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- Question
The main buffer system of the human blood is
Options- A. H2CO3 - HCO3
- B. H2CO3 - CO32-
- C. CH3COOH - CH3COO-
- D. NH2CONH2 - NH2CONH+
- Correct Answer
- H2CO3 - HCO3
- 1. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is
Options- A. 1 gram of molecule
- B. 0.5 gram of molecule
- C. 5 gram of molecule
- D. 10 gram of molecule Discuss
- 2. The molecules of which gas have highest speed?
Options- A. H2 at -73oC
- B. CH4 at 300 K
- C. N2 at 1,027oC
- D. O2 at 0oC Discuss
- 3. The graphite rods in the nuclear reactor
Options- A. react with U to release energy
- B. produce neutrons
- C. undergo combustion which triggers the nuclear fission
- D. convert fast moving neutrons into thermal neutrons Discuss
- 4. The mineral containing both magnesium and calcium is
Options- A. magnesite
- B. calcite
- C. carnallite
- D. dolomite Discuss
- 5. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
Options- A. an addition reaction
- B. a condensation reaction
- C. an oxidation reaction
- D. an elimination reaction Discuss
- 6. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
Options- A. chain isomerism
- B. functional group isomerism
- C. positional isomerism
- D. metamerism Discuss
- 7. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
Options- A. p-electrons in Ne(Z = 10)
- B. s-electrons in Mg(Z = 12)
- C. d-electrons in Fe(Z = 26)
- D. p-electrons in CI(Z = 17) Discuss
- 8. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
Options- A. carbon
- B. hydrogen
- C. oxygen
- D. nitrogen Discuss
- 9. What are the number of moles of CO2 which contains 16 g of oxygen?
Options- A. 0.5 mole
- B. 0.2 mole
- C. 0.4 mole
- D. 0.25 mole Discuss
- 10. The molecule which has the highest percentage of ionic character among the following is
Options- A. HI
- B. HF
- C. HCI
- D. HBr Discuss
Chemistry problems
Search Results
Correct Answer: 5 gram of molecule
Correct Answer: H2 at -73oC
Correct Answer: convert fast moving neutrons into thermal neutrons
Correct Answer: dolomite
Correct Answer: a condensation reaction
Correct Answer: positional isomerism
Correct Answer: p-electrons in CI(Z = 17)
Correct Answer: oxygen
Correct Answer: 0.5 mole
Explanation:
One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.
Correct Answer: HF
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