Blue litmus turns red in a solution. The solution is likely:
A. Neutral
B. Acidic
C. Basic
D. Saline
Answer: Option B
Solution (By JKExamLibrary)
Acids turn blue litmus red; bases turn red litmus blue. Litmus is a purple dye extracted from lichens, used as an indicator. pH < 4.5 red, > 8.3 blue, intermediate purple. Neutral solution (pH 7) does not change the color of litmus significantly. This is a simple test for acid-base nature.
Explanation:
Baking powder = sodium bicarbonate + weak solid acid (usually tartaric acid or cream of tartar). On moistening, they react to produce CO₂, causing dough to rise without requiring external acidic ingredient.
Explanation:
The quantum numbers n=3 and l=1 specify the 3p subshell. The magnetic quantum number m=-1 specifies one particular 3p orbital within that subshell. According to Pauli's Exclusion Principle, a single orbital can accommodate a maximum of two electrons, which must have opposite spins (+1/2 and -1/2).
Explanation:
Roasting converts sulfide ores to oxides by heating in excess air: 2ZnS + 3O₂ → 2ZnO + 2SO₂. Calcination is for carbonates; leaching for others.
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