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801. Two or more forms of a chemical element having different physical properties but rising to identical chemical compounds are called :
A. Allotropes
B. Isotopes
C. Isomers
D. Isotones
Explanation:
802. Atoms of an element differ from those of all other elements
A. atomic number and electronic configuration
B. atomic number and number of valence electrons
C. number of neutrons and electronic configuration
D. number of neutrons and number of valence electrons
Explanation:
803. Which one of the following is a mixture ?
A. Lime
B. Table salt
C. Sugar
D. Sea water
Explanation:
804. The mass of the body is different from its weight because
A. mass varies very little at different places, whereas weight varies a lot
B. mass is a variable quantity, whereas weight is constant
C. mass is a measure if the quantity of matter, whereas weight is a force
D. mass is comstant but weight increases as the body moves from the Poles to the Equator
Explanation:
805. Which of the following groups of scientists provided experimental proof to the abiotic origin of life ?
A. Lamarck and Darwin
B. Miller and Urey
C. Oparin and Haldande
D. Weismann and Lamarck
Explanation:
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