Metals are usually not found as nitrates in their ores Out of t

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Consider the following compounds


Hyperconjugation occurs in 

  • I only

  • II only

  • III only

  • III only

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12.

The enolic form of ethyl acetoacetate as below has

  • 18 sigma bonds and 2 pi-bond

  • 16 sigma bonds and 1 pi-bond

  • 9 sigma bonds and 2 pi-bond

  • 9 sigma bonds and 2 pi-bond

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13.

The total number of Pi bond electrons in the following structure is

  • 4

  • 8

  • 12

  • 12

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14.

'Metals are usually not found as nitrates in their ores'
Out of the following two (a and b) reasons which isare/are true for the above observation?
I. Metal nitrates are highly unstable.
II.Metal nitrates are highly soluble in water.

  • I and II are true

  • I and II are false

  • I is false but II is true

  • I is false but II is true


C.

I is false but II is true

Metals are usually not found as nitrates in their ores, because metal nitrates are highly soluble in water. For example, KNO3 (salt peter) would be classified as completely soluble. Thus, KNO3  could be expected to dissociate completely in aqueous solution into K+ and NO3- ions.

The nitrate anion has three equivalent oxygen surrounding a central nitrogen atom. This tends to spread the single negative charge and make it easier for water to separate the ions in solution.

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15.

Because of lanthanoid contraction, of elements which of the following elements have nearly same atomic radii ? (Number in the parenthesis are atomic number).

  • Ti (22) and Zr(40)

  • Zr(40) and Nb (41)

  • Zr (40) and Hf (72)

  • Zr (40) and Hf (72)

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16.

Which of the following processes does not involve oxidation of iron?

  • Rusting of iron sheets

  • Decolourisation of blue CuSO4 solution by iron

  • Formation of Fe(CO)5 from Fe

  • Formation of Fe(CO)5 from Fe

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17.

Which of the following options represents the correct order? 

  • O2-> O2>O2+

  • O2-<O2<O2+

  • O2->O2<O2+

  • O2->O2<O2+

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18.

Nitogen dioxide and sulphur dioxide have some properties in common. which property is shown by one of these, comounds but not the order? 

  • Forms acid -rain

  • Is a reducing -agent

  • Is a soluble in water

  • Is a soluble in water

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19.

The maximum bond angle at nitrogen is present in which of the following?

  • NO2

  • NO2-

  • NO2+

  • NO2+

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20.

Which of these statements about [Co(CN)6]3- is true?

  • [Co(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.

  • [Co(CN)6]3-  has four unpaired electrons and will be in a low-spin configuration

  • [Co(CN)6]3-  has four unpaired electrons and will be in high-spin configuration.

  • [Co(CN)6]3-  has four unpaired electrons and will be in high-spin configuration.

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