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Q. Answer the following questions—
(a) Why is gold preferred for making jewellery?
(b) Write a short note on viruses.
(c) Write the positive agent of typhoid, malaria, cholera, dysentery and hepatitis.
(d) Name some organisms that cause food poisoning.
(e) More reactive metals displace less reactive metals from their compounds in aqueous solutions. Name the reactions.
(f) identify the following scientists and write about their major discoveries (fig. is in the attachment)
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Answers
(a) Gold is malleable, which means it can be beaten into very thin sheets. Gold is used to make jewelry because of the attractiveness of its luster and because of its rarity. It also doesn't tarnish and doesn't react with air the way a metal like iron does. ... Therefore, gold is alloyed with other metals to make it stronger.
(b) A virus is a small infectious agent that replicates only inside the living cells of an organism. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
(C) TYPHOID:-Typhoid is a bacterial infection that can lead to a high fever, diarrhea, and vomiting. It can be fatal. It is caused by the bacteria Salmonella typhi.
MALARIA:- Malaria is a serious, life-threatening, and sometimes fatal, disease spread by mosquitoes and caused by a parasite. Malaria was a significant health risk in the U.S. until it was eliminated by multiple disease-control programs in the late 1940s. The illness presents with flu-like symptoms that include high fever and chills.
CHOLERIA:- Cholera is an acute epidemic infectious disease. It is characterized by watery diarrhea, extreme loss of fluid and electrolytes, and severe dehydration. It can be fatal.
DYSENTERY:- Dysentery is an inflammation of the intestine characterized by the frequent passage of feces with blood and mucus. Like cholera, dysentery is spread by fecal contamination of food and water, usually in impoverished areas with poor sanitation.
HEPATITIS:- Hepatitis is an inflammation of the liver. The condition can be self-limiting or can progress to fibrosis (scarring), cirrhosis or liver cancer. Hepatitis viruses are the most common cause of hepatitis in the world but other infections, toxic substances (e.g. alcohol, certain drugs), and autoimmune diseases can also cause hepatitis.
(d) The bacterium Campylobacter jejuni is a common cause of food poisoning.
(e) Displacement reaction
(f)
sorry
because
i can't identify the scientist
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Answer:
Explanation:
Gold is least reactive metal . It is shiny and is placed at bottom of reactivity series and it is not affected by air , water etc. . That is why gold is used to make jewellery