List of practice Questions

Briefly mention the mechanism of action of FSH.

Although both $CO_2$ and $H_2O$ are triatomic molecules, the shape of $H_2O$ molecule is bent while that of $CO_2$ is linear. Explain this on the basis of dipole moment.

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate the threshold frequency (ν₀) and work function (W₀) of the metal.

Define the bond length.

Use the data given in the following table to calculate the molar mass of naturally occuring argon isotopes:

Isotope	Isotopic molar mass	Abundance
³⁶Ar	35.96755 g mol^–1	0.337%
³⁸Ar	37.96272 g mol^–1	0.063%
⁴⁰Ar	39.9624 g mol^–1	99.600%

The conductivity of sodium chloride at 298 K has been determined at different concentrations and the results are given below:
Concentration/M 0.001 0.010 0.020 0.050 0.100
10² × κ/S m^-1 1.237 11.85 23.15 55.53 106.74
Calculate $\land_m$ for all concentrations and draw a plot between $\land_m$ and c ½. Find the value of $\land^0_m$.

How do you express the bond strength in terms of bond order?

Write the favourable factors for the formation of ionic bond.

How many significant figures should be present in the answer of the following calculations?

$\frac {0.02856 × 298.15 × 0.112}{0.5785}$
$5 × 5.364$
$0.0125 + 0.7864 + 0.0215$

100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as follows:

Number of letters	1 - 4	4 - 7	7 - 10	10 - 13	13 - 16	16 - 19
Number of surnames	6	30	40	16	4	4

Determine the median number of letters in the surnames. Find the mean number of letters in the surnames? Also, find the modal size of the surnames.

The refractive index of diamond is 2.42. What is the meaning of this statement?

The resistance of a conductivity cell containing 0.001M KCl solution at 298 K is 1500 Ω. What is the cell constant if conductivity of 0.001M KCl solution at 298 K is 0.146 x 10^-3 S cm^-1 .

You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table.
$refractive index of some material media$

The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 Scm^-1 . Calculate its molar conductivity.

Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.

What will be the mass of one $^{12}C$ atom in g?

Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.

Match the following (column I with column II) Column I Column II (a) Chlamydomonas (i) Moss (b) Cycas (ii) Pteridophyte (c) Selaginella (iii) Algae (d) Sphagnum (iv) Gymnosperm

Calculate the standard cell potentials of galvanic cells in which the following reactions take place:
(i) $2Cr_{(S)}+3Cd^{2+}_{(aq)} \rightarrow 2Cr^{3+}_{(aq)}+3Cd$
(ii) $Fe^{2+}_{(aq)}+Ag^+_{(aq)} \rightarrow Fe^{3+}_{(Aq)}+Ag(s)$
Calculate the $\triangle_rG^\ominus$ and equilibrium constant of the reactions.

Given the standard electrode potentials,
K⁺/K = -2.93V, Ag⁺/Ag = 0.80V,
Hg²⁺/Hg = 0.79V
Mg²⁺/Mg = -2.37 V, Cr³⁺/Cr = - 0.74V
Arrange these metals in their increasing order of reducing power.

Arrange the following metals in the order in which they displace each other from the solution of their salts.
Al, Cu, Fe, Mg and Zn

Draw the Lewis structures for the following molecules and ions: $H_2S$, $SiCl_4$, $BeF_2$, $CO_3^{2-}$ , $HCOOH$

The distribution below gives the weights of 30 students of a class. Find the median weight of the students.

Weight (in kg)	40 - 45	45 - 50	50 - 55	65 - 60	70- 65	65 - 70	70 - 75
Number of students	2	3	8	6	6	3	2

Calculate the molarity of a solution of ethanol in water, in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A)
(i) Z = 17, A = 35
(ii) Z = 92, A = 233
(iii) Z = 4, A = 9