Hello Aspirant,

No you will not be rejected based on this . If you have entered the right roll number in the same format given in your 10th certificate , then you do not have to worry. Moreover during document verification ,you can say the space was entered by mistake, if they ask. Such small typing mistakes won't be an issue. They mainly strict with the format of photo and signature ,so rejections will happen only on the basis of mistakes in the same. So instead of worrying about that focus on your preparation and do well in the exam.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/how-to-prepare-for-ssc-chsl/amp&ved=2ahUKEwjew42fu4zuAhVmxjgGHeQtAiUQFjABegQIAxAG&usg=AOvVaw02UHZy9hMZoQqijHQe0Kvl&ampcf=1

https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/best-books-to-prepare-for-ssc-chsl/amp&ved=2ahUKEwjew42fu4zuAhVmxjgGHeQtAiUQtwIwAnoECCgQAQ&usg=AOvVaw3cOk1HD7XZlWPkaa7H4hpr&ampcf=1

All the best