the heat evolved in chemisoption lies in the range (in kJ/mol) of :
The heat of adsorption in physisorption lies in the range of (in kJ/ mol)
each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STAMENT-1: More heat evolved in physiorpiton than in chemisorption. STATEMENT-2: Molecules of adsorbate and adsorbent are held by van der Waal's forces in physisorption and by chemical bonds in chemisorption.
In the presence of a catalyst, the heat evolved or absorbed during the reaction ___________ .
At 25^(@)C , when 1 mole of MgSO_(4) was dissolved in water, the heat evolved was found to be 91.2 kJ. One mole of MgSO_(4) . 7H_(2)O on dissolution gives a solution of the same composition accompanied by an absorption of 13.8 kJ. The enthalpy of hydration, i.e., DeltaH_(h) for the reaction MgSO_(4)(s) + 7H_(2)O(l)rarrMgSO_(4) . 7H_(2)O(s) :
Name the part of electromagnetic spectrum,whose wavelength lies in the range of 10^(-10) m .Give its one use.
Pratyush took sulphur powder on a spatula and heated it. he collected the gas evolved by inverting a test tube over it as shown in figure. what will be the action of gas on. dry litmus paper.
