Hello Aspirants. Welcome to Online General Knowledge section in Affairs cloud, which is important for all the competitive exams. We have created Some questions related to General Science(Chemistry) !!!
- ……………………….. is the process of conversion of the solid phase to gas phase without passing an intermediate liquid phase
1.Evaporation
2.Oxidation
3.Sublimation
4.Condensation
5.None of these
Answer – 3.Sublimation
Explanation :
Sublimation is the process of conversion of the solid phase to gas phase without passing an intermediate liquid phase.This process is used to separate a sublimate particles from non sublimate.
- Elements contain only ………………… type of atoms
1.Single
2.Many
3.Same
4.Different
5.None of these
Answer – 1.Single
Explanation :
Elements contain only single type of atoms.
Presently there are 118 atoms.Out of which 94 are natural
Ex of element: Oxygen, Sulphur etc.
- Elements have the following order of abundance in earth crust
1.Calcium<Silicon<Aluminium<Oxygen<Iron
2.Oxygen<Silicon<Aluminium<Iron<Calcium
3.Silicon>Aluminium>Iron>Oxygen>Calcium
4.Oxygen>Silicon>Aluminium>Iron>Calcium
5.None of these
Answer – 4.Oxygen>Silicon>Aluminium>Iron>Calcium
Explanation :
Elements have the following order of abundance in earth crust Oxygen>Silicon>Aluminium>Iron>Calcium
- Elements have the following order of abundance in human body
1.Nitrogen>Calcium<Carbon<Oxygen
2.Oxygen>Carbon>Hydrogen>Nitrogen
3.Hydrogen>Oxygen>Magnesium>Carbon
4.Oxygen<Carbon<Hydrogen<Nitrogen
5.None of these
Answer – 2.Oxygen>Carbon>Hydrogen>Nitrogen
Explanation :
Elements have the following order of abundance in human body Oxygen>Carbon>Hydrogen>Nitrogen
- ……………. contain more than one kind of atoms
1.Substance
2.Elements
3.Compounds
4.Atom
5.None of these
Answer – 3.Compounds
Explanation :
Compounds contain more than one kind of atoms. These can’t be separated into constituent atoms by simple methods.
Ex: Silica, Salt
- Avogadro’s number is …………………………..
1.3.025×1024
2.4.023×1026
3.5.020×1025
4.6.023×1023
5.None of these
Answer – 4. 6.023×1023
Explanation :
1 mol atom = 6.023×1023 atoms – Avogadro’s number
It states that the number of molecules present in 12g of C-12 is called one mol
- Which does not exist in free state ?
1.Atom
2.Molecule
3.Compound
4.Mixture
5.None of these
Answer – 1.Atom
Explanation :
Atom does not exist in free state.Atom is the smallest particle of matter that takes part in chemical reaction
- A solution contain 2 components.Which is in less quantity is called as
1.Substance
2.Solvant
3.Solution
4.Solute
5.None of these
Answer – 4.Solute
Explanation :
A solution contain 2 components.Which is in less quantity is called as Solute
Ex: The salt is the solute and the water the solvent
In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
- A solution contain 2 components.Which is in more quantity is called as
1.Substance
2.Solvant
3.Solution
4.Solute
5.None of these
Answer – 2.Solvant
Explanation :
A solution contain 2 components.Which is in more quantity is called as Solvant
The salt is the solute and the water the solvent.
In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
- ………………… is the only atom in which neutrons are not present
1.Carbon
2.Oxygen
3.Hydrogen
4.Helium
5.None of these
Answer – 3.Hydrogen
Explanation :
A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus.It has only one electron and one proton
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