List of top Questions asked in AP EAPCET

A solid solute is dissolved in water. The mole fraction of solute is 0.02. What is the molality of the solution?

A and B are two position isomers of an alkene $C_5H_{10}$. Both A and B do not exhibit cis-trans isomerism. Addition of HBr with A forms X (major product) and B adds HBr to form Y (major product). What are X and Y respectively?

Observe the following reaction: $2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)$. At T(K), the concentration of $N_2O_5(g)$ changed from 2 mol $L^{-1}$ to 1.5 mol $L^{-1}$ in 100 min. What is the average rate (in mol $L^{-1} min^{-1}$) of this reaction?

Metals A and B crystallize in "simple cubic" and "face centered cubic" lattice respectively. The number of metal atoms A and B per unit cell are respectively:

The following reaction takes place in a cell at 298 K: $2M^{3+}(aq) + 2I^{-}(aq) \rightarrow 2M^{2+}(aq) + I_2(s)$. What is the value of $\log K_c$ for this reaction? (Given: $E_{cell}^\circ = 0.235 V, F = 96500 C mol^{-1}, R = 8.3 J mol^{-1} K^{-1}$)

What are X and Y in the following reaction sequence? $Ethanal \rightarrow C_4H_8 \xrightarrow{Br_2/CCl_4} X \xrightarrow{alc. KOH, NaNH_2} Y$

Which of the following orders are not correct regarding first ionisation enthalpy of the given elements (I: B>Al, II: Al>Ga, III: Ga>In, IV: In>Tl)?

Identify the pairs in which chemical substance is correctly matched with its use: (I) Liquid $CO_2$ - As solvent in dry cleaning, (II) $NaClO_3$ - herbicide, (III) $H_2O_2$ - bleaching agent.

Statement I: The groups $NHCOCH_3$ and $-OCOCH_3$ deactivate the benzene ring for electrophilic attack. Statement II: -OH and $-CH_2CH_3$ groups activate the benzene ring for electrophilic attack.

Which of the following is not correctly matched with respect to the nature of oxides?

1 mL of 30 % (w/V) $H_2O_2$ solution at STP gives 100 mL of oxygen gas. The volume strength of $H_2O_2$ (in V) is:

Identify the incorrect statement from the following:

In a tube, a liquid is flowing as shown in the diagram. The correct order of the velocity (u) of liquid flowing in this tube is: figure [H]

figure

What is $\Delta_r H^\ominus$ (in kJ mol$^{-1}$) for the following reaction at 298 K? $C_3H_8(g) + 5O_2(g) \rightarrow 3CO_2(g) + 4H_2O(l)$ (Given: $\Delta_f H^\ominus$ of $C_3H_8(g)$, $CO_2(g)$ and $H_2O(l)$ is -104, -393 and -285 kJ mol$^{-1}$ respectively)

Consider the following reaction: $A(g) + B(g) \rightleftharpoons C(g) + D(g)$. Which one of the following is zero for this reaction at 298 K?

The pH of a 0.1 M solution of a weak monobasic organic acid is 4.0. What is the dissociation constant of the acid?

At T(K) the $K_c$ for the reactions (I) and (II) are $2.4 \times 10^{30}$ and 1.4 respectively. What is the $K_c$ value for: $\frac{1}{2}N_2(g) + \frac{1}{2}O_2(g) + \frac{1}{2}Br_2(g) \rightleftharpoons NOBr(g)$?

One mole of $O_2$ (g) was passed over hot coke. At the end of the reaction, 40 % of $O_2$ (g) was unreacted. What is the volume (in L) of reaction mixture at STP (273.15 K and 1 bar)? (Assume only CO (g) is formed in the reaction)

The difference between the radii of M and N shells of $He^+$ is $\Delta R_1$(nm). The difference between the radii of L and N shells of $Li^{2+}$ is $\Delta R_2$(nm). The ratio of $\Delta R_1$ to $\Delta R_2$ is:

In how many of the above molecules ($PF_5, H_2O, NH_3, XeF_2, BF_3, SF_6, IF_7$), the ratio between the number of bond pairs of electrons and lone pairs of electrons is 1:3?

The number of Pi ($\pi$) bonds in $C_2H_4, C_2H_2$ and $C_2N_2$ is x, y and z respectively. The sum of x, y and z is equal to:

Identify the pairs of elements, which possess almost the same size as well as properties

If the velocity of an electron in the first Bohr's orbit of H-atom is x $ms^{-1}$, then the velocity (in $ms^{-1}$) of an electron in the fourth Bohr's orbit of the same atom is:

Over modulation occurs when modulation index 'm' is:

For the circuit given below, which of the following is correct option?