Chemistry Test 191

For the decomposition of HI the following logarithmic plot is shown : 

[R = 1.98 cal/mol-K] 

The activation energy of the reaction is about :

Rate constant for the reaction NO₂+ CO → NO + CO₂ are 1.3 M^-1S^-1 at 700 K and 23 M^-1S^-1 at 800 K. What will 3 be the rate constant at 750 K ?

Given that the normal energy of the reactant and product are 40J and 20J respectively and threshold energy of the uncatalysed reaction is 120 J. If the rate of uncatalysed reaction at 400 K becomes equal to the rate of catalysed reaction at 300 K, then what will be the activation energy of the catalysed forward and backward reactions respectively?

If uranium (mass number 238 and atomic number 92) emits an α-particle, then mass number and atomic number of product are respectively :

An aqueous solution of NaCI freezes at -0.186°C. Given that  the elevation in boiling point of this solution is :

For a saturated solution of AgCI at 25°C, k = 3.4 x 10^-6 ohm^-1 cm^-1 and that of H₂O(ℓ) used is 2.02 x 10^-6 ohm^-1 cm^-1. λ°m for AgCI is 138 ohm^-1 cm² mol^-1, then the solubility of AgCl in moles per liter will be :

The vapour pressure of pure liquid solvent A is 0.80 atm. When a non-volatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm. mole fraction of the component B in the solution is :

Osmotic pressure  [in atm] of a 0.1 M solution of K₄[Fe(CN)₆], which undergoes 50% dissociation, will be ________ at 27⁰C :

What weight of glucose dissolved in 100 grams of water will produce the same lowering of vapour pressure as one gram of urea dissolved in 50 grams of water, at the same temperature?