12th class (Fsc) Chemistry unit 1 MCQs
101. Smaller the size of an ion:
a. Greater is die electron affinity
b. Lesser the degree of hydration
c. Greater is the degree of hydration
d. Lesser is the polarizing power
102. Which one of the following has highest hydration energy?
a. Mg
b. Na
c. Lr++
d. Ca
103. Which one of the following elements form polymeric energy?
a. Al
b. Be
c. Ga
d. All of these
104. The hybrides of group I-A are:
a. Metallic
b. Ionic
c. Interstitial
d. Covalent
105. Which one is ionic hybride?
a. NH3
b. NaH
c. CH4
d. AIH2
106. The highest boiling point in group IVA hybrides is that of:
a. GeH4
b. CH4
c. SnH4
d. SiH4
107. The oxides of electropositive elements are:
a. Amphoteric
b. Acidic
c. Neutral
d. Basic
108. Zinc oxide is:
a. Acidic
b. Basic
c. Neutral
d. Amphoteric
109. Maximum non affinity values of N are:
a. 3
b. 1
c. 2
d. None
110. The radius of f ion is:
a. 99pm
b. 72pm
c. 181pm
d. 136pm
111. Keeping in view the size of atoms, which order is the correct:
a. Lu>Ce
b. Mg>Sr
c. CI>I
d. Ba>Mg
112. Carbon exists as allotropes, which are different crystaline or molecular forms of the same substance. Graphite and diamond are allotropes of carbon. Diamond is a non-conductor whereas graphite is a good conductor because.
a. In graphite one of valence electron is free to move
b. Graphite has a layered structure
c. Graphite is soft and greasy bound
d. In graphite, all valence electrons are tetrahedrally bound
113. The diagram below is a plot of melting points of elements of second period agair their atomic numbers. Lithium and fluorine are placed at the extreme ends of the on the basis of melting points where will you place carbon among the empty on the
plot?
a. 4
b. 1
c. 3
d. 2
114. Which one remains same along a period?
a. Number of shells
b. Atomic radius
c. Electrical conductivity
d. Melting point
115. More the ionization energy ofan element:
a. More the reducing power
b. More the electropositivity
c. Bigger the atomic radius
d. Less the metallic character
116. What is the trend of melting and boiling point of the elements of short periods as we move from left to right in a periodic table?
a. Melting and boiling points first increase then decrease
b. Melting and boiling points first decrease then increase
c. Melting and boiling points decrease gradually
d. Melting and boiling points increase gradually
117. Along a period, atomic radius deceases, This gradual decreases in radius is due to:
a. Decrease in number of shells
b. Increase in number of electrons in valence shells
c. Increase in number of shells
d. Increase in number of protons in the nucleus
118. The trend in melting points of the elements of 3rd period, are depicted in figure below. the sharp decrease observed from Si to P is due to:
a. Different universities of two elements
b. Decrease in atomic radius from Si to P
c. Increase in electron density from Si to P
d. Change in bonding and structure of two elements
119. Arrange the following elements according to the trend of ionization energies.
a. B<C<N<Na
b. Ne<N<C<B
c. Ne<B<C<N
d. B<N<C<Na
120. which one of the foil:
a. Mg+2
b. Al-3
c. Na+1
d. Sl-4
121. Keeping in view the size of atoms, which order is correct?
a. Ar>a
b. N>C
c. Li>Be
d. P>Si
122. Melting point of group II-A elements are higher then those of group I-A because:
a. Atoms of II-A elements provides two binding electrons
b. Atoms of II-A elements have smaller size
c. I-A elements have smaller atomic radius
d. II-A elements are more reactive
123. The ionic radius of fluoride ion is:
a. 136 pm
b. 72 pm
c. 157 pm
d. 95 pm
Click here to go directly on chapter no.2