CBSE
Multiple Choice QuestionsAssertion : Diamagnetic substances are not attracted by magnetic field.
Reason : Diamagnetic substances have no unpaired electrons.
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
Assertion : C- - H bond angle is less than the normal tetrahedral bond angle.
Reason : Lone pair-lone pair repulsion decreases bond 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.
Which one have the highest melting point ?
CsCl
NH3
He
CHCl3
Which is correct regarding size of atom?
N < O
B < Ne
V > Ti
Na > K
NF3 and BF3 both are covalent , but BF3 is non-polar, while NF3 is polar because :
boron is non-metal in free state , while N2 is gas
there is no dipole moment in B-F bond while N-F bond have some dipole moment
BF3 is planar while NF, is pyramidal
boron atom is smaller than nitrogen atom
Number of lone pair in XeOF4 is :
zero
one
two
three
The number of (sigma) and (pi) bonds in 1-buene-3-yne is :
5 , 5
8 , 6
7 , 3
6 , 4
The compound with maximum covalent character is :
AlCl3
AlI3
AgI2
NaI
The geemetry of the compound of sp3d hybridisation is :
pyramidal
triangular
planar
trigonal bipyramidal
The geometry of ammonia is :
tetrahedral
pyramidal
triangular
trigonal bipyrarnidal
