Which metal is the most reactive among the following?
A. Zn
B. Na
C. Fe
D. Cu
Answer: Option B
Solution (By JKSSB Mock Tests)
Reactivity series order: Na > Zn > Fe > Cu. Sodium (alkali metal) is extremely reactive, reacting violently with water. Copper is low in the series, hence used for water pipes.
Explanation:
Ethene (C₂H₄) adds Br₂ across the double bond to form 1,2-dibromoethane. Bromine water decolorizes, a test for unsaturation. Alkanes undergo substitution.
Explanation:
Atomic number 12 = magnesium (Mg). Electronic configuration 2,8,2. It belongs to Group 2, Period 3. Sodium is 11, aluminium 13, potassium 19.
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