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- Question
The metal does not give H2 on treatment with dilute HCL is
Options- A. Zn
- B. Fe
- C. Ag
- D. Ca
- Correct Answer
- Ag
- 1. 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
- 2. The molecule which has the highest percentage of ionic character among the following is
Options- A. HI
- B. HF
- C. HCI
- D. HBr Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The nuclear particles which are assumed to hold the nucleons together are
Options- A. electrons
- B. positrons
- C. neutrons
- D. mesons Discuss
- 7. The iron ore magnetite consists of
Options- A. Fe2O3
- B. Fe3OH4
- C. FeCO3
- D. 3Fe2O3 .. 3H2O Discuss
- 8. The hydronium ion is
Options- A. H+
- B. HO -
- C. H2+
- D. H3O+ Discuss
- 9. 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
- 10. The ore which is found in abundance in India is
Options- A. monazite
- B. fluorspar
- C. bauxite
- D. magnetite Discuss
Chemistry problems
Search Results
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: oxygen
Correct Answer: p-electrons in CI(Z = 17)
Correct Answer: mesons
Correct Answer: Fe2O3
Correct Answer: H3O+
Correct Answer: the number of nucleons
Correct Answer: monazite
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