List of practice Questions

Give a brief account of the counter current mechanism.

Which of the following statements related to the modern periodic table is incorrect?

Draw a standard ECG and explain the different segments in it.

What is K_c for the following equilibrium when the equilibrium concentration of each substance is: [SO₂]= 0.60 M, [O₂] = 0.82 M and [SO₃] = 1.90 M ?
\(2SO_2(g) + O_2(g) ⇋ 2SO_3(g)\)

Which one of the following statements is incorrect in relation to ionization enthalpy?

Considering the elements B, Al, Mg, and K, the correct order of their metallic character is:

Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is:

At a certain temperature and total pressure of 10⁵ Pa, iodine vapour contains 40% by volume of \(\text {I}\) atoms
\( I_2 (g) ⇋ 2I (g)\)
Calculate K_p for the equilibrium.

Describe the evolutionary change in the pattern of heart among the vertebrates.

Distinguish cytokinesis from karyokinesis.

Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidizing property is:

How does cytokinesis in plant cells differ from that in animal cells?

Write the expression for the equilibrium constant, K_c for each of the following reactions: 

1. \(2NOCl (g) ⇋ 2NO (g) + Cl_2 (g)\)
2. \(2Cu(NO_3)_2 (s) ⇋ 2CuO (s) + 4NO_2 (g) + O_2 (g)\)
3. \(CH_3COOC_2H_5(aq) + H_2O(l) ⇋ CH_3COOH (aq) + C_2H_5OH (aq)\)
4. \(Fe^{3+} (aq) + 3OH^– (aq) ⇋ Fe(OH)_3 (s)\)
5. \(I_2 (s) + 5F_2 ⇋ 2IF_5\)

Define octet rule. Write its significance and limitations.

Discuss the shape of the following molecules using the VSEPR model: 
BeCl₂, BCl₃, SiCl₄, AsF₅, H₂S, PH₃

Although geometries of NH₃ and H₂O molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.

Explain the important aspects of resonance with reference to the \(CO_3^{2-}\) ion.

H₃PO₃ can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing H₃PO₃ ? If not, give reasons for the same.

Find out the value of \(K_c\) for each of the following equilibria from the value of \(K_p\): 

1. \(2NOCl (g) ⇋ 2NO (g) + Cl_2 (g); \ K_p= 1.8 × 10^{–2}\  at \ 500\ K\)
2. \(CaCO_3 (s) ⇋ CaO(s) + CO_2(g); \ K_p= 167 \ at \ 1073\  K\)

What is the difference between lymph and blood?

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions:

1. K and S 
2. Ca and O 
3. Al and N.

Write the significance/applications of dipole moment.

Define electronegativity. How does it differ from electron gain enthalpy?

Arrange the bonds in order of increasing ionic character in the molecules: LiF, K₂O, N₂, SO₂ and ClF₃.

Explain the process of inspiration under normal conditions.