Surface Chemistry MCQ - 1 (Advanced) - JEE MCQ

Which statement(s) is /are correct

Colloidal solution can be purified by

Coagulation of colloids can be achieved by

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present, e.g. H₂O is adsorbed to more extent on silica gel than N₂ and O₂. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbent can displace a weakly adsorbed substance from the surface of an adsorbent.

Q.

Which of the gas can displace remaining all the gases.

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present, e.g. H₂O is adsorbed to more extent on silica gel than N₂ and O₂. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbent can displace a weakly adsorbed substance from the surface of an adsorbent.

Q.

 When temperature is increased

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present, e.g. H₂O is adsorbed to more extent on silica gel than N₂ and O₂. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbent can displace a weakly adsorbed substance from the surface of an adsorbent.

Q.

Activated charcoal is prepared by

The clouds consist of charged particles of water dispersed in air. Some of them are + vely charged, others are negatively charged. When + vely charged clouds come closer they have cause lightening and thundering whereas when + ve and -ve charged colloids closer they cuase heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus coagulation the mist hanging in air.

Q.

When excess of AgNO₃ is treated with KI solution, Agl forms

The clouds consist of charged particles of water dispersed in air. Some of them are + vely charged, others are negatively charged. When + vely charged clouds come closer they have cause lightening and thundering whereas when + ve and - ve charged colloids closer they cuase heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus coagulation the mist hanging in air.

Q.

Clouds are colloids solution of

The clouds consist of charged particles of water dispersed in air. Some of them are + vely charged, others are negatively charged. When + vely charged clouds come closer they have cause lightening and thundering whereas when + ve and - ve charged colloids closer they cuase heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus coagulation the mist hanging in air.

Q.

Electrical chimneys are made on the principle of

Assertion : Isoelectric point is pH at which colloidal can move towards either of electrode

Reason : At isoelectric point, colloidal particles become electrically neutral.

Assertion : When AgNO₃ is treated with excess of potassium iodie, colloidal particles gets attracted towards anode.

Reason : Precipitate adsorb common ion (excess) and thus become charged.

Assertion : For adsorption ΔG, ΔH, ΔS all have - ve values

Reason : Adsorption is a spontaneous exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.

Assertion : A gas with higher critical temperature gets adsorbed to more extent than a gas with lower critical temperature.

Reason : The easily liquifiable gases get adsorbed to more extent.

Assertion : Physical adsorption of molecules on the surface requires activation energy. 

Reason : Heat of adsorption is –ve.

Match the Column

Column -I                                                                       Column - II

(A) Both Dispersed phase(DP) and Dispersion                    (P) Milk

Medium (DM) are in same physical state

(B) DP and DM are in different Physical state                     (Q) Fog

(C) DM is liquid                                                                  (R) Smoke

(D) DP is liquid                                                                  (S) Foam

Among the electrolytes Na₂SO₄, CaCl_2, Al₂(SO₄)₃ and NH₄Cl, the most effective coagulating agent for Sb₂S₃ sol is

 Column I                                        Column II

A. Electrophoresis                            P. Movement of molecules of D M

B. Electro-Osmosis                          Q.Mechanical property

C. Tyndall effect                                R. Optical property

D. Brownian movement                      S. Determination of charge on colloidal particle