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- Question
Which of the following carbohydrates is a polysaccharide?
Options- A. Fructose
- B. Cellulose
- C. Glucose
- D. Sucrose
- Correct Answer
- Cellulose
ExplanationCarbohydrates are also called as saccharides are molecular compounds made from just three elements:
carbon, hydrogen and oxygen.
Carbohydrates are:
* a source of energy for the body e.g. glucose and a store of energy, e.g. starch in plants
* building blocks for polysaccharides (giant carbohydrates), e.g. cellulose in plants and glycogen in the human body
* components of other molecules eg DNA, RNA, glycolipids, glycoproteins, ATP
Types:
1. Monosaccharides (e.g. glucose) and
2. Disaccharides (e.g. sucrose) are relatively small molecules. They are often called sugars.
3. Other carbohydrate molecules are very large called Polysaccharides such as starch and cellulose.
- 1. Which one phosphorylates ADP to make ATP? Discuss
- 2. Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen.......
Options- A. Law of conservation of mass
- B. Law of multiple proportion
- C. Law of reciprocal proportions
- D. Law of definite proportions Discuss
- 3. Which of the following is a false statement?
Options- A. As bond order increases the strength of the bond increases
- B. Bond order is proportional to the bond length
- C. Molecules with negative bond order are highly unstable
- D. Bond order is inversely proportional to the bond length Discuss
- 4. What is the primary component of natural gas?
Options- A. Nitrogen
- B. Ethane
- C. Propane
- D. Methane Discuss
- 5. What is the heaviest noble gas?
Options- A. krypton
- B. radon
- C. helium
- D. xenon Discuss
- 6. Which of the following is not a compound?
Options- A. Brass
- B. Quick lime
- C. Marble
- D. Soda ash Discuss
- 7. Which of these molecules are polar? Check all that apply.
Options- A. SO2
- B. CH2Cl2
- C. PCl3
- D. All the above Discuss
- 8. Which pair of atoms has the highest electronegativity difference? (Calcium's electronegativity is 1.0 Fluorine's electronegativity is 4.0 Hydrogen's electronegativity is 2.2 Sodium's electronegativity is 0.93)
Options- A. F-F
- B. Ca-F
- C. H-F
- D. Na-F Discuss
- 9. Intermolecular forces in HCl are
Options- A. Hydrogen bonding
- B. Dipole-dipole
- C. Dispersion force
- D. All the above Discuss
- 10. Which solution is most concentrated?
Options- A. 6 g of solute in 10 ml of solution
- B. 20.5 g of solute in 50 ml of solution
- C. 30 g of solute in 120 ml of solution
- D. 2.6 g of solute in 2 ml of solution Discuss
Chemistry problems
Search Results
Correct Answer: ATP synthase Phosphorylates ADP to make ATP
Correct Answer: Law of multiple proportion
Correct Answer: Bond order is proportional to the bond length
Explanation:
Bond order is proportional to the bond length is a False statement since Bond order is inversely proportional to the bond length.
Correct Answer: Methane
Explanation:
Natural gas is primarily composed of methane, but also contains ethane, propane, and heavier hydrocarbons.
Natural gas is a colorless, tasteless, odorless, and non-toxic gas. Because it is odorless, mercaptan is added to the natural gas, in very small amounts to give the gas a distinctive smell of rotten eggs. This strong smell can alert you of a potential gas leak.
It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.
Correct Answer: radon
Explanation:
The seven elements ? helium, neon, argon, krypton, xenon, radon, and oganesson of Group 18 of the periodic table are Noble or Inert gases.
Radon is the heaviest and Helium is the lightest gases of the noble gases.
Correct Answer: Brass
Correct Answer: All the above
Correct Answer: Na-F
Explanation:
F-F = 4 - 4 = 0
Ca-F = 4 - 1 = 3.0
H-F = 4 - 2.2 = 1.8
Na-F = 4 - 0.93 = 3.07
Hence, the highest electronegativity difference is in Na-F.
Correct Answer: All the above
Explanation:
Intermolecular forces :
The forces of attraction present in between the molecules or atoms or compounds is termed as intermolecular forces.
The molecule HCl is composed of hydrogen and chlorine atom. There is high difference in electronegativities therefore, it is polar in nature. The H end of HCl is permanently slightly positive charge. The Cl end of HCl has a permanent slight negative charge. the "H" in one molecule is attracted to the "Cl" in a neighbor. The intermolecular force is weak compared to a covalent bond. But this dipole-dipole interaction is one of the stronger intermolecular attractions.
It also has hydrogen bonding and dispersion forces.
Dispersion forces are the weakest forces which are present in between all molecules or atoms.
Hydrogen bonds are present in molecules having at least one H-A bond where A is the strong electronegative atom (mainly F, Cl and N).
Correct Answer: 2.6 g of solute in 2 ml of solution
Explanation:
A concentrated solution will contain the most solute molecules per solvent molecules.
Here in the given options,
1) 6/10 = 0.6
2) 20.5/50 = 0.41
3) 30/120 = 0.25
4) 2.6/2 = 1.3
Hence, option D) is most concentrated.
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