Discussion
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- Question
The iron ore magnetite consists of
Options- A. Fe2O3
- B. Fe3OH4
- C. FeCO3
- D. 3Fe2O3 .. 3H2O
- Correct Answer
- Fe2O3
- 1. The nuclear particles which are assumed to hold the nucleons together are
Options- A. electrons
- B. positrons
- C. neutrons
- D. mesons Discuss
- 2. The metal does not give H2 on treatment with dilute HCL is
Options- A. Zn
- B. Fe
- C. Ag
- D. Ca Discuss
- 3. 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
- 4. The molecule which has the highest percentage of ionic character among the following is
Options- A. HI
- B. HF
- C. HCI
- D. HBr Discuss
- 5. 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
- 6. The hydronium ion is
Options- A. H+
- B. HO -
- C. H2+
- D. H3O+ Discuss
- 7. 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
- 8. The ore which is found in abundance in India is
Options- A. monazite
- B. fluorspar
- C. bauxite
- D. magnetite Discuss
- 9. The items amenable to detection by soft x-rays are
Options- A. contrabands
- B. lead in bullets
- C. narcotics
- D. genuine coins from counterfeit coins Discuss
- 10. The material which can be deformed permanently by heat and pressure is called a
Options- A. thermoplastic
- B. thermoset
- C. chemical compound
- D. polymer Discuss
Chemistry problems
Search Results
Correct Answer: mesons
Correct Answer: Ag
Correct Answer: igneous rocks
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: H3O+
Correct Answer: the number of nucleons
Correct Answer: monazite
Correct Answer: genuine coins from counterfeit coins
Correct Answer: thermoset
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