Chapter 1: Periodic classification of elements and periodicity
In this article, the author has explained the most important chemistry MCQs from the first chapter( periodic classification of elements and periodicity ) of FSC 2nd year chemistry. All the correct answers have been bold.
1: Which of the following elements react with steam only?
a) Na
b) Mg
c) K
d) Ca
2: Which of the following has the smallest size?
a) Al
b) Al+
c) Al++
d) Al+++
3: Which of the following set of elements is not transition elements?
a) Ti, Zn, Hf
b) Cu, Ag, Au
c) Ga, In, Tl
d) Ni, Pt, Pd
4: Which of the following is the strongest base?
a) NH3
b) PH3
c) AsH3
d) SbH3
5: Which pair of atomic numbers represent s-block elements?
a) 7, 15
b) 6, 12
c) 9, 17
d) 3, 12
6: 6th period contains transition elements
a) 2
b) 8
c) 16
d) 24
7: Which of the following is not amphoteric oxide?
A) Al2O3
b) PbO
c) ZnO
d) SO2
8: Which of the following elements burns in air to form an oxide which on shaking with H2O gives a solution having pH greater than?
a) carbon
b) Magnesium
c) Sulfur
d) Hydrogen
9: Which of the following properties increases upto the middle of the period and then decreases?
a) Ionization energy
b) Atomic radii
c) Melting and Boiling point
d) Atomic volume
10: When an element M reacts with chlorine, an acidic chloride is formed. What is element M?
a) Hydrogen
b) Sodium
c) Potassium
d) Calcium
11: ionic hydrides react with water to form:
a) Proton
b) Hydride ion
c) Hydroxide ion
d) Hydronium ion
12: Which of the following has the highest melting point?
a) NaCl
b) KCl
c) RbCl
d) CsCl
13: CH4 is a hydride
a) Acidic
b) Basic
c) Amphoteric
d) Neutral
14: Aluminum iodide has a nature
a) Ionic
b) Covalent
c) Polymeric
d) None
15: Which of the following is less basic?
a) MnO
b) MnO2
c) Mn2O3
d) Mn2O7
16: 7th period of the periodic table contains normal elements
a) 2
b) 3
c) 4
d) 8
17: Periodic table has been dived into four blocks, which block contains the highest elements?
a) s
b) P
c) d
d) f
18: The division of elements into blocks in the modern periodic table is based on
a) Shell
b) Sub-shell
c) Both
d) None
19: Keeping in view the size of the atom, which order is the correct one
a) Mg > Sr
b) Ba > Mg
c) Lu > Ce
d) Cl > I
20: Mosley concluded by the X-ray studies of the elements that physical and chemical properties of elements depend upon:
a) Atomic mass
b) Atomic Number
c) Mass Number
d) All
21: Which one of the following is not ionic hydride
a) CsH
b) LiH
c) HCl
d) NaH
22: The element with the highest first ionization energy is
a) B
b) C
c) O
d) N
23: Mark the correct statement
a) Na+ is smaller than Na
b) Na+ is larger than Na
c) Cl– is smaller than Cl
d) Cl– ion and Cl are equal
24: The element with atomic number 9 is closest in chemical properties with element of atomic number
a) 27
b) 11
c) 17
d) 8
25: Period six in periodic table contain which block elements
a) s, p
b) s, p, d
c) s, p, f
d) s, p, d, f
26: Who introduced the zero group
a) Lother Mayer
b) Mendeleev
c) Ramsay
d) Mosley
27: Elements of group II-B are called
a) Representative elements
b) Transition elements
c) Non-typical transition elements
d) Coinage metal group
28: The elements with lowest Melting point
a) Be
b) Mg
c) Cd
d) Cr
29: Which of the following sets of atoms are arranged in order of decreasing electronegativity?
a) N, O, F
b) Si, P, S
c) F, O, N
d) S, Si, P
30: When hydrogen loses its electron to form H+ ion then it resembles
a) Transition metals
b) Halogen
c) Alkali metals
d) Noble gas
31: Which of the halides show a bridge-type structure
a) NaCl
b) AlCl3
c) CCl4
d) H2O
32: Which element of the following shows max, oxidation state:
a) P
b) S
c) Mn
d) Cr
33: The melting point is highest for the elements of group
a) IA
b) IIA
c) IIIA
d) IVA
34: Amphoteric oxide is formed by
a) ca
b) Fe
c) Cu
d) Zn
35: In the long form of the periodic table, the most electropositive elements occupy
a) Bottom right position
b) Bottom left position
c) Top right position
d) Top left position
36: Which of the following is the strongest reducing agent?
a) Cl–
b) Ar
c) K+
d) Ca+2
37: Which of the following elements will form the largest ion with noble gas electronic configuration?
a) Aluminum
b) Potassium
c) Phosphorous
d) Sulfur
38: Which of the following oxides has a molecular structure as distinct from a giant structure?
a) Na2O
b) MgO
c) SiO2
d) Cl2O7
39: Which of the following will produce the strongest acid when treated with H2O?
a) SO2
b) P2O5
c) Cl2O7
d) SiO2
40: Which of the following element has oxide with a giant structure and chloride which is readily hydrolyzed?
a) Ba
b) Na
c) Si
d) P
41: Which of the following oxides is unlikely to dissolve an aqueous NaOH?
a) Al2O3
b) MgO
c) SiO2
d) SO2
42: In which of the following pairs, the radius of the second atom is greater than the first?
a) Na, Mg
b) Sr, Ca
c) P, N
d) Cl, Br
43: An element Z has a low proton number. It forms an amphoteric oxide and a chloride which is readily hydrolyzed by water. Which group contains Z?
a) II
b) III
c) IV
d) V