Chemical formula for sulphurous acid is1). $H_2SO_4$2). $H_2SO_3$3). $H_3SO_3$4). $H_3SO_4$

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1.	Chemical formula for sulphurous acid is:1). $H_{2}SO_{4}$2). $H_{2}SO_{3}$3). $H_{3}SO_{3}$4). $H_{3}SO_{4}$
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Chemical formula for sulphurous acid is:1). $H_{2}SO_{4}$2). $H_{2}SO_{3}$3). $H_{3}SO_{3}$4). $H_{3}SO_{4}$