Central Exam — General Science — Chemistry
UPSC · SSC · Bank · Railway · NDA — Central Government Exam MCQ Practice
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Q.1
Easy
Chemistry
Which of the following elements has the highest electronegativity value on the Pauling scale?
Correct Answer:
A. Fluorine
Explanation:
Fluorine has the highest electronegativity value of 3.98 on the Pauling scale, making it the most electronegative element.
This is because it has the smallest atomic radius and the highest effective nuclear charge among all elements, causing it to attract electrons most strongly in a chemical bond.
Q.2
Easy
Chemistry
Chemical formula of water?
Correct Answer:
B. H2O
Explanation:
Water = H₂O.
Q.3
Easy
Chemistry
Atomic number of Carbon?
Correct Answer:
A. 6
Explanation:
Carbon atomic number = 6.
Q.4
Easy
Chemistry
Liquid to gas process?
Correct Answer:
C. Evaporation
Explanation:
Evaporation = liquid to gas.
Q.5
Easy
Chemistry
Hardest natural substance?
Correct Answer:
C. Diamond
Explanation:
Diamond = 10 on Mohs scale.