set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on acids, bases, salts and metals topic of general science mcq
- Sodium hydroxide
- Magnesium hydroxide.
- Aluminium hydroxide
- Ammonium hydroxide
(a) 4 3 2 1
(b) 4 2 1 3
(c) 4 1 2 3
(d) 1 2 3 4
The correct answers to the above question in:
Answer: (a)
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Question : 1
Acids are ____________ in taste while bases are ____________ in taste.
a) sweet, sour
b) sour, salty
c) sweet, salty
d) sour, bitter
Answer »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 : 2
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
Answer »Answer: (d)
Question : 3
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 »Answer: (b)
It can be for entire pH range.
Question : 4
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 |
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 »Answer: (c)
Question : 5
Which is not a Lewis acid?
a) $BF_3$
b) $NH_3$
c) $AlCl_3$
d) $FeCl_3$
Answer »Answer: (b)
Question : 6
When the stopper of a bottle containing colourless liquid was removed, the bottle gave smell like that of vinegar. The liquid in the bottle could be
a) sodium hydroxide solution
b) acetic acid solution
c) hydrochloric acid
d) saturated sodium hydrogen carbonate solution
Answer »Answer: (b)
acetic acid solutions
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