25 verified questions · ~23 minutes · answer key checked against the official NTA final key across multiple sources. Text-only questions (diagram-based excluded until they can be shown properly).
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A' × 10¹² hertz and that has a radiant intensity in that direction of 1/'B' watt per steradian. 'A' and 'B' are respectively
The correct increasing order for bond angles among BF₃, PF₃ and ClF₃ is :
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