The substance most commonly used as a food preservative is
1). sodium carbonate
2). tartaric acid
3). acetic acid
4). sodium salt of benzoic acid
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1. The chemical name of Common salt is
2. Which of the following metals causes Itai-Itai disease ?
3. The chemical name of 'laughing gas is
4. Which of the following is not a precious/semi-precious stone?
6. In upper layer of atmosphere ozone is formed by
7. Which one of the following is used to restore the colour of old oil paintings?
8. Two moles of an ideal gas expand freely into vacuum. The work done by the gas is
9. The major harmful gas emitted by automobile vehicle which causes air pollution is