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- Question
One light year is approximately equal to
Options- A. 10^12 mts
- B. 10^16 mts
- C. 10^11 mts
- D. 10^13 mts
- Correct Answer
- 10^16 mts
ExplanationLight year is the unit of to express astronomical distances, that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More precisely, one light-year is equal to 9,500,000,000,000 kilometers.
Approximately, 1 light year = 10^16 mts.
- 1. Which one of the following is not true for minerals?
Options- A. they can be a liquid, solid, or glass
- B. they can be identified by characteristic physical properties
- C. they have a specific, internal, crystalline structure
- D. they have a specific, predictable chemical composition Discuss
- 2. What name is given to the bond between water molecules?
Options- A. Polar
- B. Polar covalent
- C. Hydrogen
- D. None of the above Discuss
- 3. Which of the following is not soluble in water?
Options- A. sodium chloride
- B. potassium sulfate
- C. copper(II) hydroxide
- D. silver nitrate Discuss
- 4. Barbituric Acid was synthesized in 1864 by
Options- A. Adolf von Baeyer
- B. Marie Curie
- C. Mendeleev
- D. John Dalton Discuss
- 5. When a chemical bond is broken energy is
Options- A. transferred
- B. released
- C. used
- D. None of the above Discuss
- 6. Laterite is chemically classified as
Options- A. argillaceous rock
- B. metamorphic rock
- C. caleareous rock
- D. sillcious rock Discuss
- 7. During which change is energy absorbed?
Options- A. Exothermic
- B. Endothermic
- C. Both A & B
- D. Neither A nor B Discuss
- 8. What determines the mass number of an element?
Options- A. Number of protons
- B. Number of electrons and protons
- C. Number of protons and neutrons
- D. Number of neitrons Discuss
- 9. What is the purpose of balancing chemical equations?
Options- A. law of conservation of energy
- B. law of conservation of mass
- C. Both A & B
- D. None of the above Discuss
- 10. The principal quantum number indicates what property of an electron?
Options- A. energy of electron
- B. distance of electron from nucleus
- C. both a & b
- D. number of subshells Discuss
More questions
Correct Answer: they can be a liquid, solid, or glass
Explanation:
A mineral is a naturally occurring, inorganic solid, with a definite chemical composition. They cannot be in liquid or gas state. They exists only in solid state.
Correct Answer: Hydrogen
Explanation:
The name given to the bond between water molecules is a hydrogen bond. These bonds occur between the slightly negative oxygen of one water molecule and the slightly positive hydrogen of another water molecule. Hydrogen bonding gives water special physical properties.
The differences in electronegativity between hydrogen and oxygen lead to an unequal sharing of electrons. Electronegativity measures how strongly an atom attracts electrons. Oxygen, with its higher electronegativity, pulls on the shared electrons more, giving the oxygen atom a partial net negative charge. The shared electrons spend less time with the hydrogen atoms; therefore, the hydrogen regions of water have partial positive charges.
Correct Answer: potassium sulfate
Explanation:
We know that,
All nitrates are soluble in water.
All chlorides are soluble in water with the exception of those formed with silver , lead , mercury ions as all halides are soluble.
Sulphates are soluble in water.
Hydroxides are not soluble in water.
Hence, copper(II) hydroxide is not soluble in water.
Correct Answer: Adolf von Baeyer
Explanation:
German Chemist, Adolf von Baeyer first synthesized Barbituric Acid in 1864.
Correct Answer: used
Explanation:
Bond breaking is an endothermic process.
Hence, bond breakage needs an amount of energy and uses some energy based on the strength of the bond to break the bond.
Correct Answer: argillaceous rock
Correct Answer: Endothermic
Explanation:
Endothermic reaction is the reaction in which energy is obserbed for the change.
Correct Answer: Number of protons and neutrons
Explanation:
The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.
Correct Answer: law of conservation of mass
Explanation:
The main purpose of balancing chemical equations is to make the mass of reactants is equal to mass of products obtained after the reaction. Hence, to make law of conservation of mass is purpose of balancing chemica equations.
Correct Answer: both a & b
Explanation:
The principal quantum number is the property of an electron which determines the energy of electron and the distance of electron from the nucleus of an atom.
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