Question
Which of the following sequences correctly represents
the electron affinity of the halogens?Solution
Electron affinity generally increases across a period and decreases down a group due to atomic size and electron-electron repulsion in smaller atoms. Among halogens, chlorine has a higher electron affinity than fluorine due to its larger size allowing easier addition of an electron, making the order I < Br < Cl < F.
Polycyclic Aromatic Hydrocarbons are formed during cooking from all of the following EXCEPT:
The total of the product cost plus the markup is:
What type of mouthparts are found in thrips?
A common example of a symbiotic non-legume nitrogen-fixing association is:
What is the ESP of saline-alkaline soils?
Which term describes uncoiling of buds in ferns?
The vitamin which can combine with free oxygen radicals and protect the integrity of the cell membranes is:
How much boron concentration (mg/kg) is unsafe for plant growth?
Maximum, minimum and optimum temperatures are collectively termed as
Leaves of oilseed crop is used for rearing silkworm is:
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