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Forwarded from Shubham Jha - Class 9
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๐7๐ฅ1
The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is:
Anonymous Quiz
26%
18
53%
19
19%
20
2%
21
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๐6๐4โค2
The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as
Anonymous Quiz
35%
Roasting
32%
Smelting
25%
Calcination
9%
Refining
๐7๐ค4๐1
enzymes pepsin and trypsin are secreted respectively by
Anonymous Quiz
34%
Stomach and pancreas
27%
Salivary gland and stomach
37%
Liver and pancreas
2%
None
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Among the following choose the correct option which includes the organisms that have a holozoic mode of nutrition:
Anonymous Quiz
42%
Plasmodium and Amoeba
25%
Parakeet and Amoeba
24%
Paramecium and Plasmodium
9%
Paramecium and Parasite
๐ฑ9๐8โค1๐1
Which of the given properties is generally not shown by metals?
Anonymous Quiz
21%
Electrical conduction
17%
Ductility
47%
Dullness
14%
Sonorous
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The ability of metals to be drawn into thin wire is known as
Anonymous Quiz
39%
Ductility
42%
Malleability
14%
Sonorous
5%
None
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Generally metals react with acids to give salt and hydrogen gas. Which of the given acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
Anonymous Quiz
32%
H2so4
25%
Hcl
25%
Hno3
18%
Alll
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Galvanisation is a method of protecting iron from rusting by coating with a thin layer of
Anonymous Quiz
21%
Gallilum
29%
Alluminium
45%
Zinc
5%
Silver
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If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
Anonymous Quiz
30%
Cuso4
38%
Cuco3
23%
Cuo
9%
All
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