11.

Consider the following compounds


Hyperconjugation occurs in 

• I only

• II only

• III only

• III only

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

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

• 4

• 8

• 12

• 12

'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

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)

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

Which of the following options represents the correct order? 

• O₂^-> O₂>O₂⁺

• O₂^-<O₂<O₂⁺

• O₂^->O₂<O₂⁺

• O₂^->O₂<O₂⁺

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

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

• NO₂

• NO₂^-

• NO₂⁺

• NO₂⁺

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.