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Q: Which of the following is a vat dye? निम्न में से कौन-सा एक वैट रंजक है?
  • A. Turmeric/हल्दी
  • B. Salt/नमक
  • C. Coltar/कोलतार
  • D. Indigo/इण्डिगो
Correct Answer: Option D -
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Explanations:

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