Classification of Elements and Periodicity in Properties MCQ Questions & Answers in Inorganic Chemistry | Chemistry
Learn Classification of Elements and Periodicity in Properties MCQ questions & answers in Inorganic Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.
111.
Which of the following transitions will involve maximum amount of energy?
112.
In which of the following process highest energy is absorbed?
A
$$Cu \to C{u^ + }$$
B
$$Br \to B{r^ - }$$
C
$$I \to {I^ - }$$
D
$$Li \to L{i^ + }$$
Answer :
$$Cu \to C{u^ + }$$
$$Cu$$ has completely filled $$d$$ - orbital, so highest energy is absorbed when it converts to $$C{u^ + }\,ion.$$
113.
Which of the following ionisation energy values for calcium show a sudden increase ?
A
Third
B
Second
C
First
D
Fourth
Answer :
Third
$$\eqalign{
& Ca = 3{s^2}3{p^6}4{s^2} \cr
& C{a^{2 + }} = 3{s^2}3{p^6}4{s^0} \cr} $$
( Stable noble gas configuration )
Hence, there would be sudden increase in $$I{E_3}$$ value.
114.
The correct order of acidic strength is
A
$$C{l_2}{O_7} > S{O_2} > {P_4}{O_{10}}$$
B
$$C{O_2} > {N_2}{O_5} > S{O_3}$$
C
$$N{a_2}O > MgO > A{l_2}{O_3}$$
D
$${K_2}O > CaO > MgO$$
Answer :
$$C{l_2}{O_7} > S{O_2} > {P_4}{O_{10}}$$
Non-metallic oxides are acidic and acidic character decreases with increase in metallic character.
115.
Beryllium has higher ionisation enthalpy than boron. This can be explained as,
A
beryllium has higher size than boron hence its ionisation enthalpy is higher
B
penetration of $$2p$$ - electrons to the nucleus is more than the $$2s$$ - electrons
C
it is easier to remove electron from $$2p$$ - orbital as compared to $$2s$$ - orbital due to more penetration of $$s$$ - electrons
D
ionisation energy increases in a period
Answer :
it is easier to remove electron from $$2p$$ - orbital as compared to $$2s$$ - orbital due to more penetration of $$s$$ - electrons
No explanation is given for this question. Let's discuss the answer together.
116.
The first ionisation potential of $$Na,Mg,Al\,\,{\text{and}}\,\,Si$$ are in the order
A
$$Na < Mg > Al\, < \,Si$$
B
$$Na > Mg > Al\, > Si$$
C
$$Na < Mg < Al\, < Si$$
D
$$Na > Mg > Al\, < Si$$
Answer :
$$Na < Mg > Al\, < \,Si$$
NOTE : First ionisation potential increases from left to right in a period, But $$Mg$$ is more stable than $$Al$$ due to fully filled-$$3s$$ orbitals.
$$I{E_1}$$ of $$Mg$$ is higher than that of $$Na$$ because of
increased nuclear charge and also that of $$Al\,$$ because
in $$Mg$$ a $$3$$ $$s$$-electron has to be removed while in $$Al\,$$ it is
the $$3$$ $$p$$-electron. The $$I{E_1}$$ of $$Si\,$$ is, however, higher than those of $$Mg$$ and $$Al$$ because of its increased nuclear
charge. Thus, the overall order is $$Na < Mg > Al\, < \,Si$$
117.
An element $$\left( M \right)$$ of atomic weight 40 has 2, 8, 8, 2 as the electronic configuration. Which one of the following statements regarding this element is not correct?
A
It belongs to II group of the periodic table.
B
It has 20 neutrons.
C
The formula of its oxide is $$M{O_2}.$$
D
It belongs to 4th period of the periodic table.
Answer :
The formula of its oxide is $$M{O_2}.$$
No explanation is given for this question. Let's discuss the answer together.
118.
Which of the following elements has been discovered recently and is radioactive?
A
Indium
B
Livermorium
C
Rhodium
D
Technetium
Answer :
Livermorium
No explanation is given for this question. Let's discuss the answer together.
119.
Ionic radius in a group while moving down
A
remains same from top to bottom
B
decreases from top to bottom
C
increases from top to bottom
D
first increases and then decreases
Answer :
increases from top to bottom
Ionic radius in a group increases from top to bottom since one energy shell is added with each period.
120.
Which of the following series correctly represents relations between the elements from $$X$$ to $$Y?$$
$$X \to Y$$
A
$$_3Li{ \to _{19}}K$$ Ionization enthalpy increases
B
$$_9F{ \to _{35}}Br$$ Electron gain enthalpy ( negative sign ) increases
C
$$_6C{ \to _{32}}Ge$$ Atomic radii increases
D
$$_{18}Ar{ \to _{54}}Xe$$ Noble character increases