The position of some metals in the electrochemical series in decreasing electropositive character is given as Mg gt Zn gt Cu gt Ag. What will happen if a copper spoon is used to stir a solution of aluminium nitrate?
The position of some metals in the electrochemical series in decreasing electropositive character is given as Mg gt Zn gt Cu gt Ag. What will happen if a copper spoon is used to stir a solution of aluminium nitrate?
A
The solution becomes blue
B
The spoon will get coated with Al
C
An alloy of Cu and Al is formed
D
There is no reaction
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D
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The position of some metals in the electrochemical series in dectreasing electropositeve character is given as Mg gt Al gt Zn gt Cu gt Ag . What will happen if a copper spoon is used to stir a solution of aluminimum nitrate ?
The position of some metals in the electrochemical series in dectreasing electropositeve character is given as Mg gt Al gt Zn gt Cu gt Ag . What will happen if a copper spoon is used to stir a solution of aluminimum nitrate ?
The position of some metals in the electrochemical series in dectreasing electropositeve character is given as Mg gt Al gt Zn gt Cu gt Ag . What will happen if a copper spoon is used to stir a solution of aluminimum nitrate ?
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In the figure shown a massless spring of stiffness k and natural length l_(0) is rigidly attached to a block of mass m and is in vertical position. A wooden ball of mass m is released from rest to fall under gravity. Having fallen a height h the ball strikes the spring and gets stuck up in the spring at the top. What should be the minimum value of h so that the lower block will just lose contact with the ground later on ? Assume that l_(0) gt gt (4mg)/(k) . Neglect any loss of energy. (Given k=mg//2 )
The following diagram shown as electrochemical cell in which the respective half-cells contains aqueous 1.0M solutions of the salts XCl_(2) and YCl_(3) . Given that 3X(s)+2Y^(3+) (aq) to 3X^(2)(aq)+2Y(s) epsi_("cell") gt 0 Which of the following statements is correct? I. The electrode made from metal X has positive polarity II. Electrode Y Is the anode II. Tho flow of electrons is from Y to X IV. The reaction at electrode X is an oxidation V. The salt bridge would most likely contain silver nitrate
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The colloidal particles are electrically charged as a indicated by their migration towards cathode or anode under the applied electric field. In a particular colloidal system, all particles carry either positive charge or negative charge. The electric charge on colloidal particles orginate in several ways. According to preferential adsorption theory, the freshly obtained precipitate particles adsorb ions from the dispersion medium, which are common to their lattice and acquire the charge of adsorbed ions. For example, For example, freshly obtained Fe(OH)_(3) precipitated is dispersed, by a little FeCl_(3) , into colloidal solution owing to the adsorption of Fe^(3+) ions in preference. Thus sol particles will be positively charged. In some cases the colloidal particles are aggregates of cations or anions having ampiphilic character. When the ions posses hydrophobic part (hydrocarbon end) as well as hydrophilic part (polar end group), they undergo association in aqueous solution to form particles having colloidal size. The formation of such particles, called micelles plays a very important role in the solubilization of water insoluble substances, (hydrocarbon, oils, fats, grease etc.). In micelles, the polar end groups are directed towards water and the hydrocarbon ends into the centre. The charge on sol particles of proteins depends on the pH. At low pH, the basic group of protein molecule is ionized (protonated) and at higher pH (alkaline medium), the acidic group is ionized. At isoelectric pH, characteristic to the protein, both basix and acidic groups are equally ionized. The stability of colloidal solution is attributed largely to the electric charge of the dispersed particles. This charge causes them to be coagulated or precipitated. On addition of small amount of electrolytes, the ions carrying oppiste charge are adsorbed by sol particles resulting in the neutralization of their charge. When the sol particles either with no charge or reduced charge, come closer due to Brownian movement, they coalesce to form bigger particles resulting in their separation from the dispersion medium. This is what is called coagulating or precipitation of the colloidal solution. The coagulating power of the effective ion, which depend on its charge, is expressed in terms of its coagulating value, defined as its minimum concentration (m mol/L) needed to precipitate a given sol. Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl, Na_(2)SO_(4) and Na_(3)PO_(4) solutions. Their coagulating values will be in the order :
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