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प्रश्न
In which of the following industries, microbial enzymes are not used?
a) Glass industry.
b) Cheese industry
c) Tanning industry.
d) Paper industry.
उत्तर
a) Glass industry.
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संबंधित प्रश्न
Write any three differences between metals and non-metals with respect to their physical properties.
Give an example of a metal which is a poor conductor of heat.
Fill in the blanks:
Phosphorus is a very _________ non-metal.
Choose the most appropriate answer of the following:
This is not an alloy of copper:
(A) Brass
(B) Bronze
(C) Solder
(D) Duralumin.
Which property of copper and aluminium makes them suitable for making cooking utensils and boilers?
Name a non-metal that is used for cancer therapy
Match the statements in Column A, with those in Column B .
| Column A | Column B | ||
| 1 | A metal used for making high quality mirrors . | a | Chlorine |
| 2 | A metal which neither malleable nor ductile. | b | Graphite |
| 3 | A non-metal,used in the sterilsation of water. | c | Iodine |
| 4 | A non-metal, whose deficiency can lead to disease like goitre. | d | Silver |
| 5 | A non -metal which can be used as dry lubricant. | e | Zinc |
State any five physical properties of a metal.
Physical properties of a metal :
Name a non-metal whose compounds help in the growth of plants.
Name:
a non- metal used in alloys
Name:
a non-malleable metal
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Name:
two metallic oxides which are amphoteric
Name:
a non metal which can form a positive ion
How many valence electrons are present in:
(ii) non-metals?
Name a non-metal which can form a positive ion.
Describe a simple experiment to prove that a copper wire conducts electricity, but a piece of coal does not.
Select the appropriate option for the following statement:
The element placed in the extreme left of the Modern Periodic Table.
Select the appropriate option for the following statement:
The element from the halogen family which is most abundant
