Question

How many Special Economic Zone(SEZ) are in our country?

Answer 1

At present there are eight functional SEZs located at Santa Cruz (Maharashtra), Cochin (Kerala), Kandla and Surat (Gujarat), Chennai (Tamil Nadu), Visakhapatnam (Andhra Pradesh), Falta (West Bengal) and Noida (Uttar Pradesh) in India. Further an SEZ in Indore (Madhya Pradesh) is now ready for operation. 

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Answer 2

SEZs are given some liberalism over taxation or labour laws etc.
There are some categories of SEZs.

There were about 143 SEZs (as of June 2012) operating throughout India, by February 2016 this had risen to 187.[15] 634 SEZs have been approved for implementation by the Government of India (as of June 2012)
By the Wikipedia data it stands around 436 approved and 199 exporting SEZs.