Question

1. which one of the following is not the property of carbon
(a) tetravalency
(b) isomeism
(c) catenation
(d) pentavalency

2. The powet of a concave lens of focal length 2m is _____

3. S.I Unit of power lens is
(a) ampere
(b) joule
(c) Dioptre
(d) Newton metre​

Answer 1

Answer:

1.a tetravalency

2.-0.5dioptre

3.c dioptre

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