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Physical Chemistry -- Atomic Structure
1.
A Cr atom in its ground state has a 3d5 4s1 configuration and a Cu atom
a 3d10 4s1 configuration. This is because a shell which is half-filled or completely filled is particularly
- A.strongly exchange-destabilized
- B.weakly exchange-stabilized
- C.strongly exchange-stabilized
- D.weakly exchange-destabilized
- Answer
- Report
Answer : [C]
2.
A d-shell containing four unpaired electrons can exchange
- A.four electrons
- B.three electrons
- C.sixteen electrons
- D.six electrons
- Answer
- Report
Answer : [D]
3.
Based on quantum mechanical theory, the electronic configuration of Pd(Z = 46) is
- A.4d9 5s 1
- B.4d10
- C.4d8 5s1
- D.4d10 5s2
- Answer
- Report
Answer : [B]
4.
When a gold sheet is bombarded by a beam of α-particles, only a few of
them get deflected whereas most go straight, undeflected. This is because
- A.the force of attraction exerted on the -particles by the oppositely charged electrons is not sufficient
- B.a nucleus has a much smaller volume than that of an atom
- C.the force of repulsion acting on the fast-moving -particles is very small
- D.the neutrons in the nucleus do not have any effect on the -particles
- Answer
- Report
Answer : [B]
5.
Which of the following statements is incorrect for anode rays?
- A.They are deflected by electric and magnetic fields.
- B.Their e/m ratio depends on the gas in the discharge tube used to produce the anode rays.
- C.The e/m ratio of anode rays is constant.
- D.They are produced by the ionization of the gas in the discharge tube.
- Answer
- Report
Answer : [C]
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