Question

What urged Shri Venkatesh B. Ketkar to propose the existence of more planets outside Neptune’s orbit?

A. He observed them through a telescope
B. He knew astrology which predicted existence of unknown objects
C. He made mathematical calculations based on gravitational pull of orbit of Neptune
D. He was informed about such planets by French scientists​

Answer 1

Answer:

option d.

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.

Explanation:

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