CBSE
Multiple Choice QuestionsWhich of the following element is a metalloid ?
Bi
Sn
Ge
C
Dominance of strong repulsive forces among the molecules of the gas (Z = compressibility factor)
depends on Z and indicated by Z = 1
depends on Z and indicated by Z > 1
depends on Z and indicated by Z < 1
is independent of Z.
Assertion : The position of an element in periodic table after emission of one α and two β-particles remains unchanged.
Reason : Emission of one α and two β-particles give isotope of the element which acquires same position in periodic table.
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.
Element having maximum affinity is :
F2
Cl2
Br2
I2
Which among the following elements have lowest value of IE1 ?
Pb
Sn
Si
C
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular
The first ionisation potential is maximum for :
B
N
O
Be
Which of the following elements never show positive oxidation number ?
O
Fe
Ga
F
Element having maximum ionization energy :
Na
Li
K
Rb
Hydrogen in respect to chlorine, is :
electropositive
electronegative
neutral
none of the above
