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Electrovalent compounds are:
(1) Good conductor of electricity
(2) Polar in nature
(3) Low M.P. and low B.P.
(4) Easily available
Ans: Polar in nature
Which of the following has the least energy: (1) 2p (2) 3p (3) 2s (4) 4d Ans: 2s
What are ferrites? Ferrites are ceramic compounds having trivalent metal having three valence electrons iron and oxide of divalent element i.e. metals having two free electrons
The magnetic quantum number specifies : (1) Size of orbitals (2) Shape of orbitals (3) Orientation of orbitals (4) Nuclear stability Ans: Orientation of orbitals
Which of the following sets of quantum numbers represent an impossible arrangement: n l m m2 (1) 3 2 - 2 (+)
Ions which have the same electronic configuration are those of: (1) Lithium and sodium (2) Sodium and potassium (3) Potassium and calcium (4) Oxygen and chlorine An
what are the different types of method for the preparation of DDT?
internal conditioning
Evaporation theory and describe advantages, disadvantages and application?
The only nonradioactive isotope of fluorine has 9 protons and 10 neutrons. a. What is its mass number. b. Write the full symbol of this atom.
Determine about the Line and Surface Imperfection Line imperfection: Displacement with a curved boundary produces a mixed dislocation line at the boundary. Surface Imp
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