set 3 MCQ Questions & Answers Detailed Explanation

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The following question based on acids, bases, salts and metals topic of general science mcq

Questions : Neutral water with pH about 7 becomes slightly acidic when aerated. This is because

(a) ultraviolet radiation dissociates water molecules and makes water acidic

(b) oxygen from air is dissolved in the water which makes the water acidic

(c) dirt, which get contaminated with the water during aeration makes the water acidic

(d) carbon-dioxide from air is dissolved

The correct answers to the above question in:

Answer: (d)

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Question : 1

Universal indicator solution is named as such because

a) it has a universal appearance

b) it can be used for entire pH range

c) it is available universally

d) all the above are correct

Answer: (b)

It can be for entire pH range.

Question : 2

Match Column-I with Column-II:

Column-I Column-II
A. Titanium P. Coinage metal
B. Palladium Q. Fuel
C. Uranium R. Catalyst
D. Platinum S. Strategic metal
Select the correct answer using the codes given below the list: Code (A) (B) (C) (D)

a) A – R; B – S; C – Q; D – P

b) A – S; B – R; C – Q; D – P

c) A – P; B – R; C – Q; D – S

d) A – S; B – Q; C – R; D – P

Answer: (b)

Question : 3

The reaction of metal with acid results in the formation of–

a) only salt

b) both salt and hydrogen gas

c) only hydrogen gas

d) none of these

Answer: (b)

e.g. Na + HCl ⟶ NaCl + $1/2H_2$

Question : 4

Acids are ____________ in taste while bases are ____________ in taste.

a) sweet, sour

b) sour, salty

c) sweet, salty

d) sour, bitter

Answer: (d)

All acids are sour in taste, like tartaric acid in tamarind and acetic acid in vinegar while all bases are bitter in taste like baking soda.

Question : 5

Arrange the following bases in increasing order of their, basic strength

  1. Sodium hydroxide
  2. Magnesium hydroxide.
  3. Aluminium hydroxide
  4. Ammonium hydroxide
Select the correct answer using the code given below Codes: A B C D

a) 4 3 2 1

b) 4 2 1 3

c) 4 1 2 3

d) 1 2 3 4

Answer: (a)

Question : 6

Match Column-I with Column-II:

Column-I (Alloy) Column-II (Composition of Elements)
A. Steel P. Cu and Sn
B. Brass Q. Cu and Zn
C. Bronze R. Fe, C and Cr
D. Magnalium S. Al and Mg
Select the correct answer using the codes given below the list: Code (A) (B) (C) (D)

a) A – Q; B – R; C – S; D – P

b) A – Q; B – R; C – P; D – S

c) A–R; B–Q; C–P; D–S

d) A – R; B – Q; C – S; D – P

Answer: (c)

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