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During industrial revolution (in 1860), ...

During industrial revolution (in 1860), the amount of carbon dioxide was present in the atmosphere ~ 290 ppm. At present, the amount is ~330 ppm.
This is due to widespread industrialization of

A

Coal

B

Natural gas

C

Oil

D

All are correct

Text Solution

Verified by Experts

The correct Answer is:
D
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In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants synthesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. C-14 exists in atmosphere due to:

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Knowledge Check

  • In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants synthesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. C-14 exists in atmosphere due to:

    A
    conversion of C-12 to C-14
    B
    combustion of fossil fuel
    C
    bombardment of atmospheric nitrogen by cosmic ray neutrons.
    D
    none of above

  • Addition of non-volatile solute to a solvent always increases the colligative properties such as osmotic pressure. Delta P . Delta T_b and Delta T_f . All these colligative properties are directly proportional to molality if solutions are dilute. The increases in colligative properties on addition of non-volatile solute is due to increases in number of solute particles. 1 g mixture of glucose and urea present in 250mL aqueous solution shows the osmotic pressure of 0.74 atm at 27^@C . Assuming solution to be dilute which are correct ? 1. Percentage of urea in mixture is 17.6. 2. Relative lowering in vapour pressure of this solution is 5.41 xx 10^(-4) . 3. The solution will boil at 100.015^@C . if k_b of water is 0.5 k molality^(-1) . 4. If glucose is replaced by same amount of sucrose the solution will show higher osmotic pressure at 27^@C . 5. If glucose is replaced by same amount of NaCI, the solution will show lower osmotic pressure at 27^@C .

    A
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    B
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    C
    2,4,5
    D
    1,4,5