What are the safety precautions and hazard symbols related to chemicals in a laboratory setting?

here are the answers to the questions:

27. The question asks what can reduce inhalation risk in the laboratory.

• Using a fume hood is designed to draw away hazardous fumes and reduce the risk of inhaling them. Storing chemicals in open containers or performing experiments on open benches would increase the risk.
• The correct option is (c) using fume hood.

28. The question asks for the term describing the long-term effect of repeated exposure to a hazardous chemical.

• A chronic effect refers to health effects that develop slowly over a long period due to repeated or continuous exposure to a substance.
• The correct option is (a) chronic.

29. The question asks what the skull and crossbones symbol represents on a chemical label.

• The skull and crossbones symbol is universally recognized to indicate that a substance is toxic or poisonous.
• The correct option is (c) toxic.

30. The question asks for the definition of an acute chemical hazard.

• An acute chemical hazard is one that causes an immediate health effect after a single, short-term exposure.
• The correct option is (c) causes immediate health effect.

31. The question asks which symbol represents a flammable substance.

• A flame symbol is used to indicate that a substance is flammable.
• The correct option is (c) flame.

32. The question asks which of the given options is a biological hazard.

• A biological parasite is a living organism that lives on or in another organism and causes harm, making it a direct biological hazard. Biological cultures can also be hazards if they contain pathogenic organisms.
• The correct option is (a) biological parasite.

33. The question asks how chemical waste should be disposed of.

• Chemical waste must always be disposed of according to lab waste protocol to ensure safety and environmental protection. Disposing in the sink or general trash is incorrect.