91) In an atom, when electron jump from ground state excited state
A) no change in energy
B) energy is emitted
C) energy is absorbed
D) depends on atom
92) The orbital which is filled with electrons immediately after '3p' is
93) When n = 4, the total number of subshells in an orbit is
94) Which of the following has larger wavelength in electromagnetic spectrum
A) Gamma rays
B) UV rays
C) X-rays
D) Radio waves
95) The quantum number which explains about the special orientation of orbitals is
1
96) The correct set of four quantum number values for the valence electron of sodium atom is
A) n=3,1=1,m=1,s=
B) n=3,1=0,m=0,s=
C) n=3,1=0,m=1,s=
D) n=3,1=1,m=0,s=
B) n=3,1=0,m=0,s=
Explanation:Sodium's valence electron: atomic number 11 → electron in 3s¹ ⇒n = 3, l = 0, m = 0, s = +½
Answer: n=3, l=0, m=0, s=+½
97) The impurities present in the ore is called as
A) Flux
B) Gangue
C) Slag
D) Mineral
98) Which of the following is used as a flux in the smelting of Haematite
A) SiO2
B) CaSiO3
C) CaCO3
D) FeSiO3
3
99) Potassium and Calcium belongs to
A) s-block elements
B) p-block elements
C) d-block elements
D) f-block elements
100) Which of the following is an ore of Iron
A) Bauxite
B) Haematite
C) Carnallite
D) Pyrolusite
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