Which quantum divides shells into orbitals?
Spin
Principal
Azimuthal
Magnetic
Correct answer is C
The azimuthal quantum number determines an atom's orbital angular momentum and the shape of the orbital. The principal quantum number determines its number of shells. Magnetic quantum number determines how many orbitals there are as well as their orientation within a subshell.
The shapes of water, ammonia, carbon (iv) oxide and methane are respectively
linear, tetrahedral, angular and pyramidal
angular, pyramidal, linear and tetrahedral
pyramidal, linear, tetrahedral and angular
tetrahedral, angular, pyramidal and linear
Correct answer is B
Ammonia \((NH_3\)) has a trigonal pyramidal structure with a bond angle of approximately 107 degrees. Methane (\(CH_4\)) has a tetrahedral structure with a bond angle of 109.5 degrees. Carbon dioxide is a linear molecule, with a 180-degree bond angle. Water \((H_2O\)) has a bent or V-shaped structure with a bond angle of approximately 104.5 degrees.
electrolyte
electrodes
salt bridge
solid - liquid interface
Correct answer is C
No explanation has been provided for this answer.
Rate of backward reaction will increase
The equilibrium constant will shift
Rates of forward and backward reactions are not affected
Rate of forward reaction will increase
Correct answer is A
The given reaction is endothermic, hence, a decrease in temperature will favor the exothermic side which is the backward reaction.
The following are isoelectronic ions except
Na\(^+\)
Mg\(^{2+}\)
Si\(^{2+}\)
O\(^{2+}\)
Correct answer is C
Two or more ions are said to be isoelectronic if they have the same electronic structure and the same number of valence electrons.
Na\(^+\) = 10 electrons = 2, 8
Mg\(^{2+}\) = 10 electrons = 2,8
O\(^{2-}\) = 10 electrons = 2,8
Si\(^{2+}\) = 12 electrons = 2,8,2
\(\implies\) Si\(^{2+}\) is not isoelectronic with the rest.