List of top Chemistry Questions asked in AP EAPCET

Observe the following reaction \[ A(g) + B(g) \rightleftharpoons C(g) + D(g) \] In a \(1\,L\) closed flask, \(2\) moles of \(A(g)\) and \(1\) mole of \(B(g)\) were taken and heated to temperature \(T(K)\). At equilibrium, the concentration of \(C(g)\) is thrice the concentration of \(B(g)\). What is the value of \(K_c\)?

The dissociation constants of \(H_2A\) are \[ K_{a1}=6\times10^{-2} \quad \text{and} \quad K_{a2}=6\times10^{-5} \] respectively. At equilibrium, \[ [A^{2-}] = [H_2A] \] What is the approximate concentration of \(H^+\) at equilibrium?

The interstitial hydrides of which set of metals have same lattice as that of the parent metals?

Match the following \[ \begin{array}{|c|c|} \hline \text{List-I} & \text{List-II} \\ \hline \text{A. Co, Ni} & \text{I. Electronegativity} \\ \text{B. K, Ba} & \text{II. Electron gain enthalpy} \\ \text{C. N, Cl} & \text{III. Metallic radius} \\ \text{D. Ar, Kr} & \text{IV. Standard reduction potential (-ve)} \\ \hline \end{array} \] The correct answer is

Combustion of methane gives \(CO_2(g)\) and \(H_2O(l)\). What is enthalpy of combustion \((\Delta_c H^\circ \text{ in kJ mol}^{-1})\) of \(CH_4(g)\) at \(298\,K\)?
\[ (\Delta_f H^\circ(CH_4(g)) = -x\,\text{kJ mol}^{-1},\; \Delta_f H^\circ(CO_2(g)) = -y\,\text{kJ mol}^{-1},\; \Delta_f H^\circ(H_2O(l)) = -z\,\text{kJ mol}^{-1}) \]

5.4 g of a metal (M) reacts with chlorine to form \(26.7\,\text{g}\) of metal chloride. What is the weight (in g) of M that reacts with \(48\,\text{g}\) of oxygen?

Following is the structural representation of \(N_2O_3\) molecule in which \(x, y, z\) are bond angles and \(p, q, r\) are bond lengths. The correct orders of bond angles and bond lengths respectively are center

center

At \(T(K)\), the rms velocity of an ideal gas is \(x\,\text{m s}^{-1}\). At what temperature (in K), the rms velocity becomes \(3x\,\text{m s}^{-1}\)?

How many of the following molecules are linear with no lone pairs of electrons on the central atom?
\[ \text{BeCl}_2,\ \text{O}_3,\ \text{SCl}_2,\ \text{XeF}_2,\ \text{SnCl}_2,\ \text{PbCl}_2,\ \text{HgCl}_2 \]

Which of the following has lowest $pK_a$?

Identify the major product 'P' in the following sequence of reactions: $... \xrightarrow{O_3, Zn/H_2O} \xrightarrow{dil NaOH} P$.

Identify the compounds which can react with chloroform and alcoholic KOH and give substances with offensive odour (Carbylamine test).

In which of the following sets, given species are not only diamagnetic in nature but also inner orbital complexes?

Observe the following polymerization reactions I and II: I. $A+B \rightarrow X$ (polymer), II. $C+D \rightarrow Y$ (polymer). In reaction I, monomer (A) reacts with NaOH, and in reaction II, monomer (C) reacts with $NaHCO_3$. What are X and Y respectively?

Which of the following is not an example of an antibiotic?

Identify the chiral molecules from the following.

Which of the following is/are present both in DNA and RNA? figure [H]

figure

What is the end product Z in the given reaction sequence? $Phenol \xrightarrow[Zn/\Delta]{(i)} X \xrightarrow[Cl_2/FeCl_3, \Delta]{(ii)} Y \xrightarrow{CH_3COCl/Anh. AlCl_3} Z \xrightarrow[Glycol, \Delta]{N_2H_4/OH^-} Z?$

The ground state electronic configuration of Gadolinium (Z=64) is:

Chlorine reacts separately with cold, dilute NaOH and hot, concentrated NaOH. Which of the following statements regarding these reactions is not correct?

White phosphorus reacts with sulphuryl chloride and forms a solid substance A and a gas D. When A is heated at high temperature, it decomposes to give a colorless oily liquid 'X' and a gas C. The shape of X is:

Match the following:
figure [H]

figure

The following graph is obtained for the adsorption of a gas on a metal surface at 300K. What is the value of $x/m$ when the pressure of gas is 2 bar?