Dear aspirant ! I would like to answer your question  as JEE mains i.e. joint entrance exam  mains is a national level examination  conducted  by NTA . 

NTA  authority have right to realise  paper but it is not necessary  all the time that every question will be correct  . 

If in case candidate  found some mistakes in questions  during examination  then he /she has right to case a complaint  file against  the  authority. Well in this year too some questions  were facing big trouble  as they are found to be worng . There are 2 questions in chemistry  were worng and 6-7 questions  in physics  were worng . 

Although  in this situation  NTA authority  takes strick action to help the jee candidates. 

I hope this that this information  will  help you in any way!

Thankyou!

Hello,
NTA, the exam conducting authority has released the Question Paper & Answer key on the official website. As per the notification released by the exam conducting authority, candidates can challenge the answer key till 16th April 2019. The final answer key of JEE main April session exam will be releasing soon. If candidates want to challenge the answer key, then they have to submit the document as a proof with a fee of rs .1000 for each question. According to our Entrance360 experts, there could be 10 Questions which were wrong, 7 Questions in Physics, 2 Questions in Chemistry and 1 Questions in mathematics.
Follow the link below to know the wrong questions with their solutions.
https://www.entrance360.com/engineering/wrong-questions-in-jee-main-april-2019/
I hope this helps.

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