IIT-JEE 1998

The geometry and the type of hybrid orbital present about the central atom in BF3 is

Read the following Assertion and Reason and answer as per the options given below
Assetion: LiCl is predominantly a covalent compound
Reason : Electronegativity difference between Li and Cl is too small

Interpret the non-linear shape of H2S molecule and non-planar shape of PCl3 using valence shell electron pair repulsion (VSEPR) theory. (Atomic numbers : H = 1, P = 15, S = 16, Cl = 17)

The rate constant of a reaction is 1.5 \(\times\) 107 s-1 at 50oC and 4.5 \(\times\) 107 s-1 at 100oC. Evaluate the Arrhenius parameters A and Ea.

Calculate the equilibrium constant for the reaction:
2Fe3+ + 3I- \(\leftrightharpoons\) 2Fe2+ + \(I_3^-\). The standard reduction potentials in acidic conditions are 0.78 V and 0.54 V respectively for Fe3+ | Fe2+ and \(I_3^-\) | I- couples.

Find the solubility product of a saturated solution of Ag2CrO4 in water at 298 K if the emf of the cell Ag|Ag+ (satd. Ag2CrO4 soln.) || Ag+ (0.1 M) | Ag is 0.164 V at 298 K.

Hydrogen peroxide acts both as an oxidising and as a reducing agent in alkaline solution towards certain first row transition metal ions. Illustrate both these properties of H2O2 using chemical equations.

Highly pure dilute solution of sodium in liquid ammonia

Work out the following using chemical equation :
Chlorination of calcium hydroxide produces bleaching powder.

A solution of a nonvolatile solute in water freezes at -0.30oC. The vapour pressure of pure water at 298 K s 23.51 mm Hg and Kf for water is 1.86 K kg mol-1. Calculate the vapour pressure of this solution at 298 K.

An aqueous solution containing 0.10 g KIO3 (formula weight = 214.0) was treated with an excess of KI solution. The solution was acidified with HCl. The liberated I2 consumed 45.0 mL of thiosulphate solution to decolourise the blue strach-io...

The orbital diagram in which the Aufbau principle is violated is

Decrease in atomic number is observed during

Which of the following statement(s) is (are) correct?

ASSERTION:
Nuclide \({}_{13}^{30}Al\) is less stable than \({}_{20}^{40}Ca\)
REASON:
Nuclides having odd number of protons and neutrons are generally unstable.

The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are)