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question_answer1) Read the assertion and reason carefully to mark the correct option out of the options given below : Assertion : When a finely divided active carbon or clay is stirred into a dilute solution of a dye, the intensity of colour in the solution is decreased. Reason : The dye is adsorbed on the solid surface.
question_answer2) Assertion : The enthalpy of physisorption is greater than chemisorption. Reason : Molecules of adsorbate and adsorbent are held by van der Waals forces in physisorption and by chemical bonds in chemisorption.
question_answer3) Assertion : Silica gel is used for drying air. Reason : Silica gel adsorbs moisture from air.
question_answer4) Assertion : According to Freundlich: \[\frac{x}{m}k.{{P}^{1/n}}\]. Reason : The isotherm shows variation of the amount of gas adsorbed by the adsorbent with temperature.
question_answer5) Assertion : A reaction cannot become fast by itself unless a catalyst is added. Reason : A catalyst always increases the speed of a reaction.
question_answer6) Assertion : ZSM ? 5 is used as a catalyst in petrochemical industries. Reason : Zeolites are three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms.
question_answer7) Assertion : Lyophilic colloids are called as reversible sols. Reason : Lyophilic sols are liquid loving.
question_answer8) Assertion : Colloidal sols scatter light while true solutions do not. Reason : The particles in the colloidal sol more much slower than that of the true solution.
question_answer9) Assertion : Colloidal particles show Brownian movement. Reason : Brownian movement arises because of the impact of the molecules of the dispersion medium with the colloidal particles.
question_answer10) Assertion : For the coagulation of sols carrying positive charge, \[PO_{4}^{3-}\] ions are more efficient than \[SO_{4}^{2-}\]or \[C{{l}^{-}}\]ions. Reason : This follows Hardy ? Schulze rule.
question_answer11) Assertion : An emulsion becomes stable if soap is added to it . Reason : Soap contains hydrophilic and hydrophobic parts.
question_answer12) Assertion : Deep electric shock causes death of an animal. Reason : Electric shock coagulate the blood. [AIIMS 1995]
question_answer13) Assertion : A catalyst is more effective in finely divided form. Reason : Finely divided form has more surface area. [AIIMS 1998]
question_answer14) Assertion : \[N{{H}_{3}}\]absorb more readily over activated charcoal than \[C{{O}_{2}}\]. Reason : \[N{{H}_{3}}\]is non-polar. [AIIMS 2000]
question_answer15) Assertion : Sky appears blue colour. Reason : Colloidal particles of dust scatter blue light. [AIIMS 2000]
question_answer16) Assertion : Physical absorption of molecules takes place on surface only. Reason : In this process, the bonds of the absorbed molecules are broken. [AIIMS 2002]
question_answer17) Assertion : The micelle formed by sodium stearate in water has \[-CO{{O}^{-}}\]groups at the surface. Reason : Surface tension of water is reduced by the addition of stearate. [AIIMS 2003]
question_answer18) Assertion : Aqueous gold colloidal solution is red in colour. Reason : The colour arises due to scattering of light by colloidal gold particles. [AIIMS 2004]
question_answer19) Assertion : Increase in surface area, increase in rate of evaporation. Reason : Stronger the intermolecular attractive forces, fast is the rate of evaporation at a given temperature.
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