The relative molecular mass of Na2S2O3.5H2O is
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41%
250 amu
44%
248 amu
12%
246amu
3%
234amu
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What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?
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22%
11.0 g
43%
22.0g
21%
2.8g
14%
44.0 g
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
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31%
13
44%
10
19%
14
6%
16
How many electrons are present in M-shell of an element with atomic number 20?
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11%
5
55%
8
16%
12
18%
18
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Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be ………….. and ……………. respectively.
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14%
1,0
59%
0,1
24%
2,1
4%
1,2
The maximum number of electrons in a shell is given by ……………..
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40%
2n
20%
n
35%
2n^2
6%
None
Which of the following are covered by a single membrane?
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39%
Mitochondria
43%
Vacoule
15%
Lysosome
4%
None
Cell wall of which one of these is not made up of cellulose?
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45%
Bacteria
29%
Hydriila
16%
Cactus
11%
Mango tree
Plant cells are stained using the stain called …………….
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31%
Dna
50%
Safrain
13%
Cactus
6%
Tree
The movement of water molecules through a selectively permeable membrane is called …………….
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56%
Osmosis
28%
Diffusion
12%
Absorption
3%
None
Virchow stated that ……………. arise from pre-existing cells.
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54%
All cell
31%
All tissue
12%
All organ
3%
None
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