Which of the following sets of quantum numbers violates the rules of quantum mechanics
Options
(a) n=3, l=2, ml=-3, ms=+1/2 (b) n=3, l=1, ml=-1, ms=-1/2 (c) n=4, l=0, ml=0, ms=+1/2 (d) n=3, l=2, […]
12 g of an alkaline earth metal gives 14.8 g of its nitride .Atomic weight of the metal is
Options
(a) 12 (b) 20 (c) 40 (d) 14.8
Correct Answer:
40
Explanation:
No […]
If glycerol is heated with oxalic acid at certain temperature,it gives an acid.The acid is
Options
(a) propionic acid (b) acetic acid (c) benzoic acid (d) formic acid
Correct Answer:
formic acid
Explanation: […]
If a 0.00001 M solution of HCl is diluted thousand folds the pH of the resulting solution is
Options
(a) 5 (b) 7 (c) 8 (d) 6.98
Correct Answer:
6.98
Explanation:
No explanation […]
40 mg of pure sodium peroxide is dissolved in 10L of distilled water. The pH of the solution is
Options
(a) 9 (b) 10 (c) 11 (d) 12
Correct Answer:
10
Explanation:
No […]
If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to
Options
(a) 4P (b) 2P (c) P (d) 3P
Correct Answer:
P
Explanation: […]
The interatomic distances in H₂ and Cl molecules are 74 and 198 pm respectively. The bond length of HCl is
Options
(a) 124 pm (b) 248 pm (c) 272 pm (d) 136 pm
After tow hours, the ratioactive substance becomes 1/16th of original amount. Then the half -life (in min) is
Options
(a) 60 min (b) 120 min (c) 30 min (d) 15 min
Correct Answer: […]
The wavelength of the radiation emitted when an electron drops from 3rd orbit to 2nd orbit in H – atom will be nearly
Options
(a) 3300 A⁰ (b) 6600 A⁰ (c) 9900 A⁰ […]
When 4g of iron is burnt to ferric oxide at constant pressure, 29.28 kJ of heat is evolved. What is the enthalphy of formation of ferric oxide? (At. Wt of Fe=56)
Options
(a) […]
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