Which of the following metallic oxide exhibit amphoteric nature?

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 Multiple Choice QuestionsMultiple Choice Questions

261.

Which of the following equations correctly represents the standard heat of formation (Hf°H) of methane ?

  • C (diamond) + 4H (g) → CH4 (g)

  • C (diamond) + 2H2 (g) → CH4 (g)

  • C (graphite) + 2H2 (g) → CH4 (g)

  • C (graphite) + 4H (g) → CH4 (g)


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262.

Which of the following metallic oxide exhibit amphoteric nature?

  • CaO

  • Al2O3

  • Na2O

  • BaO


B.

Al2O3

On moving across the third period acidic character increases so Na2O is strongly basic, Al2O3 is amphoteric in nature. If we go down iln a group (II) the basic character of the oxides increases or acidic character decreases Hence, CaO and BaO are basic in nature.


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263.

Borax bead test of Cr (chromium) is :

  • green

  • blue

  • violet

  • brown


264.

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite

  • is a non-crystalline substance

  • is an allotropic form of diamond

  • has molecules of variable molecular masses like polymers

  • has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds


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265.

The structure of diborane (B2H6) contains

  • four 2C-2e- bonds and four 3C-2e- bonds

  • two 2C-2e- bonds and two 3C-3e- bonds

  • two 2C-2e- bonds and four 3C-2e- bonds

  • four 2C-2e- bonds and two 3C-2e- bonds


266.

Dry ice is:

  • solid SO2

  • Solid NH3

  • Solid O2

  • Solid CO2


267.

Crystalline form of silica is called :

  • crystalline silicon

  • quartz

  • rock

  • talc


268.

The elements commonly used for making transistors are :

  • C and Si

  • Ga and In

  • P and As

  • Si and Ge


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269.

Buckminster fullerene is :

  • pure graphite

  • C-60

  • diamond

  • C-90


270.

White lead is

  • PbCO3PbO

  • PbCO3

  • Pb(OH)2.2PbCO3

  • PbSO4.PbO


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