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Q. What is Alloys?
Metals have a property of combining with other metals to form alloys. An alloy may be defined as a solid which is formed by a combination of two or more metallic elements, but it itself has metallic properties. Most alloys are solid solutions. For example, brass an alloy of copper and zinc is a solid solution of zinc in copper. In brass some of the copper atoms of face-centred cubic lattice are randomly replaced by zinc atoms. Similarly, bronze an alloy of copper and tin is a solid solution of tin in copper. But not all alloys are solid solutions. Some alloys, such as bismuth-cadmium alloys are heterogeneous mixtures containing tiny crystals of the constituent metals. Others such as MgCu2 are intermetallic compounds which contain metals combined in definite proportions.
Price ceiling problems: The persistent shortage created by price ceiling will in turn pose the following problems: Rationing Government may have to apportion the quantity s
Hydrogen
For p-orbital, the magnetic quantum number has value: (1) 2 (2) 4, - 4 (3) - 1, 0, +1 (4) 0 Ans: - 1, 0, +1
The magnetic quantum number of valence electron of sodium (Na) is: (1) 3 (2) 2 (3) 1 (4) 0 Ans: 0
Q. Illustrate the Quantum Mechanics? Ans: In 1924, a French scientist named Louis de Broglie proposed another model for the nature of the electrons in atoms. He predicted tha
Which one is least ionic in the following compounds: (1) Agcl (2) Kcl (3) Bacl 2 (4) Cacl 2 Ans: Agcl
What is meant by linear combination of atomic orbitals? State bonding and antibonding molecular orbitals based on bomo-nuclear dihydrogen molecule.
Two reactions have identical value of Ea. Does it the mean that they have same rate constant if run at the same temperature?Illustrate.
What is doping
In which one of the following pairs of experimental observations and phenomenon does the experimental observation correctly account for phenomenon: (1) X-ray spectra
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