set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on classification of elements, chemical bonding, periodicity in properties & physical transformation topic of general science mcq
(a) number of valence electrons
(b) chemical properties
(c) valence
(d) All of these
The correct answers to the above question in:
Answer: (d)
Because of the presence of same number of valence electrons the elements of same group have similar chemical properties.
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Question : 1
An element ‘M’ has an atomic number 9 and its atomic mass 19. The ion of M will be represented by
a) M2+
b) M–
c) M
d) M2–
Answer »Answer: (b)
The electronic configuration of M is 2, 7.
It needs one electron to complete its octet. It has a strong tendency to gain 1 electron and so its ion will be M–.
Question : 2
In the reaction 4Fe + 3O2 → 4Fe3+ + 6O 2−
Which of the following statements is incorrect?
a) Metallic iron acts as a reducing agent
b) $O_2$ acts as an oxidising agent
c) It is a redox reaction
d) Metallic iron is reduced to F$e^{3+}$
Answer »Answer: (d)
Question : 3
Which scientist came up with the concept of a periodic table that included all of the known elements?
a) Dmitri Mendeleev
b) Antoine Lavoisier
c) Joseph Priestly
d) Albert Einstein
Answer »Answer: (a)
Dmitri Mendeleev is credited with designing the modern periodic table. Joseph Priestly and Antoine Lavoisier were both chemists. Albert Einstein developed theories on photoelectric effect.
Question : 4
Match List-I with List-II:
List-I | List-II |
A. $C + O_2 ⟶ CO_2$ | 1. Displacement |
B. $2AgBr ⟶ ↖ {Light} 2Ag+Br_2$ | 2. Combination |
C. Zn + $CuSO_4 ⟶ ZnSO_4 + Cu$ | 3. Decomposition |
D. $2Ca + O_2 ⟶ 2CaO$ | 4. Oxidation |
E. $BaCl_2 + H_2SO_4 ⟶ BaSO_4 + 2HCl$ | 5. Double displacement reaction |
a) A – (2), B – (3), C – (4), D – (1), E – (5)
b) A – (3), B – (2), C – (1), D – (4), E – (5)
c) A – (2), B – (3), C – (1), D – (4), E – (5)
d) A – (2), B – (3), C – (1), D – (5), E – (4)
Answer »Answer: (c)
Question : 5
The metal which is hard and has high m.p. and used in electric bulbs is
a) Pt
b) Fe
c) Ni
d) W
Answer »Answer: (d)
Tungsten (W) is used in electric bulbs.
Question : 6
Consider the following equation for the formation of ammonia from nitrogen and hydrogen:
N2 + 3H2 = 2NH3
How many hydrogen molecules are required to react with 100 molecules of nitrogen?
a) 200
b) 300
c) 100
d) 400
Answer »Answer: (b)
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