The Lucknow seat from where BJP President Rajnath Singh is contesting and Amritsar, from where Leader of the Opposition in the Rajya Sabha Arun Jaitley is pitted against former Punjab chief minister Amrinder Singh of Congress also go for polls on April 30.
The fate of BJP veteran Murli Manohar Joshi, who is contesting from Kanpur, Congress leader Ambika Soni (Anandpur Sahib) and BJP's Uma Bharti (Jhansi) will also be decided on that day.
Out of the 89 constituencies, 17 are in Andhra Pradesh, 26 in Gujarat, seven in Bihar, one each in Jammu and Kashmir, Daman and Diu, Dadra and Nagar Haveli, 13 in Punjab, 14 in Uttar Pradesh and nine in West Bengal.
With the issuance of notification, candidates can file nominations till April 9, while scrutiny of their papers will take place the next day.
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April 12 is the last date of withdrawing from contest.
On April 12 another notification will be issued for the 8th phase of polling on May 7 in 64 constituencies in seven states.