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- Question
The number of electron levels in a magnesium atom is
Options- A. 3
- B. 2
- C. 1
- D. 0
- Correct Answer
- 3
- 1. The acid used in lead storage cells is
Options- A. Sulphuric acid
- B. Nitric acid
- C. Hydrochloric acid
- D. Phosphoric acid Discuss
- 2. The reactivity of an atom arises from
Options- A. the existence of unpaired electrons in the valence shell
- B. the potential energy of the valence shell
- C. the average distance of the outermost electron shell from the nucleus
- D. the sum of the potential energies of all the electron shells Discuss
- 3. Technically, tempera is paint in which the vehicle is in
Options- A. an emulsion
- B. a pigment
- C. an impasto
- D. a ground Discuss
- 4. The bonds in the compound MgSO4 can be described as
Options- A. covalent
- B. ionic
- C. both A & B
- D. None of the above Discuss
- 5. A colored ion generally indicates a
Options- A. transition metal
- B. metalloid
- C. large in size
- D. Both B & C Discuss
- 6. Arrange the following compounds in order of increasing acidity?
Options- A. o-cresol < phenol < o-nitrophtenol
- B. phenol < o-nitrophtenol < o-cresol
- C. o-nitrophtenol < o-cresol < phenol
- D. None of the above Discuss
- 7. which of the following molecule contains a nonpolar covalent bond?
Options- A. Br2
- B. CO2
- C. CCl4
- D. CO Discuss
- 8. Which kind of energy is stored in a chemical bond?
Options- A. Potential energy
- B. Kinetic energy
- C. Both A & B
- D. None of the above Discuss
- 9. The luster of a metal is due to presence of free electrons.
Options- A. TRUE
- B. FALSE Discuss
- 10. Which properties are characteristic of the group 1 metals?
Options- A. Low melting points
- B. Produce hydrogen when react with water
- C. Soft in nature
- D. All of the above Discuss
Chemistry problems
Search Results
Correct Answer: Sulphuric acid
Correct Answer: the existence of unpaired electrons in the valence shell
Explanation:
The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.
Correct Answer: an emulsion
Correct Answer: both A & B
Explanation:
Here the given compound is MgSO4.
In the given compound, Sulphur (S) and Oxygen (O) are two non metals and Magnesium (Mg) is a metal.
In this compound, Sulphur and Oxygen reacts to form covalent bond and the metal Magnesium reacts with both non metals Sulphur and Oxygen to form ionic bonds.
Hence, in the given compound MgSO4 there are both covalent and ionic bonds.
Correct Answer: transition metal
Explanation:
A colored ion generally indicates a transition metal.
Correct Answer: o-cresol < phenol < o-nitrophtenol
Correct Answer: Br2
Explanation:
Br-Br.
In Br2, two of the same atoms, pull on each side of the bond is equal making it as non-polar.
The other options all include a significantly more electronegative atom (the oxygens and the chlorine), so those bonds are all polar covalent.
Correct Answer: Potential energy
Correct Answer: TRUE
Explanation:
True, The luster of a metal is due to presence of free electrons. Luster means shine or soft glow. We know that metals have the quality of reflecting light from its surface.
Correct Answer: All of the above
Explanation:
Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.
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