Chemistry Class 9th

181-Electrons revolve around nucleus in circular paths , called

A) Orbit

B) Shell

C) Both a and b

182-The charge on an electron is

A) -1.602 × 1019 coulombs

B) 1.602 × 1011 coulombs

C) 1.602 × 1015 coulombs

183. Protons is -------times is heavier than electrons

A) 1850

B) 1837

C) 1819

184. The charge on an electron is

A) 1.602 × 1019 coulombs

B) 1.602 × 1011 coulombs

C) 1.602 × 1015 coulombs

185. The mass of proton is equal to

A) 1.0072766

B) 1.087654

C) 1.0987654

186- The mass of neutron is equal to

A) 1.0086654

B) 1.0072766

C) 1.6022

187. Neutron is_______ times heavier than proton

A) 1842

B) 1879

C) 1860

188-The arrangement of electons in orbits around the nucleus is called

A) Configuration

B) Electronic configuration

C) Both a and b

189- The first shell around a nucleus is called

A) K-shell

B) M-shell

C) L-shell

190-The number of electones in a particular orbit is given by formula

A) 2n

B) n

C) 2n2

191- The maximum no, of electrons in first shell is

A) 2

B) 8

C) 18

192- The maximum no, of electrons in 2nd shell is

A) 2

B) 8

C) 18

193- As the shell no. increases , the energy of electrons also

A) Increases

B) Decreases

C) Remains same

194- There are ------ sub-shells

A) 2

B) 3

C) 4

195- The sub-shells are represented by

A) K,L,M,N

B) s,p,d,f

C) Both a and b

196- Sub-shell s stands for

A) Super

B) Small

C) Sharp

197- Sub-shell p stands for

A) Prior

B) Principal

C) Both a and b

198-Sub-shell d stands for

A) Diffused

B) Principal

C) None of these

199- The maximum no, of electrons in 3rd shell is

A) 2

B) 8

C) 18

200- s sub-shell can accommodate maximum of ------- electrons

A) 2

B) 6

C) 10