Set of isoelectronic species is
Options
(a) N₂,CO₂,CN⁻,O (b) N, H₂S, CO (c) N₂,CO,CN⁻,O₂⁺² (d) Cl,Mg,Ca
Correct Answer:
N₂,CO,CN⁻,O₂⁺²
Explanation:
Isoelectronic means equal electric, which means the atom or group have the same number […]
Which of the following is non-permissible?
Options
(a) n=4, l=3, m=0 (b) n=4, l=2, m=1 (c) n=4, l=4, m=1 (d) n=4, l=0, m=0
Correct Answer:
n=4, l=4, m=1
Explanation:
No explanation available. Be […]
For which one of the following sets of four quantum numbers, an electron will have the highest energy?n=3, l=2, m=1, s=1/2
Options
(a) n=4, l=2, m=-1, s=1/2 (b) n=4, l=1, m=0, s=-1/2 (c) […]
Which of the following sets has strongest tendency to form anions ?
Options
(a) Ga, In, Tl (b) Na, Mg, Al (c) N, O, F (d) V,Cr, Mn
Correct Answer:
N, O, F
Which of the following is not permissible arrangement of electrons in an atom?
Options
(a) n = 5, l = 3, m = 0, s = +1/2 (b) n = 3, l= 2, […]
Which one of the following ions will be the smallest in size?
Options
(a) Na⁺ (b) Mg²⁺ (c) F⁻ (d) O₂⁻
Correct Answer:
Mg²⁺
Explanation:
Greater is the positive charge on atom, large […]
Which of the following pairs has both members from the same group of periodic table?
Options
(a) Mg-Ba (b) Mg-Cu (c) Mg-K (d) Mg-Na
Correct Answer:
Mg-Ba
Explanation:
Mg—Ba; both belongs to II […]
The orientation of an atomic orbital is governed by
Options
(a) Spin quantum number (b) Magnetic quantum number (c) Principal quantum number (d) Azimuthal quantum number
Correct Answer:
Magnetic quantum number
Explanation:
Magnetic […]
When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of molecule
Options
(a) equal to that of separate atoms (b) lower than that of separate atoms (c) […]
Alkali metals in each period have
Options
(a) smallest size (b) lower ionisation potential (c) highest ionisation potential (d) highest electronegativity
Correct Answer:
lower ionisation potential
Explanation:
Alkali metals have lowest ionisation potential […]
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