The accused girl later allegedly tried to commit suicide, fearing police inquiry into the incident, and was stated to be serious, an official said.
She put the liquid mosquito repellent into the water bottle of her classmate on Monday at their private school in the city.
Later, the victim drank water from her bottle following which she complained of uneasiness and started vomiting. The girl was later taken to a hospital where she is undergoing treatment and is reported to be stable, Civil Lines police station in-charge Bhupendra Singh said.
Later, the school staff informed the police about the matter.
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"In the CCTV footage of the classroom, the accused girl was seen pouring the mosquito repellent into her classmate's water bottle and then hiding it inside the bag of another student," Singh said.
The victim, in her statement, told police she suspects that what her classmate did was because she secured more marks than her in exams, he said.
"The accused girl also consumed the mosquito repellent at her home yesterday and is currently admitted to the district hospital. We are investigating the incident," Singh said.
A doctor at the district hospital said the accused's condition was serious.
"We are treating her. She is serious but her condition is under control," Dr Sudhir Singh said.
A case was registered under IPC section 328 (causing hurt by means of poison) against the accused girl, police added.
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