1) caste discrimination
2) child labor
3) sex discrimination
4) poverty
5) child marriage
6) sanitation
7) corruption
8) religious violence

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if u more then terrorism, dowry system, educational inequalities can also be added
i have not added it because it is banned except educational inequalities
ok... then u can write- prostitution,drug abuse, domestic violence, poverty,female infanticide, human trafficking
all these are applicable now a days mostly
Some present  social problems are environmental pollutions, wars, untouchable, bulling etc..  i hope it helps
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