Multiple Choice QuestionsArgon is used
in filling airships
to obtain low temperature
in high temperature welding
in radiotherapy for treatment of cancer
The metal that produces red-violet colour in the non-luminous flame is
Ba
Ag
Rb
Pb
C.
Rb
Alkali metals and their salts impart a characteristic colour to flame. The reason for flame colouration is that the energy ofthe flame causes an excitation of the outermost electrons which when return to their original position, give out the energy so absorbed in the visible region. Thus, Rb gives red-violet colour to the flame.
Which of the following configurations corresponds to element of highest ionisation energy?
1s2, 2s1
1s2, 2s2, 2p3
1s2, 2s2, 2p2
1s2, 2s2, 2p6, 3s1
In long form of Periodic Table, the properties of the elements are a periodic function of their
atomic size
ionisation energy
atomic mass
atomic number
Which of the following is a wrong statement ? In a given period of the Periodic Table, the s-block element has, in general, a higher value of
electronegativity
atomic radius
ionisation energy
electron affinity
Which of the following is not correct ?
Hydrolysis of NCl3 gives NH3 and HOCl
NH3 is less stable than PH3
NH3 is a weak reducing reagent compared to PH3
Nitric oxide in solid state exhibits diamagnetic property
In III group precipitation, NH4Cl is added before adding NH4OH to
decrease conc. of OH-
prevent interference of PO
increase conc. of Cl-
increase conc. of OH- ion
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