Multiple Choice QuestionsConsider 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
'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+
C.
NO2+
In all of the four molecules NO2- and NO2 have one lone pair thus bond angle is less 120 in the case of NO2- and more than 120 in the case of NO2 but in the NO3- there is no lone pair hence all are bonding pairs leading to an ideal bond angle of 120.
In NO2+, the is no lone pair only bond pair exist thus leading a bond angle is 180.
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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