The number of gram molecules of oxygen in 6.02 x 10²⁴ CO molecules is
The number of gram molecules of oxygen in 6.02 x 10²⁴ CO molecules is
Options
(a) 10 gm molecules (b) 5 gm molecules (c) 1 gm molecules (d) 0.5 gm molecules
Correct Answer: […]
Easy
The order of filling of electrons inthe orbitals of an atom will be
The order of filling of electrons inthe orbitals of an atom will be
Options
(a) 3d, 4s, 4p, 4d, 5s (b) 4s, 3d, 4p, 5s, 4d (c) 5s, 4p, 3d, 4d, 5s (d) […]
The maximum number of electrons in a subshell is given by the expression
The maximum number of electrons in a subshell is given by the expression
Options
(a) 4l– 2 (b) 4l+ 2 (c) 2l+ 2 (d) 2n²
Correct Answer:
4l+2
Explanation:
No. of orbitals in […]
Maximum number of electrons in a subshell of an atom is determined
Maximum number of electrons in a subshell of an atom is determined by the following:
Options
(a) 2l + 1 (b) 4l – 2 (c) 2n² (d) 4l + 2
Correct Answer:
4l + […]
The weight of iron which will be converted into its oxide(Fe₃O₄) by the action of 18g
The weight of iron which will be converted into its oxide(Fe₃O₄) by the action of 18 g of steam on it will be (at. wt. of Fe=56)
Options
(a) 168 g (b) 84 […]
The set of quantom number for 19th electrons of chromium(Z=24) is
The set of quantom number for 19th electrons of chromium(Z=24) is
Options
(a) 4,0,0,+½ (b) 4,1,-1,+½ (c) 3,2,2,+½ (d) 3,2,-2,+½
Correct Answer:
4,0,0,+½
Explanation:
(Z= 24) ≡ 1s²,2s²,2p⁶,3s²,3p⁶,4s¹,3d⁵ For 19th electron (i.e.,4s¹) n=4,n […]
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be
Options
(a) 3 mol (b) 4 mol […]
Mass of one atom of X is 2.66 x 10⁻²³ g, then its 32 g is equal to
Mass of one atom of X is 2.66 x 10⁻²³ g, then its 32 g is equal to
Options
(a) 32 x 2.66 x 10⁻²³ mol (b) 32 / (2.66 x 10⁻²³ x […]
The number of significant figures for the three numbers 161 cm, 0.161 cm
The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
Options
(a) 3,4,5 respectively (b) 3,4,4 respectively (c) 3,3,4 respectively (d) 3,3,3 respectively
Correct Answer:
3,3,3 respectively
Which pair of atomic numbers represents s-block elements?
Which pair of atomic numbers represents s-block elements?
Options
(a) 3,12 (b) 6,12 (c) 7,15 (d) 9,17
Correct Answer:
3,12
Explanation:
Last electron goes to s-subshell.