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21. Sharing of valence electrons products a chemicals bond called
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. All the above
Explanation:
22. Number of elements essential for life is
A. 95
B. 45
C. 25
D. 14
Explanation:
23. The most abundant 6 elements found in living beings are
A. C, H, N, O, P and S
B. C, H, N, O, Ca and Na
C. C, H, O, K, Na and Mg
D. C, Ca, O, H, Mg and Mn
Explanation:
24. Which is not based on predictive generalization or repeatable experimentation?
A. Hypothesis
B. Theory
C. Principle
D. Law
Explanation:
25. Hydrogen bonds amongst water molecules have bestowed the property of
A. Liquid with ability to flow
B. High viscosity, high specific heat and high heat of vaporisation
C. High boiling point and low freezing point
D. All the above
Explanation:
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