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- Question
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
- Correct Answer
- 0.5 mole
ExplanationOne 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. - 1. 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
- 2. 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
- 3. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
Options- A. chain isomerism
- B. functional group isomerism
- C. positional isomerism
- D. metamerism Discuss
- 4. The main buffer system of the human blood is
Options- A. H2CO3 - HCO3
- B. H2CO3 - CO32-
- C. CH3COOH - CH3COO-
- D. NH2CONH2 - NH2CONH+ Discuss
- 5. 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
- 6. The molecule which has the highest percentage of ionic character among the following is
Options- A. HI
- B. HF
- C. HCI
- D. HBr Discuss
- 7. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
Options- A. granite
- B. basalt
- C. igneous rocks
- D. sedimentary rocks Discuss
- 8. The metal does not give H2 on treatment with dilute HCL is
Options- A. Zn
- B. Fe
- C. Ag
- D. Ca Discuss
- 9. The nuclear particles which are assumed to hold the nucleons together are
Options- A. electrons
- B. positrons
- C. neutrons
- D. mesons Discuss
- 10. The iron ore magnetite consists of
Options- A. Fe2O3
- B. Fe3OH4
- C. FeCO3
- D. 3Fe2O3 .. 3H2O Discuss
Chemistry problems
Search Results
Correct Answer: oxygen
Correct Answer: p-electrons in CI(Z = 17)
Correct Answer: positional isomerism
Correct Answer: H2CO3 - HCO3
Correct Answer: 5 gram of molecule
Correct Answer: HF
Correct Answer: igneous rocks
Correct Answer: Ag
Correct Answer: mesons
Correct Answer: Fe2O3
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