In these questions, there are four groups of letters, words or numbers listed as (a), (b), (c) and (d). One of the groups does not belong to the same category as others. Find the odd one out. Unscramble the letters in the given words and find the odd one out.

Question

When the first electron gain enthalpy $( \Delta_{eg}H) $ of oxygen is $-141\, kJ/mol$, its second electron gain enthalpy is :

Answer 1

A quicker check is to compare the letters in each scrambled group without even decoding the words fully.

UMRSME: 6 letters (U, M, R, S, M, E). This unscrambles to SUMMER, a season.
EIWNTR: 6 letters (E, I, W, N, T, R). This unscrambles to WINTER, a season.
PIGRSN: 6 letters (P, I, G, R, S, N). This unscrambles to SPRING, a season.
LCUOD: only 5 letters (L, C, U, O, D). This unscrambles to CLOUD, which is a weather term, not a season, and it is also the only group with a different letter count from the rest.

Both checks (the season category and the letter count) point to the same group. So LCUOD (CLOUD) is the odd one out. $\boxed{\text{LCUOD (CLOUD)}}$

Answer 2

A quicker check is to compare the letters in each scrambled group without even decoding the words fully.

UMRSME: 6 letters (U, M, R, S, M, E). This unscrambles to SUMMER, a season.
EIWNTR: 6 letters (E, I, W, N, T, R). This unscrambles to WINTER, a season.
PIGRSN: 6 letters (P, I, G, R, S, N). This unscrambles to SPRING, a season.
LCUOD: only 5 letters (L, C, U, O, D). This unscrambles to CLOUD, which is a weather term, not a season, and it is also the only group with a different letter count from the rest.

Both checks (the season category and the letter count) point to the same group. So LCUOD (CLOUD) is the odd one out. $\boxed{\text{LCUOD (CLOUD)}}$

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