Which of the following sets of quantum numbers is impossible?
A. n=2, l=1, m=-1, s=-1/2
B. n=1, l=0, m=0, s=+1/2
C. n=4, l=3, m=0, s=-1/2
D. n=3, l=2, m=-3, s=+1/2
Answer: Option D
Solution (By JKSSB Mock Tests)
The magnetic quantum number (m) can only take integer values ranging from -l to +l. For n=3, l can be 2 (a d-orbital). If l=2, the possible values for m are -2, -1, 0, +1, +2. The value m=-3 is outside this range, making this set of quantum numbers impossible.
Explanation:
A small amount of ethanol (alcohol) is added to chloroform to inhibit its oxidation by air to toxic phosgene (COCl₂) and HCl. Ethanol acts as a negative catalyst (stabilizer) by consuming any formed phosgene. MnO₂, Pt, Fe are positive catalysts. Negative catalysts are also called inhibitors, used to prevent undesirable reactions.
Explanation:
Methyl orange is red at pH < 3.1 and yellow at pH > 4.4. Litmus: red in acid, blue in base. Phenolphthalein: colorless in acid, pink in base. Turmeric: yellow in acid, reddish-brown in base.
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