List of top Chemistry Questions asked in AP EAPCET

If the energy required to remove an electron from the ground state of \(He^+\) is \(x\) J, the energy (in J) required to remove an electron from the ground state of \(Li^{2+}\) is:

The threshold frequency of a metal is \(1.15 \times 10^{15}\) Hz. If electrons with kinetic energy of \(0.20\) eV are ejected when this metal surface is irradiated with photons of frequency '\(\nu\)', the value of \(\nu\) is (\(h=6.60 \times 10^{-34}\) Js, \(1\) eV \(=1.6 \times 10^{-19}\) J)

Consider the reactions: Y \(\xrightarrow{i.\ LiAlH_4,\ ii.\ H_2O}\) X; \(CONH_2 \xrightarrow{Br_2/OH^-}\) X. Statements: I. \(pK_b\) of X \(>\) Y; II. Both form stable diazonium salts with \(NaNO_2/HCl\); III. Both prepared by ammonolysis.

Benzonitrile (A) + X \(\rightarrow\) B; A + Y \(\rightarrow\) C. B + C \(\xrightarrow{dil.\ NaOH}\) \(\alpha,\beta\)-unsaturated carbonyl compound. What are X and Y?

What are X and Y respectively in the following set of reactions? (R--Br + \(CH_{3}CH_{2}O^-\) \(\rightarrow\) X; R--Br + \((CH_{3})_{3}CO^-\) \(\rightarrow\) Y)

Which of the following represents the structure of 'Terpineol'?

Alkyl halide A (\(C_4H_9Br\)) + NaOH \(\rightarrow\) alcohol (B). Alcohol B + reagent C \(\rightarrow\) carboxylic acid D. What are C and D?

Ethanal \(\xrightarrow{i. (CH_3)_2CHMgBr,\ ii.\ H_2O}\) X;
Propanone \(\xrightarrow{i.\ C_2H_5MgBr,\ ii.\ H_2O}\) Y.
Consider statements: I. Ease of dehydration \(Y>X\); II. Acidic character \(X>Y\); III. Reactivity towards Lucas reagent \(X>Y\). I. Ease of dehydration is Y > X
II. Acidic character is X > Y
III. Reactivity towards Lucas reagent is X > Y

Which of the following four compounds (I to IV) are correctly arranged in decreasing order of reactivity towards \(S_{N}2\) reaction?
I. 1-Bromobutane
II. 1-Bromo-2-methylbutane
III. 1-Bromo-2,2-dimethylpropane
IV. 1-Bromo-3-methylbutane

In which of the following given sets, complexes are correctly arranged in the increasing order of their spin only magnetic moment values? align* I. & [Fe(CN)_6]^4- < [Fe(CN)_6]^3- < [Fe(H_2O)_6]^3+
II. & [Co(NH_3)_6]^3+ < [Ni(H_2O)_6]^2+ < [Cr(H_2O)_6]^3+
III. & [V(H_2O)_6]^3+ < [Cr(CN)_6]^3- < [Fe(H_2O)_6]^2+ align*

Which of the following is not an example of copolymer?

Which of the following are the correct statements about D-glucose? flalign* I. & It forms oxime with hydroxyl amine &
II. & It forms addition product with NaHSO_3 &
III. & It forms cyanohydrin with HCN &
IV. & It forms saccharic acid with bromine water & flalign*

Chlorine gas reacts with cold, dilute NaOH to produce NaCl, H\(_2\)O and (X). With hot, concentrated NaOH, it produces NaCl, H\(_2\)O and (Y). Identify the correct statements regarding the oxidation states of chlorine in X and Y.

• The oxidation state of chlorine in Y is same as that of nitrogen in nitric acid

• The oxidation state of chlorine in X is same as that of phosphorus in phosphinic acid

• The sum of the oxidation states of chlorine in X and Y is same as that of iodine in iodic acid

The nature of chromium oxide formed by the thermal decomposition of ammonium dichromate is

The method by which very pure nitrogen can be obtained is

The number of moles of \(H_{2}\) gas liberated at cathode, when 10 mA current is passed through dilute NaCl for \(19.3 \times 10^{4}\) seconds is (\(F=96500 C mol^{-1}\))

Which of the following is most effective towards coagulation of CdS sol?

If a graph is drawn between \(log(x/m)\) (y-axis) and log p (x-axis) we get a straight line with slope equal to 2 and intercept equal to 0.60. The value of x/m at 9 atm is (\(log 4=0.60\))

The value of \(log K_{c}\) for the given cell reaction at 298 K is
\(Cu(s)+2Ag^{+}(aq)\rightarrow Cu^{2+}(aq)+2Ag(s)\).
(Given: \(E^{\circ}_{Cu^{2+}/Cu}=0.34V, E^{\circ}_{Ag^{+}/Ag}=0.80V; \frac{2.303RT}{F}=0.06\))

Wrought iron is prepared from cast iron in a reverberatory furnace. The substance commonly used to line the furnace and the chemical process involved in it are respectively

When 50 mL of 2M \(N_{2}O_{5}\) was heated, 0.28 L of \(O_{2}\) was formed at STP after 30 minutes. The concentration of unreacted \(N_{2}O_{5}\) is X M and average rate is Y. What are X and Y?

Which ions in drinking water causes a disease 'methemoglobinemia' when they are above permissible level?

Consider the following carbocations and the correct stability order for the above carbocations is

Which of the following reaction is not correct?

In the estimation of sulphur by Carius method. x g of an organic compound gave 0.233 g of \(BaSO_{4}\) If the percentage of sulphur in it is 8.89%, the value of x is