List of top Chemistry Questions asked in AP EAPCET

The reactions which occur in blast furnace at 500 – 800 K during extraction of iron from haematite are 
 i. \(3Fe_2O_3 + CO \rightarrow 2Fe_3O_4 + CO_2\)
ii. \(Fe_2O_3 + 3C \rightarrow 2Fe + 3CO\)
iii. \(FeO + 4CO \rightarrow 3Fe + 4CO_2\)
iv. \(FeO + CO \rightarrow 2FeO + CO_2\)

Which sol is used as an intramuscular injection? 

‘X’ is a protecting colloid. The following data is obtained for preventing the coagulation of 10 mL of gold sol to which 1 mL of 10% NaCl is added. What is the gold number of ‘X’?

For a first-order reaction, the concentration of reactant was reduced from 0.03 mol L\(^{-1}\) to 0.02 mol L\(^{-1}\) in 25 min. What is its rate (in mol L\(^{-1}\) s\(^{-1}\))? 

Aqueous CuSO4 solution was electrolysed by passing 2 amp of current for 10 min. What is the weight (in g) of copper deposited at cathode? (Cu = 63 u; F = 96500 C mol-1)

The osmotic pressure of seawater is 1.05 atm. Four experiments were carried out as shown in the table. In which of the following experiments, pure water can be obtained in part-II of the vessel?
 

The density of nitric acid solution is 1.5 g mL\(^{-1}\). Its weight percentage is 68. What is the approximate concentration (in mol L\(^{-1}\)) of nitric acid? (N = 14 u; O = 16 u; H = 1 u)

A solid compound is formed by atoms of A (cations), B (cations), and O (anions). Atoms of O form an hcp lattice. Atoms of A occupy 25% of tetrahedral holes and atoms of B occupy 50% of octahedral holes. What is the molecular formula of the solid? 

An alkene X (\( C_4H_8 \)) on reaction with HBr gave Y (\( C_4H_9Br \)). Reaction of Y with benzene in the presence of anhydrous \( AlCl_3 \) gave Z which is resistant to oxidation with \( KMnO_4 + KOH \). What are X, Y, Z respectively? 

The number of nucleophiles in the following list is: \[ CH_3NH_2, \quad CH_3CHO, \quad C_2H_4, \quad CH_3SH \]

Match the following:
 

Which of the following oxides is acidic in nature?

The bond angles \( b_1, b_2, b_3 \) in the above structure are respectively in \( ^\circ \):

Ba, Ca, Sr form halide hydrates. Their formulae are \( BaCl_2 \cdot xH_2O \), \( CaCl_2 \cdot yH_2O \), \( SrCl_2 \cdot zH_2O \). The values of \( x, y, z \) respectively are:
‘X’ on hydrolysis gives two products. One of them is solid. What is ‘X’?
At 27°C, 100 mL of 0.4 M HCl is mixed with 100 mL of 0.5 M NaOH. To the resultant solution, 800 mL of distilled water is added. What is the pH of the final solution?
For the reaction: \[ A_2(g) \rightleftharpoons B_2(g) \] The equilibrium constant \( K_c \) is given as 99.0. In a 1 L closed flask, two moles of \( B_2(g) \) is heated to T(K). What is the concentration of \( B_2(g) \) (in mol L\(^{-1}\)) at equilibrium?
Identify the molecule for which the enthalpy of atomization \( (\Delta_a H^\circ) \) and bond dissociation enthalpy \( (\Delta_{\text{bond}} H^\circ) \) are not equal.
Observe the following reaction: \[ 2A_2(g) + B_2(g) \xrightarrow{T(K)} 2A_2B(g) + 600 \text{ kJ} \] The standard enthalpy of formation \( (\Delta_f H^\circ) \) of \( A_2B(g) \) is:

Given below are two statements: Statement-I: In the decomposition of potassium chlorate, Cl is reduced. 
Statement-II: Reaction of Na with \( O_2 \) to form \( Na_2O \) is a redox reaction. 

At 133.33 K, the RMS velocity of an ideal gas is \[ (M = 0.083 \text{ kg mol}^{-1}, R = 8.3 \text{ J mol}^{-1} \text{ K}^{-1}) \]

Two statements are given below: Statement-I: The ratio of the molar volume of a gas to that of an ideal gas at constant temperature and pressure is called the compressibility factor. 
Statement-II: The RMS velocity of a gas is directly proportional to the square root of \( T(K) \). 

Observe the following structure:
 
The formal charges on the atoms 1, 2, 3 respectively are:

The correct order of bond angles of the molecules \( SiCl_4 \), \( SO_3 \), \( NH_3 \), \( HgCl_2 \) is:

Match the following: