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- Question
What does 'M' stand for in chemistry?
- Correct Answer
- 'M' is used as a unit of molarity and stands for mole per litre ie, number of moles of solute per liter of solution
- 1. Which combination of atoms can form a polar covalent bond?
Options- A. H and Br
- B. H and H
- C. Na and Br
- D. N and N Discuss
- 2. 'Minamata' disease was caused by ?
Options- A. Lead
- B. Mercury
- C. Cadmium
- D. Zinc Discuss
- 3. Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :
Options- A. Chloroform
- B. 2, 2, 2-Trichloroethanol
- C. Trichloromethanol
- D. 2, 2, 2-Trichloropropanol Discuss
- 4. The Most Abundant Rare Gas in the Atmosphere is
Options- A. Xe
- B. He
- C. Ne
- D. Ar Discuss
- 5. Acid Precipitation is caused by a mix of
Options- A. Hydrogen, Oxygen, and Saline
- B. Water, Soil, and Air
- C. Respiration, Carbonic Acids, and Seawater
- D. Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides Discuss
- 6. NH3 oxidation number?
Options- A. -1
- B. +1
- C. 0
- D. -3 Discuss
- 7. Which one of the following is an element?
Options- A. Topaz
- B. Rruby
- C. Diamond
- D. Sapphire Discuss
- 8. Which element is not a part of a nitrogenous base?
Options- A. Carbon
- B. Oxygen
- C. Phosphorous
- D. Nitrogen Discuss
- 9. Which is the only gem of world made of a single element?
Options- A. Platinum
- B. Diamond
- C. Emerald
- D. Ruby Discuss
- 10. Which one of the following laws directly expalins the law of coservation of mass
Options- A. Hund's rule
- B. Dalton's law
- C. Avogadro's law
- D. Berzelius hypothesis Discuss
Chemistry problems
Search Results
Correct Answer: H and Br
Explanation:
Only H and Br form Polar Covalent Bond.
Covalent bonding:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.
1. Polar Covalent Bond
2. Nonpolar Covalent Bond
1. Polar Covalent Bond:
A Polar Covalent Bond is created when the shared electrons between atoms are not equally shared. This occurs when one atom has a higher electronegativity than the atom it is sharing with. The atom with the higher electronegativity will have a stronger pull for electrons (Similiar to a Tug-O-War game, whoever is stronger usually wins). As a result, the shared electrons will be closer to the atom with the higher electronegativity, making it unequally shared.
2. Nonpolar Covalent Bond:
A Nonpolar Covalent Bond is created when atoms share their electrons equally. This usually occurs when two atoms have similar or the same electron affinity. The closer the values of their electron affinity, the stronger the attraction. This occurs in gas molecules; also known as diatomic elements. Nonpolar covalent bonds have a similar concept as polar covalent bonds; the atom with the higher electronegativity will draw away the electron from the weaker one.
Here H and H and N and N form Non-polar covalent bonds. Na and Br form the ionic bond.
Correct Answer: Mercury
Correct Answer: 2, 2, 2-Trichloroethanol
Explanation:
Correct Answer: Ar
Explanation:
Argon is most the most abundant Rare Gas in the atmosphere. Its elemental symbol is Ar.
Correct Answer: Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides
Explanation:
Acid Precipitation or Acid rain is caused by a mix of Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides.
A Chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as Acid Rains.
Correct Answer: 0
Explanation:
NH3, Ammonia is a neutral compound as the individual oxidation numbers elements that make up the compound NH3 are Nitrogen (N) and Hydrogen (H) sum to zero.
We do not speak of the oxidation number of a molecule. We can speak of the oxidation numbers of the individual elements that make up the compound.
Here the oxidation number of Nirogen is -3 and that of Hydrogen is +1.
Now, NH3 = 1(-3) + 3(+1) = -3 + 3 = 0.
Correct Answer: Diamond
Explanation:
Here in the given options, Diamond is an element as it is the allotrope of the carbon atom.
Correct Answer: Phosphorous
Explanation:
A nitrogenous base is an element that contains nitrogen that have same chemical properties of the base.
Correct Answer: Diamond
Correct Answer: Avogadro's law
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