List of top Chemistry Questions asked in TS EAMCET

Assertion (A): Silicones are used for waterproofing of fabrics. 
Reason (R): The repeating unit in silicones is 

Consider the following reactions: \[ \text{Cs} + O_2 (\text{excess}) \rightarrow X \] \[ \text{Cs} + O_2 (\text{limited}) \rightarrow X \] \[ \text{Na} + O_2 \rightarrow Y \] Identify the correct statement about \( X \) and \( Y \).
Observe the following species: (i) \( NH_3 \) (ii) \( AlCl_3 \) (iii) \( SnCl_4 \) (iv) \( CO_2 \) (v) \( Ag^+ \) (vi) \( HSO_4^- \) How many of the above species act as Lewis acids?
The normality of a 20-volume solution of hydrogen peroxide is:
A message signal of peak voltage 12 V is used to amplitude modulate a carrier signal of frequency 1.2 MHz. The amplitude of the side bands is:
The kinetic energy of electrons emitted, when radiation of frequency \( 1.0 \times 10^{15} \) Hz hits a metal, is \( 2 \times 10^{-19} \) J. What is the threshold frequency of the metal (in Hz)? (\( h = 6.6 \times 10^{-34} \) Js)
Identify the correct statement about the crystal defects in solids:

Reaction of conversion of Y to Z in the given reaction corresponds to: 

Arrange the following in the increasing order of pKa values. 

Identify the products R and S in the reaction sequence given. 

In the given reaction sequence, identify Z.

Consider the following reactions: \[ X + \text{O}_2 \;\longrightarrow\; \text{Cu}_2\text{O} + \text{SO}_2 \] \[ \text{Cu}_2\text{O} + 2\,\text{H}_2 \;\longrightarrow\; 2\,\text{Cu} + \text{H}_2\text{O} \] If the molecule \(Y\) is formed in the first reaction, the shape of molecule \(Y\) is:

What is the percentage of carbon in the product ‘X’ formed in the following reaction?

An element with molar mass \( 2.7 \times 10^{-2} \) kg mol\(^{-1}\) forms a cubic unit cell with an edge length of 405 pm. If its density is \( 2.7 \times 10^3 \) kg m\(^{-3}\), the number of atoms present in one unit cell is: (Given: \( N_A = 6.023 \times 10^{23} \) mol\(^{-1}\))
The molar conductivity of 0.02 M solution of an electrolyte is \( 124 \times 10^{-4} \) S m\(^{2}\) mol\(^{-1}\). What is the resistance of the same solution (in ohms), kept in a cell of cell constant 129 m\(^{-1}\)?
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\(^{-1}\))?
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)
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: 

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:

Which of the following vitamins is also called pyridoxine?