Multiple Choice QuestionsAssertion : Diamond and graphite do not have the same crystal structure.
Reason : Diamond is crystalline while graphite is amorphous.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
C.
If assertion is true but reason is false.
In diamond, C-atoms are sp3 hybridized while in graphite, they are sp2 hybridized.
Living in the atmosphere of CO is dangerous, because it
combines with O, present inside to form CO2
reduces organic matter of tissues
combines with haemoglobin and makes it incapable to absorb oxygen
dries up the blood.
C.
combines with haemoglobin and makes it incapable to absorb oxygen
Carbon monoxide combines with haemoglobin of blood to form a complex called carboxy-haemoglobin. Formation of this complex makes the haemoglobin incapable of oxygen transport. Due to which there will be oxygen deficiency in the blood.
Assertion : Bohr model fails in case of multielectron pecies.
Reason : It does not mention electron-electron interactions.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion.
Bohr model does not explain the spectra of multi-electron atoms.
Assertion : In a pressure cooker, the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of pressure cooker, the water starts boiling again.
Reason: The impurities in water bring down its boiling point.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
C.
If assertion is true but reason is false.
In pressure cooker, water boils above 100°C. When the lid of cooker is opened, pressure is lowered so that boiling point decreases and water boils again.
For silicon which is not correct?
It is a type of silicate.
It is thermally unstable.
It is hydrophilic.
Repeating unit is R2SiO.
C.
It is hydrophilic.
Silicon is hydrophobic.
Assertion : O2 is paramagnetic.
Reason : It has one unpaired electron.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
C.
If assertion is true but reason is false.
Oxygen has two unpaired electrons. So it is paramagnetic.
If Si is doped with B,
n-type semiconductor is formed
p-type semiconductor is formed
insulator is formed
polymer is formed.
B.
p-type semiconductor is formed
Silicon belongs to group 14, it is doped with a group 13 element like B which contains only three valence electrons. The place where the fourth valence e is missing is called electron hole. Under the electric field, e holes moves toward the negatively charged plate, which implies that e- holes are positively charged, thus it is a p-type semiconductor.
Assertion : ClF3 has T-shape structure.
Reason : It has two lone pairs arranged at 180° angle.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
C.
If assertion is true but reason is false.
ClF3 (T-shape)
The lone pairs are at equatorial position (120° angle).
N-N bond length is minimum in
N2O
N2O3
N2O4
N2O5
A.
N2O
N-N bond lenght is minimum in N2O
| Compound | Structure |
| N2O |  |
| N2O3 |  |
| N2O4 |  |
| N2O5 |  |
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