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Q. Explain about Neutral and Amphoteric oxides?
Neutral oxides have neither acidic nor basic properties and when dissolved in water, they give neutral solutions, e.g., CO, N20, etc.
Amphoteric oxides show both acidic and basic properties. They react with acids as well as with alkalis to give salt and water, e.g., Al203, ZnO, PbO, etc.
ZnO + 2HCl-----------------> ZnCl2+ H2O
ZnO + 2NaOH---------------> Na2ZnO2+ H2O
Al2O3+ 6HCl--------------> 2AlCl3+ 3H2O
Al2O3+ 2NaOH + 3H2O-----------> 2NaAl (OH)4
The energy of the electron in the first orbit of He + is -871.6x 10 -20 J . The energy of the electron in the first orbit of hydrogen would be : (1) -871.6 x10 -20 J
Where is tin obtained? Ans) Tin is obtained in several places tin is found mainly in the ore cassiterite, which is originate in Malaysia, Bolivia, Thailand, and Nigeria.
Uses of Acetic anhydride (a) Acetic anhydride is used as an acetylating agent. (b) Acetic anhydride is used for the detection and estimation of hydroxyl and amino group.
convert km to m
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Q. What are the types of emulsions? Emulsions can be of three types: 1) Temporary emulsion: These require vigorous shaking just before they are used, as they separate out e
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The maximum number of electrons in p -orbital with n= s, m=1 is: (1) 6 (2) 2 (3) 14 (4) 10 Ans: 2
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How do impurities and temperature affect electrical resistivity of metals? Ans: Temperature effect on resistivity: Any increase in temperature of a conductor increase
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