In the 1930s C.B. van Niel correctly hy...

In the 1930s C.B. van Niel correctly hypothesized that oxygen atoms in the oxygen gas released by plants come from

A

`H_(2)O`

B

`CO_(2)`

C

`C_(6)H_(12)O_(6)`

D

`O_(3)`

Text Solution

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The correct Answer is:

A

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Knowledge Check

Which is the evidence to show that oxygen released in photosynthesis comes form water ?

A

isotopic oxygen supplied as `H_(2)O` appears in the `O_(2)` released in photosynthesis

B

activated chloroplast in `H_(2)O` releases `O_(2)` if supplied potasium ferrocyanide or some other reducing agent

C

photosynthetic bacteria use `H_(2)S and CO_(2)` to make carbohydrates `H_(2)O` and sulphur

D

all of the above

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66g of diborane (atomic mass of B = 10.8 u)-

A

3.2 h

B

1.6 h

C

6.4 h

D

0.8 h

How long (appropriate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane ? (Atomic weight of B = 10.8 u)

A

3.2 hours

B

1.6 hours

C

6.4 hours

D

0.8 hours

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