set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on nature of matter and composition topic of general science mcq
(a) organic bio fertilizer
(b) inorganic fertilizer
(c) toxic substance
(d) synthetic fertilizer
The correct answers to the above question in:
Answer: (a)
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Read more nature of matter and composition Based General Science Questions and Answers
Question : 1
Which of the following is considered to be a pure substance?
a) Muddy water
b) Sodium chloride
c) Granite
d) Milk of magnesia
Answer »Answer: (b)
Sodium chloride being compound is a pure substance. Granite, muddy water and milk of magnesia all are mixtures.
Question : 2
At NTP, the least volume will be occupied by 15 g of which one of the following ?
a) $N_2$
b) N$H_3$
c) $O_2$
d) Ne
Answer »Answer: (a)
Question : 3
White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
a) The samples have variable compositions and are classified as metallic solutions.
b) The materials are heterogeneous mixtures and can be classified by their components
c) They are homogeneous mixtures and be classified as metallic alloys.
d) The samples are heterogeneous mixtures that can be separated using magnetic properties.
Answer »Answer: (c)
As they have uniform composition throughout they are considered a homogeneous mixture.
Both samples are a mixture of two metals (gold and palladium) and thus are alloys.
Question : 4
Kerosene is a mixture of
a) saturated hydrocarbons
b) aromatic hydrocarbons
c) aliphatic hydrocarbons
d) alicyclic hydrocarbons
Answer »Answer: (c)
Question : 5
Solutions with low concentrations of solutes are
a) solvents
b) dilute
c) concentrated
d) None of these
Answer »Answer: (b)
dilute solutions have low concentration of solid.
Question : 6
Two substances A and B when brought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. The substance C is
a) a mixture
b) an element
c) a compound
d) none of these.
Answer »Answer: (c)
C is a compund which is formed as a result of reaction between A and B.
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