List of top Chemistry Questions

‘x’ be the osmotic pressure of a solution formed by dissolving 1g of a protein (M = 50,000 g/mol) in 0.5 litre and ‘y’ be the osmotic pressure of solution formed by dissolving 2g of the same protein in 1 litre at 300 K. If ‘z’ be the osmotic pressure of solution formed by mixing above two solutions. Then the value of ‘x’, ‘y’ and ‘z’ respectively are.
\text{Use: $ R = 0.083 \, \text{lit-bar/K-mol} $}

Molarity of $ H_2SO_4 (aq.) $ solution is 4.9 M. If the density of the solution is 1.40 g/mL, then molality and mole fraction of solute in the solution is:
(Molar mass of $ H_2SO_4 = 98 \, \text{g mol}^{-1} $)

Statement 1: The correct order of 2$^\text{nd}$ ionization energy for boron family elements is: $ \text{B}>\text{Al}>\text{Ga} $.
Statement 2: The correct order of 1$^\text{st}$ ionization energy for carbon family elements is: $ \text{Si}>\text{Ge}<\text{Pb}<\text{Sn} $.
Choose the correct option:

A cell is formed using the below half-cell reactions, and the cell is working with 80% efficiency. Work obtained is utilized for isothermal expansion of gas against external pressure of 1 kPa. Find $ \Delta V $ (in $ \text{m}^3 $). \[ \frac{1}{2} O_2 + 2H^+ + 2e^- \rightarrow H_2O; \, E^\circ = 1.23 \, \text{V} \] \[ 6H^+ + CO_2 + 6e^- \rightarrow CH_3OH + H_2O; \, E^\circ = 0.02 \, \text{V} \]

Statement I:

The carbocation in the structure $ \text{O}_2\text{N}\text{C} \text{H} $ is stabilized by the +R effect of the $ \text{-OCH}_3 $ group.
Statement II:

The carbocation in the structure $ \text{O}_2\text{N}\text{C} \text{H} $ is stabilized by the +R effect of the $ \text{-NO}_2 $ group.

For a reaction $ xA \rightarrow yB, \, k = 0.3 \, \text{M}^{-1} \text{sec}^{-1} $,
(i) If the concentration of A is made 4 times, then the rate of reaction becomes 16 times.
(ii) The decomposition of $ \text{N}_2\text{O}_5 $ is an example of this type of reaction.
(iii) The order of the reaction is 2.
(iv) A plot of $ \ln \left( \frac{[A]_0}{[A]_t} \right) $ vs. $ t $ is a straight line.
(v) The half-life of the reaction is independent of the concentration of the reactant.

Which of the following options has the correct set of statements:

Correct statement about product X and Y

$\text{(a) They can be differentiated by NaHCO}_3 \text{ test.} $
$\text{(b) They both gives 2,4-DNP test.} \\ \text{(c) They both have same molecular mass.} \\ \text{(d) They both react with same rate with HCN.} $

Arrange the following complexes in increasing order of C.F.S.E. ($ \Delta_0 $)
(a) $ [\text{Co}(\text{H}_2\text{O})_6]^{2+} $
(b) $ [\text{Co}(\text{H}_2\text{O})_6]^{3+} $
(c) $ [\text{Co}(\text{en})_3]^{3+} $

For first order reaction:
2A(g) → 4B(g) + C(g)
Total pressure at $ t = 30 \, \text{sec} $ and $ t = \infty $ are 300 torr and 600 torr respectively. Calculate pressure of C(g) at 30 sec (in torr).

Organic compound (X) + KOH $ \overset{H^+}{\rightarrow} $ gives product $ P $ having the same molar ratio of C : H : O. Identify product $ P $.

Which of the following compounds shows coordination isomerism?
(A) $ [\text{Fe(NH}_3)_6] [\text{Co(CN)}_6] $
(B) $ [\text{Cr(NH}_3)_6] [\text{Co(CN)}_6] $
(C) $ [\text{Co(NH}_3)_6] [\text{Co(CN)}_6] $
(D) $ [\text{Ag(NH}_3)_2] [\text{Ag(CN)}_2] $
(E) $ [\text{Fe(NH}_3)_6] [\text{Cr(CN)}_6] $

The correct set that contains all kinds of oxides (Basic, acidic, amphoteric, and neutral) is:

Which of the ions show positive Borax Bead test and has the largest ionization energy:

(A) is hydrocarbon

Match List I with List II.

Predict expression for $ \alpha $ in terms of $ K_{eq} $ and concentration
C: $ A_2B_3 \, (aq) \rightleftharpoons 2A^{3+} (aq) + 3B^{2-} (aq) $

Consider the following reaction sequence.

For the thermal decomposition of reactant AB(g), the following plot is constructed.

The half life of the reaction is 'x' min.
x =_______} min. (Nearest integer)}

From the following, the least stable structure is:
(Assume standard resonance structures)

Consider the following compounds. Arrange these compounds in a n increasing order of reactivity with nitrating mixture. The correct order is :

When $1$ g of compound $(X)$ is subjected to Kjeldahl's method for estimation of nitrogen, $15$ mL of $1$ M $\mathrm{H_2SO_4}$ was neutralized by ammonia evolved. The percentage of nitrogen in compound $(X)$ is:

Which of the following is most basic?

Consider the reaction given below:

$\text{A gives positive Fehling's test. Choose the correct relation}$.

Write the correct order of rate of reaction of following compounds with $PhN_2Cl$
P: $N,N$-dimethylaniline
Q: $N,N$-dimethyl-3-methylaniline
R: $N,N$-dimethyl-2,6-dimethylaniline

Identify (P)