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- Question
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
- Correct Answer
- igneous rocks
- 1. The molecule which has the highest percentage of ionic character among the following is
Options- A. HI
- B. HF
- C. HCI
- D. HBr Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
Options- A. chain isomerism
- B. functional group isomerism
- C. positional isomerism
- D. metamerism Discuss
- 6. The metal does not give H2 on treatment with dilute HCL is
Options- A. Zn
- B. Fe
- C. Ag
- D. Ca Discuss
- 7. The nuclear particles which are assumed to hold the nucleons together are
Options- A. electrons
- B. positrons
- C. neutrons
- D. mesons Discuss
- 8. The iron ore magnetite consists of
Options- A. Fe2O3
- B. Fe3OH4
- C. FeCO3
- D. 3Fe2O3 .. 3H2O Discuss
- 9. The hydronium ion is
Options- A. H+
- B. HO -
- C. H2+
- D. H3O+ Discuss
- 10. The mass number of an atom is equal to
Options- A. the number of protons
- B. the number of protons and electrons
- C. the number of nucleons
- D. the number of neutrons Discuss
Chemistry problems
Search Results
Correct Answer: HF
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: oxygen
Correct Answer: p-electrons in CI(Z = 17)
Correct Answer: positional isomerism
Correct Answer: Ag
Correct Answer: mesons
Correct Answer: Fe2O3
Correct Answer: H3O+
Correct Answer: the number of nucleons
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