List of top Chemistry Questions asked in TS EAMCET

The decomposition of benzene diazonium chloride is a first-order reaction. The time taken for its decomposition to \( \frac{1}{4} \) and \( \frac{1}{10} \) of its initial concentration are \( t_{1/4} \) and \( t_{1/10} \) respectively. The value of \( \frac{t_{1/4}}{t_{1/10}} \times 100 \) is: (Given: log 2 = 0.3)
At 300 K, 0.06 kg of an organic solute is dissolved in 1 kg of water. The vapour pressure of the solution is 3.768 kPa. If the vapour pressure of pure water at that temperature is 3.78 kPa, what is the molar mass of the solute (in g mol\(^{-1}\))?
Kaolinite is a silicate mineral of metal 'X' and calamine is a carbonate mineral of metal 'Y'. X and Y respectively are:
In the reaction: \[ NH_2CONH_2 + 2H_2O \rightarrow [X] \rightleftharpoons 2NH_3 + H_2O + [Y] \] The hybridization of carbon in \( X \) and \( Y \) respectively are:
10 mL of 0.5 M NaCl is required to coagulate 1L of \( Sb_2S_3 \) sol in 2 hours time. The flocculating value of NaCl (in millimoles) is:
Among the hydrides \( NH_3, PH_3, \) and \( BiH_3 \), the hydride with highest boiling point is \( X \) and the hydride with lowest boiling point is \( Y \). What are \( X \) and \( Y \) respectively?

Identify the structure of the polymer ‘P’ formed in the given reaction: 

Which of the following vitamins is also called pyridoxine?

The number of -OH groups present in the structures of bithionol, terpineol, and chloroxylenol is respectively:

Conversion of X to Y in the given reaction corresponds to:

Identify the complex ion with electronic configuration \( t_{2g}^{3} e_{g}^{2} \).
In which of the following ions the spin-only magnetic moment is lowest?

Xenon (VI) fluoride on complete hydrolysis gives an oxide of xenon 'O'. The total number of \( \sigma \) and \( \pi \) bonds in 'O' is:

The standard enthalpy of combustion of C (graphite), H\(_2\) (g) and CH\(_3\)OH (l) respectively are \(-393\), \(-286\) and \(-726\) kJ mol\(^{-1}\). What is the standard enthalpy of formation of methanol?

Match the following: 

A current of 15.0 amperes is passed through a solution of CrCl2, for 45 minutes. The volume of Cl2 , (in I) obtained at the anode at 1 atm and 273 K is around (IF=96500 Cmol-1, At. wt. of Cl=35.5, R=0.082 L-atmK-1 mol-1)

The rate law for the decomposition of hydrogen iodide is - = d[HI]/dt = k[HI]2. The units of rate constant k are: 

Consider the following statements about the oxides of halogens 
A. At room temperature, OF2; is thermally stable 
B. Order of stability of oxides of halogens is I > Br > Cl 
C. I2O5 is used in the estimation of CO 
D. ClO2; is used as a bleaching agent 
The correct statements are

According to MO theory, the molecule which contain only π-Bonds between the atoms is

In which if the following changes there is no change in hybridization of the central atom?

The common name of benzene -1, 3- diol is

Arrange the following in the correct order of their reactivity towards nucleophilic addition reactions

R is one of the monomers for the formation of a polymer called

Which of the following is least reactive towards Sn1 reactions?

The following molecule with the structure acts as