The reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe is an example of:
A. Combination
B. Displacement
C. Decomposition
D. Double displacement
Answer: Option B
Solution (By JKSSB Mock Tests)
Aluminium displaces iron from iron(III) oxide because Al is more reactive. This is a single displacement (or thermite) reaction. Also redox: Al oxidized, Fe reduced. Combination: one product; decomposition: one reactant.
Explanation:
Detergents emulsify grease by forming micelles around oil droplets, removing them from fabric. Soap does same but less effective in hard water.
Explanation:
Methane (CH₄) is released from enteric fermentation in livestock (cattle) and from anaerobic decomposition in flooded rice paddies. It has a high global warming potential (25× CO₂ over 100 years). CO₂ mainly from fossil fuels. N₂O from fertilizers. CFCs from refrigerants. Agriculture contributes significantly to anthropogenic GHG emissions. Reducing methane can have rapid climate benefits.
Explanation:
In [Ni(CN)4]2-, Ni is in the +2 oxidation state (d8 configuration). CN- is a strong field ligand, causing the pairing of d-electrons. This leaves one empty d-orbital, leading to dsp2 hybridization. The geometry is square planar. Since all electrons are paired, the complex is diamagnetic.
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