Discussion
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- Question
Through which conversion is energy released?
Options- A. CO2 and H2O to C6H12O6 and O2
- B. NADP+ to NADPH
- C. ADP to ATP
- D. ATP to ADP
- Correct Answer
- ATP to ADP
- 1. What element is used to disinfect swimming pools?
Options- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Sulphur Discuss
- 2. What element behaves most like magnesium?
Options- A. Sr
- B. S
- C. Si
- D. Sn Discuss
- 3. Which sample of matter is a mixture?
Options- A. KBr (S)
- B. NaCl (L)
- C. K (S)
- D. NaCl (Aq) Discuss
- 4. What molecule is indicated by the letter D?
Options- A. ATP
- B. Water
- C. Glucose
- D. Oxygen Discuss
- 5. The carbon tetrachloride molecule (CCl4) is
Options- A. a nonpolar molecule with polar bonds
- B. a nonpolar molecule with nonpolar bonds
- C. a polar molecule with polar bonds
- D. a polar molecule with nonploar bonds Discuss
- 6. Which bond has the greatest ionic character?
Options- A. H-F
- B. H-Cl
- C. H-N
- D. H-O Discuss
- 7. Bullet proof material is made up of which polymer?
Options- A. Poly carbonates
- B. Poly vinyl
- C. Poly amides
- D. Polychloride Discuss
- 8. The most electronegative element among the following is
Options- A. Oxygen
- B. Chlorine
- C. Nitrogen
- D. Sodium Discuss
- 9. Removal of oil and grease from sewage [waste water]
Options- A. Skimming
- B. Filtration
- C. Screening
- D. None of the above Discuss
- 10. Phosphorus is kept in water because
Options- A. its ignition temperature is very high
- B. its ignition temperature is very low
- C. its critical temperature is high
- D. its critical temperature is low Discuss
Chemistry problems
Search Results
Correct Answer: Chlorine
Correct Answer: Sr
Explanation:
We know that, elements in the same group of the periodic table have similar characteristics. Here magnesium and strontium are the same 2nd group elements and have same behavior.
Therefore, strontium behaves same as magnesium.
Correct Answer: NaCl (Aq)
Explanation:
Mixtures are combination of two or more substances physically which can be separated in to the original.
Matter can be breakdown into two categories.
1) Pure substances
2) Mixtures
Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.
Correct Answer: Oxygen
Explanation:
Oxygen is the final electron acceptor of cellular respiration.
Correct Answer: a nonpolar molecule with polar bonds
Explanation:
The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar.
When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.
Correct Answer: H-F
Explanation:
Ionic character depends on the electronegativity difference between the bonding elements. The greatest the elctronegativity diffference the greatest the ionic character.
Here in the given options, H-F has has the greatest ionic character. The electronegativity of Hydrogen is 2.1 and that of Fluorine is 4. Now the electronegativity difference is 4 - 2.1 = 1.9.
Correct Answer: Poly carbonates
Correct Answer: Oxygen
Explanation:
Electronegativity measures an element's ability to form chemical bonds. Helium is the most electronegative element followed by Fluorine.
Here in the given options, Oxygen is the most electronegative element. Fluorine is followed by Oxygen, Chlorine and Nitrogen is the most electronegative elements list.
Correct Answer: Skimming
Explanation:
Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.
Correct Answer: its ignition temperature is very high
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