the following are

For a first-order reaction, the rate constant $ k $ is $ 1.386 \times 10^{-3} \, \text{s}^{-1} $. What is the half-life $ t_{1/2} $ of the reaction? (Use $ \ln 2 = 0.693 $)

Consider the following
Statement-I: Kolbe's electrolysis of sodium propionate gives n-hexane as product.
Statement-II: In Kolbe's process, CO$_2$ is liberated at anode and H$_2$ is liberated at cathode.

Which of the following sets are correctly matched?
I) Hg — distillation
II) Cu — poling
III) B — zone refining
IV) Ti — liquation

How many molecules are present in 4.4 grams of CO$_2$?
(Molar mass of CO$_2$ = 44 g/mol, Avogadro's number = $6.022 \times 10^{23}$)

Observe the following given changes: \[ \text{wood} \xrightarrow[\text{absence of air}]{\text{high temperature}} X
\text{coal} \xrightarrow[\text{absence of air}]{\text{high temperature}} Y \] X and Y respectively are:

For the following given equilibrium reaction, K$_p$ is equal to 1076 at T(K). What is the value of T (in K)? \[ \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) \] Given that $ R = 0.082 \, \text{L atm K}^{-1} \text{mol}^{-1} $, $ K_p = 1076 $, the equation is: \[ K_p = 1076, \, R = 0.082 \, \text{L atm K}^{-1} \text{mol}^{-1} \]

Consider the following:
Statement-I: Both BeSO$_4$ and MgSO$_4$ are readily soluble in water.
Statement-II: Among the nitrates of alkaline earth metals, only Be(NO$_3$)$_2$ on strong heating gives its oxide, NO$_2$, and O$_2$.
The correct answer is

The standard reduction potentials are: $ E^\circ_{\text{Ag}^+/\text{Ag}} = +0.80\, \text{V} $ and $ E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34\, \text{V} $. What will happen when a copper rod is placed in a solution of silver nitrate?

a, b, c, d are electromagnetic radiations. Frequencies of a, b, c are $3 \times 10^{15$ Hz, respectively, whereas the wavelength of c, d are 400 nm, 750 nm, respectively. The increasing order of their energies is}

At 700 K, the equilibrium constant $K_e$ for the reaction $ \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) $ is 0.2 mol L$^{-2}$. What is the value of $K$ for the reverse reaction?

Which one of the following gases is the major contributor to global warming?

Match the following polymers with their applications: