Boron has two stable isotopes, ¹°B(19%) and ¹¹B(81%). Average atomic weight for boron in the periodic table is
Options
(a) 10.8 (b) 10.2 (c) 11.2 (d) 10
Correct Answer:
10.8
Explanation:
Avg Atomic […]
1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is
Options
(a) 1.52 (b) 0.995 (c) 190 (d) 9
Correct Answer:
9
Explanation:
One […]
If principal quantum number n=4, the total number of orbitals having l=3 is
Options
(a) 3 (b) 7 (c) 5 (d) 9
Correct Answer:
7
Explanation:
For n= 4, /= 3 (f-subshell) no. […]
At S.T.P the density of CCl₄ vapours in g/L will be nearest to
Options
(a) 6.87 (b) 3.42 (c) 10.26 (d) 4.57
Correct Answer:
6.87
Explanation:
Molecular Weight of CCl₄ = 35.5 + […]
Maximum number of H-bonds in one molecule of water is
Options
(a) 1 (b) 2 (c) 3 (d) 4
Correct Answer:
4
Explanation:
No explanation available. Be the first to write the explanation […]
In the final answer of the expression (29.2 – 20.2) (1.79 x 10⁵) / 1.37. The number of significant figures is
Options
(a) 1 (b) 2 (c) 3 (d) 4
Correct Answer:
3
Explanation: […]
What is the maximum number of electrons that can be associated with the following set of quantum numbers? n=3, l=1 and m=–1
Options
(a) 6 (b) 4 (c) 2 (d) 10
Correct Answer: […]
0.45 g acid of molecular weight 90 was neutralise by 20 mL of 0.5 N KOH. The basicity of acid is
Options
(a) 2 (b) 4 (c) 1 (d) 3
Correct Answer:
2
Explanation: […]
Number of unpaired electrons in N2⁺ is
Options
(a) 2 (b) 0 (c) 1 (d) 3
Correct Answer:
1
Explanation:
N(7) = 1s²2s²2p² N2⁺ = 1s², 2s², 2p unpaired electrons =1
The number of nodal planes in pₓ is
Options
(a) 1 (b) 2 (c) 3 (d) 0
Correct Answer:
1
Explanation:
The number of nodal plane are present in a px is one […]
2017 Copyright Doctor Dreams Training Academy