List of top Chemistry Questions asked in AP EAPCET

At \(25 ^\circ\text{C}\), \(K_a\) of formic acid is \(1.8 \times 10^{-4}\). What is the \(K_b\) of \( \text{HCOO}^- \)?
Two 1 L flasks at T(K) contain O2 and helium with rms velocities of x m s-1 and y m s-1, respectively. What is the relationship between x and y?
Kaolinite, a form of clay is the ore of metal X and malachite is the ore of metal Y. X and Y respectively are:
Identify the set containing isoelectronic species.
In which polymer preparation, Ziegler–Natta catalyst is used?
Which of the following will give a white precipitate with \( \text{AgNO}_3 \) solution?
A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?
Identify the incorrect statement about the group 13 elements
Which of the following does not exist?
At \( T \)(K), the vapour pressure of pure benzene and toluene are \( 75 \) and \( 22 \) mm Hg respectively. 23.4 g of benzene and 64.4 g of toluene are mixed to form an ideal solution. If the vapours are in equilibrium with the liquid mixture, the mole fraction of toluene in vapour phase is:
At T(K), the following gaseous equilibrium is established. W + X \( \rightleftharpoons \) Y + Z The initial concentration of W is two times to the initial concentration of X. The system is heated to T(K) to establish the equilibrium. At equilibrium the concentration of Y is four times to the concentration of X. What is the value of \(K_c\)?
The radius of fourth orbit in \( He^+ \) ion is \( R_1 \) pm and radius of third orbit in \( Li^{2+} \) ion is \( R_2 \) pm. The value of \( (R_1 - R_2) \) in pm is:
For which of the following processes entropy change (\(\Delta S\)) is negative?
I) Sublimation of dry ice
II) Freezing of water
III) Crystallisation of the dissolved substance
IV) Burning of rocket fuel
Observe the following numbers:
I) 0.0063
II) 132.00
III) 1004
The number of significant figures in I, II and III respectively is

The wavenumber of the first line (\(n_2 = 3\)) in the Balmer series of hydrogen is \( \overline{\nu}_1 \, \text{cm}^{-1} \). What is the wavenumber (in cm\(^{-1}\)) of the second line (\(n_2 = 4\)) in the Balmer series of He\(^{+}\)? 

Match the items given in List-I and List-II.

 

The \(E^\circ_{{M}^+_{(aq)}}/{M}_{(s)}\) is highest with negative sign for alkali metal 'x' and lowest with negative sign for alkali metal 'y'. In flame test, the characteristic colours of 'x' and 'y' are respectively:
What volume will 2 moles of an ideal gas occupy at STP (Standard Temperature and Pressure)?
Choose the incorrect statement from the following

How many of the following molecules / ions have a trigonal planar structure? 
\( \text{BO}_3^{3-}, \, \text{NH}_3, \, \text{PCl}_3, \, \text{BCl}_3, \, \text{ClF}_3, \, \text{XeO}_3 \)

The correct order of increasing bond lengths of C--H, O--H, C--C, and H--H is
What is the drug used to control depression and hypertension?
The enthalpy change (ΔH) for the reaction N2(g) + 3H2(g) → 2NH3(g) is -92 kJ/mol.

What is the enthalpy change for the decomposition of 1 mol of NH3(g) into its elements?
How many atoms are present in 1 mole of oxygen gas (O2)?
The metal purified by Mond process is X. The number of unpaired electrons in X is