Trade parlance governs sales tax classification of nitrous oxide as a surgical aid rather than a general chemical

Sales tax classification turns on common parlance or trade parlance, not scientific composition alone. Nitrous oxide, though chemically a gas and capable of being described broadly as a chemical, was understood in trade as being sold mainly for anaesthetic use in hospitals and nursing homes. Because Entry No. 21 in Part S specifically covered surgical and dental aids and related hospital-use items, it prevailed over the broader chemical entry. On that basis, nitrous oxide was classified under the specific surgical-aid entry rather than as a general chemical.

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Issues: Whether nitrous oxide sold for use as an anaesthetic in hospitals and nursing homes was classifiable as a "chemical" under Entry No. 10-A in Part C of the Second Schedule to the Karnataka Sales Tax Act, 1957 or as a "surgical and dental aid" under Entry No. 21 in Part S of the Second Schedule to the Karnataka Sales Tax Act, 1957.

Analysis: Classification under sales tax entries is governed by the common parlance or trade parlance test, not by scientific composition alone. Nitrous oxide, though chemically a gas and capable of being described as a chemical in a broad sense, was found to be sold mainly for anaesthetic use in hospitals and nursing homes. Entry No. 21 in Part S specifically included surgical and dental instruments, tools and aids, including medicinal oxygen and similar items associated with surgery and hospital use. Where a product answers both a general description and a specific description, the specific entry excludes the general one. The material showed that nitrous oxide was understood in trade as a surgical aid rather than as a mere chemical.

Conclusion: Nitrous oxide was correctly classified under Entry No. 21 in Part S of the Second Schedule, and not under Entry No. 10-A in Part C. The challenge to the classification failed and the assessee's claim was rejected.

Ratio Decidendi: For sales tax classification, a product must be classified according to its popular or trade understanding, and a specific entry dealing with the product's actual commercial use prevails over a general entry covering goods of a broader class.

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