List of top Chemistry Questions asked in TS EAMCET

Aryl halides are less reactive towards nucleophilic substitution reaction when compared to alkyl halides. This is because
• [I.] If aryl cation is formed, it is not stabilized by resonance
• [II.] $\text{C}-\text{X}$ has partial double bond character due to resonance}
• [III.] $\text{sp}^3$-hybridized carbon is attached to the halogen}
• [IV.] $\text{C}-\text{X}$ bond length is more} The correct reasons are

Identify Z in the given sequence of reactions:

What is the amino acid which does not contain $-\text{NH}_2$ group in its structure?}

Observe the following reactions:
XeF$_6$ + H$_2$O $\rightarrow$ A + 2HF
XeF$_6$ + 2H$_2$O $\rightarrow$ B + 4HF
Hybridization of central atom in A, B respectively is:

German silver is an alloy of:

Ziegler-Natta catalyst is used in the manufacture of high density polyethene. It contains (C$_2$H$_5$)$_3$Al and chloride of a transition metal 'X'. What is 'X'?

Which of the following correctly represents the graph between $\log\left(\frac{m}{x}\right)$ and $\log P$?

Given below are two statements:
Statement-I: Reducing property of dioxide increases from $\text{SO}_2$ to $\text{TeO}_2$.}
Statement-II: $\text{Pb}_3\text{O}_4$ on heating gives lead dioxide and oxygen.}
The correct answer is:

Which one of the following statements is not correct regarding interhalogen compounds?

Analysis shows that a transition metal forms an oxide with the formula \[ \mathrm{M}_x\mathrm{O}_{1.00} \] (where \(x<1\)). The ratio of \(\mathrm{M}^{3+}\) and \(\mathrm{M}^{2+}\) ions in the oxide is:

The mixture which shows negative deviation from Raoult's law is:

What is the SRP for the following reaction? \[ \text{M}^{3+}(\text{aq}) + 3e^- \rightarrow \text{M}(\text{s}) \] Given: \[ 2\text{M}(\text{s}) + 3\text{Zn}^{2+}(\text{aq}) \rightarrow 2\text{M}^{3+}(\text{aq}) + 3\text{Zn}(\text{s}), \quad E^\circ = 0.90\text{ V} \] \[ \text{Zn}^{2+}(\text{aq}) + 2e^- \rightarrow \text{Zn}(\text{s}), \quad E^\circ = -0.76\text{ V} \]

In Lassaigne’s test, violet colour is formed when sodium fusion extract of an organic compound is treated with solution of ‘X’. What is ‘X’?

\[ n\text{-Heptane} \xrightarrow{X} \text{Toluene} \] \(X\) represents:

The time taken for 10% completion of a first order reaction is 20 minutes. The time taken for 19% completion of the same reaction will be:

The metal oxides which cannot be reduced by CO are: \[ \text{I. }Li_2O \] \[ \text{II. }MgO \] \[ \text{III. }Al_2O_3 \] \[ \text{IV. }ZnO \] The correct answer is (only):

In group 13 elements, X has lowest melting point and Y has lowest boiling point. X and Y are respectively:

Identify the correctly matched sets containing compound and its use from the following: \[ \text{I. Baking soda -- as mild antiseptic} \] \[ \text{II. Caustic soda -- in purification of bauxite} \] \[ \text{III. Washing soda -- in the manufacture of borax} \] The correct answer is (only):

Which one of the following is not a component of photochemical smog?

In the nitration of benzene with a mixture of concentrated \(HNO_3\) and concentrated \(H_2SO_4\), the active species involved is:

2 moles of ammonia gas is present in a 5.0 L flask at \(27^\circ C\). The pressure of it (in atm) using van der Waals equation is: \[ a=4.17,\qquad b=0.0371,\qquad R=0.0821 \]

In the unbalanced reactions given below, the oxidation numbers of oxygen in X, Z and Y are respectively: \[ Li+O_2 \rightarrow X \] \[ Na+O_2(\text{excess}) \rightarrow Z \] \[ K+O_2(\text{excess}) \rightarrow Y \]

The mass of \(CaCO_3\) (in g) required to react completely with 25 mL of 0.75 M HCl is: \[ (Ca=40,\; C=12,\; O=16) \]

8 g of NaOH is dissolved in 1.0 L solution containing one mole of acetic acid and one mole of sodium acetate. The pH value of the resulting solution is: \[ pK_a=4.74 \]

At 298 K for reaction \(X \rightleftharpoons Y\), if \(\Delta H^\circ=28.4\;kJ\) and equilibrium constant is \(10^{-7}\), then the standard entropy change for the reaction is: