Write true or False
a) Pointed ends of cutting instruments exert more pressure.
b) Water is an example of basic oxide.
c) Non-metals do not react with dilute mineral acid.
d) Germ theory of diseases was given by Leewenhoek.
e) Milk is preserved by pasteurization
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Answers
Answer:
1. TRUE
2. FALSE (since water is an amphoteric oxide)
3. FALSE (since a substance undergoing reaction with acids, donates electrons to the H+ ions produced by the acids. But non-metals are acceptor of electrons and hence they do not donate electron to the hydrogen ion of the acid.)
4. True
5. True
Explanation:
1.true
The cutting edges of tools like blades, knives etc., are provided with sharp edges to cut the things easily as the sharp edges has small area on which the force is applied, hence more pressure is applied.
2. true
All oxides in Group 1 & 2 elements are basic (except BeO), they react with water to form a base
3.false
Non-metal does not react with acids. Generally, the non-metals never react with dilute mineral acids
4.false
Girolamo Fracastoro (1478–1553) was an Italian physician who proposed a scientific germ theory of disease (theory of contagion) more than 300 years ago.
5.true
Pasteurisation makes sure milk is safe to drink (by killing any bacteria) and also helps to prolong its shelf life.
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