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
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$e^{3+}$
The correct answers to the above question in:
Answer: (d)
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Read more chemistry Based General Science Questions and Answers
Question : 1
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 : 2
Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists :
List-I (Oxidation number) | List-II (The elements) |
A. 2 | 1. Oxidation number of Mn in Mn$O_2$ |
B. 3 | 2. Oxidation number of S in $H_2S_2O_7$ |
C. 4 | 3. Oxidation number of Ca in CaO |
D. 6 | 4. Oxidation number of Al in NaAl$H_4$ |
a) A-4; B-3; C-1; D-2
b) A-3; B-4; C-2; D-1
c) A-3; B-4; C-1; D-2
d) A-4; B-3; C-2; D-1
Answer »Answer: (c)
Question : 3
Give a thought to these statements.
Statement (A):
Temperature below 0ºC is achieved by the mixture of salt and ice.
Reason (R):
Salt increases the freezing point of ice.
In the context of above statements which one of the following is correct?
a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (b)
Question : 4
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 : 5
All the members in a group in long form of periodic table have the same
a) number of valence electrons
b) chemical properties
c) valence
d) All of these
Answer »Answer: (d)
Because of the presence of same number of valence electrons the elements of same group have similar chemical properties.
Question : 6
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)
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