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InOrganic Chemistry -- Metals
6.
The lattice energies of the oxides of Mg, Ca, Sr and Ba follow the order
- A.BaO > SrO > CaO > MgO
- B.CaO > BaO > SrO > MgO
- C.MgO > SrO > CaO > BaO
- D.MgO > CaO > SrO > BaO
- Answer
- Report
Answer : [D]
7.
When an alkali metal is introduced into a flame, it imparts a distinctive
colour to it. The colour arises from
- A.electronic transitions in species formed momentarily in the flame
- B.the electronic transition 3s1⟶3p1
- C.proton–proton transition
- D.d–d transition
- Answer
- Report
Answer : [A]
8.
Which of the following is used in photoelectric cells?
- A.Na
- B.K
- C.Li
- D.Cs
- Answer
- Report
Answer : [D]
9.
When heated to 800oC, NaNO3 gives
- A.NaNO2 + O2
- B.Na2O + O2 + N2
- C.Na + N2 + O2
- D.NaN3 + O2
- Answer
- Report
Answer : [B]
10.
A solution of sodium metal in liquid ammonia is blue, and is a strong
reducing agent, due to the presence of
- A.sodium atoms
- B.sodium hydride
- C.sodium amide
- D.solvated electrons and solvated metal ions
- Answer
- Report
Answer : [D]
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