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Common salt (a typical crystalloid in an aqueous medium) behaves as a colloid in a benzene medium. Hence, we can say that a colloidal substance does not represent a separate class of substances. When the size of the solute particle lies between 1 nm and 1000 nm, it behaves as a colloid. Hence, we can say that colloid is not a substance but a state of the substance which is dependent on the size of the particle. A colloidal state is intermediate between a true solution and a suspension.
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Wood, charcoal, petrol and kerosene are some of the examples of fuel.
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| Electrochemical cell (Galvanic Cell) | Electrolytic cell |
| A Galvanic cell converts chemical energy into electrical energy. | An electrolytic cell converts electrical energy into chemical energy. |
| Here, the redox reaction is spontaneous and is responsible for the production of electrical energy. | The redox reaction is not spontaneous and electrical energy has to be supplied to initiate the reaction. |
| The two half-cells are set up in different containers, being connected through the salt bridge or porous partition. | Both the electrodes are placed in a same container in the solution of molten electrolyte. |
| Here the anode is negative and cathode is the positive electrode. The reaction at the anode is oxidation and that at the cathode is reduction. | Here, the anode is positive and cathode is the negative electrode. The reaction at the anode is oxidation and that at the cathode is reduction. |
| The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. | The external battery supplies the electrons. They enter through the cathode and come out through the anode. |
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Copper and silver can react with sulphur at high temperature inside the earth crust to form their sulphides although they are less reactive than hydrogen.
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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago
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The lead storage battery is the most important secondary cell. The cell reaction when the battery is in use are given below:
At anode: {tex}Pb(s) + SO_4^{2 - }(aq) \to PbS{O_4}(s) + 2{e^ - }{/tex}
At cathode: {tex}Pb{O_2}(s) + SO_4^{2 - }(aq) + 4{H^ + }(aq) + 2{e^ - } {/tex} {tex}\to 2PbS{O_4}(s) + 2{H_2}O(l){/tex}
The overall cell reaction is:
{tex}Pb(s) + Pb{O_2}(s) + 2{H_2}S{O_4}(aq) \to 2PbS{O_4}(s) + 2{H_2}O(l){/tex}
Anubhuti Khatri 6 years, 6 months ago
Posted by Daneal Ahmed 6 years, 6 months ago
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A solution having solute concentration same as that of the cell sap is called isotonic solution.
Deeksha Chaudhary 6 years, 6 months ago
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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago
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Order
- It is sum of powers to which concentration terms are raised in rate law or rate equation.
- It is determined experimentally.
- It can be zero or even in fraction
- The order of complex reaction can be determined and slowest step is rate determining step.
Molecularity
- It is the number of molecules taking part in the reaction.
- It is determined theoretically
- It is always in whole number
- Molecularity of each step is determined separately.
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Due to stronger S-S bond and due to small size and greater interelectronic repulsion.
Divyanshu Mishra 6 years, 6 months ago
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