set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on inorganic chemistry topic of general science mcq
- The discovery of inert gases later on did not disturb Mendeleev’s arrangement.
- In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations.
(a) 1 and 2 both
(b) 2 only
(c) 1 only
(d) None
The correct answers to the above question in:
Answer: (a)
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Question : 1
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I | List-II |
A. Limestone | 1. Cement |
B. Copper | 2. Electrical goods |
C. Bauxite | 3. Manufacture of aeroplanes |
D. Manganese | 4. Steel |
a) 4 3 2 1
b) 2 3 1 4
c) 1 2 3 4
d) 3 4 1 2
Answer »Answer: (c)
Manganese is essential to iron and steel production. At present, steel making accounts for 85 to 90% of the total demand, most of the total demand. Manganese is a key component of low-cost stainless steel formulations and certain widely used aluminium alloys.
Limestone can be used in constructing buildings. It can be used for making cement and mortar. Limestone is used to make glass and even used to make roads.
Bauxite is the mineral ore of aluminium which is used in the manufacture of cans, aeroplanes, sporting and electronic equipment and home appliances.
The Wright Brother’s first aeroplane to fly in 1903 only was able to get off the ground because they modified its engine with aluminium in order to reduce its weight. Without the ability of the strong aluminium, alloys to withstand the huge pressures and stresses involved, high-altitude flying would not be conceivable. In fact, aluminium comprises about 80% of an aircraft’s unladen weight.
The element copper is used extensively as an electrical conductor, for the making of electrical wire.
Question : 2
In the manufacture of lead glass:
- Oxide of lead is added to ordinary glass
- Oxide of lead increases the density of glass
- Oxide of lead increases the refractive index of glass
- Oxide of lead decreases the refractive index of glass
a) 1, 3 and 4
b) 2, 3 and 4
c) 1, 2 and 4
d) 1, 2 and 3
Answer »Answer: (d)
Question : 3
Match List-I with List-II :
List-I | List-II |
A. German silver | 1. Tin |
B. Solder | 2. Nickel |
C. Bleaching powder | 3. Sodium |
D. Hypo | 4. Chlorine |
a) 1 2 3 4
b) 2 1 3 4
c) 1 2 4 3
d) 2 1 4 3
Answer »Answer: (d)
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc.
Solders are typically made from tin or lead or a combination of both in the ratio of 63:37 respectively.
Calcium hypochlorite, also known as bleaching powder, is a chemical compound with the formula Ca(ClO)2. It is widely used for water treatment and as a bleaching agent. This chemical is considered to be relatively stable and has greater available chlorine than sodium hypochlorite (liquid bleach).
Hypo solution is the abbreviation for sodium thiosulphate or sodium hyposulphite, a chemical used to fix the image on photographic film after it has been developed.
Question : 4
Consider the following statements :
- Metals can form positive ions by losing electrons to non-metals.
- Different metals have same reactivities with water and dilute acids.
- A more reactive metal displaces a less reactive metal from its salt solution.
a) 2 and 3
b) 1 and 3
c) 1 and 2
d) 1, 2 and 3
Answer »Answer: (b)
Question : 5
Which one of the following is present in the largest amount in terms of percent by mass in the Earth’s crust?
a) Silicon
b) Carbon
c) Oxygen
d) Calcium
Answer »Answer: (c)
Question : 6
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I | List-II |
A. KNO3 | 1. Nitric acid, Silver hydroxide |
B. AgNO3 | 2. Hydrochloric acid, Magnesium hydroxide |
C. MgCl2 | 3. Carbonic acid, Ammonium hydroxide |
D. (NH4)2CO3 | 4. Nitric acid, Potassium hydroxide |
E. NaCl | 5. Hydrochloric acid, Sodium 5ydoxide |
a) A → (4); B → (3); C → (1); D → (2); E → (5)
b) A → (1); B → (2); C → (4); D → (3); E → (5)
c) A → (4); B → (3); C → (2); D → (1); E → (5)
d) A → (4); B → (1); C → (2); D → (3); E → (5)
Answer »Answer: (d)
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