List of top Chemistry Questions asked in AP EAMCET

The diffraction pattern of a crystalline solid gave a peak at \( 2\theta = 60^\circ \). What is the distance (in cm) between the layers that gave this peak? \[ \text{(Given: Wavelength } \lambda = 1.544\text{ Å, } \sin 30^\circ = 0.5, \sin 60^\circ = 0.866, n=1) \]
In which of the following reactions, dihydrogen is not evolved?
Aluminium carbide on reaction with \( D_2O \) gives \( Al(OD)_3 \) and ‘X’. What is ‘X’?
Arrange the following pesticides in the chronological order of their release into the market: A: Organophosphates
B: Organochlorides
C: Sodium chlorate
RMS velocity of one mole of an ideal gas was measured at different temperatures. A graph of \( (u_{\text{rms}})^2 \) (on y-axis) and \( T/K \) (on x-axis) gave a straight line passing through the origin, and its slope is \( 249 \, \text{m}^2 \text{s}^{-2}\text{K}^{-1} \). What is the molar mass (in kg mol\(^{-1}\)) of the ideal gas? \(( R = 8.3 \, \text{J mol}^{-1} \text{K}^{-1} )\)
Identify the incorrect statements from the following: I. \( \Delta S_{\text{system}} = (\Delta S_{\text{total}} + \Delta S_{\text{sur}}) \) II. \( A(l) \rightarrow A(s) \); for this process entropy change decreases III. Entropy units are \( J \ K^{-1} \ mol^{-1} \)
The correct formula used to determine the formal charge (\( Q_f \)) on an atom in the given Lewis structure of a molecule or ion is (V = number of valence electrons in free atom, U = number of unshared electrons on the atom, B = number of bonds around the atom)
Correct set of four quantum numbers for the valence electron of strontium (Z = 38) is
The de Broglie wavelength of a particle of mass 1 mg moving with a velocity of \( 10 \) ms\(^{-1}\) is (h = \( 6.63 \times 10^{-34} \) Js)
The bond lengths of diatomic molecules of elements X, Y, and Z respectively are 143, 110, and 121 pm. The atomic numbers of X, Y, and Z respectively are:

Two statements are given below 
Statement I: Benzanamine can be prepared from phthalimide. 
Statement II: Benzanamine is less basic than phenyl methanamine.

What are X and Z in the following reaction sequence? 

 

What is Y in the following reaction sequence? 


 

Observe the following set of reactions: 

Correct statement regarding Y and B is: 
 

What is X in the following reaction? 


 
 

What is D in the given sequence of reaction? 


 

Match the following: 



 

Amino acids are represented by the following general structure: 

Find out the pair in which amino acid is correctly matched with its group R: 
 

Sucrose is a disaccharide of which of the following?

In which of the following the polymer is correctly matched with the catalyst used for its preparation? 
I. Teflon - Persulphate 
II. Low density polythene - Triethyl aluminium and titanium tetrachloride 
III. Terylene - Zinc acetate/antimony trioxide 

The number of ions present in tris(ethane-1,2-diamine)cobalt(III) sulphate is:
Fusion of MnO\(_2\) with KOH in presence of KNO\(_3\) produces a dark green colour compound "X". X disproportionates in acidic solution and gives 'Y', 'Z' and water. The sum of spin only magnetic moment values of 'Y' and 'Z' is:
In the disproportionation reaction of nitrous acid, X is formed along with nitric acid and water. X can also be obtained by the reaction of:

Match the following:

The electrolyte which is highly effective for the coagulation of antimony sulphide sol is: