Which of the following is correct ?...

Which of the following is correct ?

`Zn + HCl rarr ZnCl_2 + H_2`

`2 Zn + HCl rarr 2 ZnCl_2 + H-2`

`Zn+2 Hclrarr ZnCl_2 + H_2`

`Zn + 2 HCl rarr ZnCl_2 + H_2`

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