34. NCERT Exemplar V

Exercise condition:

3 m.

1. Dalton’s atomic theory successfully explained

(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion

(i), (iii) and (iv)
(ii), (iii) and (iv)
(i), (ii) and (iv)
(i), (ii) and (iii)

2. Rutherford’s a-particle scattering experiment showed that

(i) Electrons have negative charge.
(ii) The mass and positive charge of the atom is concentrated in the nucleus.
(iii) Neutron exists in the nucleus.
(iv) Most of the space in atom is empty.

Which of the above statements are correct?

(i) and (iv)
(iii) and (iv)
(i) and (iii)
(ii) and (iv)

3. Elements with valency \(1\) are

either metals or non-metals
always metalloids
always non-metals
always metals

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