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- Question
Bullet proof material is made up of which polymer?
Options- A. Poly carbonates
- B. Poly vinyl
- C. Poly amides
- D. Polychloride
- Correct Answer
- Poly carbonates
- 1. Which bond has the greatest ionic character?
Options- A. H-F
- B. H-Cl
- C. H-N
- D. H-O Discuss
- 2. 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 Discuss
- 3. What element is used to disinfect swimming pools?
Options- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Sulphur Discuss
- 4. What element behaves most like magnesium?
Options- A. Sr
- B. S
- C. Si
- D. Sn Discuss
- 5. Which sample of matter is a mixture?
Options- A. KBr (S)
- B. NaCl (L)
- C. K (S)
- D. NaCl (Aq) Discuss
- 6. The most electronegative element among the following is
Options- A. Oxygen
- B. Chlorine
- C. Nitrogen
- D. Sodium Discuss
- 7. Removal of oil and grease from sewage [waste water]
Options- A. Skimming
- B. Filtration
- C. Screening
- D. None of the above Discuss
- 8. 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
- 9. All isotopes of the same element have ____________
Options- A. different atomic numbers and different atomic mass
- B. different atomic numbers and the same atomic mass
- C. the same atomic number but different atomic masses
- D. the same atomic number and the atomic mass Discuss
- 10. Nitric acid does not react with
Options- A. Gold
- B. Copper
- C. Zinc
- D. Iron Discuss
Chemistry problems
Search Results
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: ATP to ADP
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:
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
Correct Answer: the same atomic number but different atomic masses
Correct Answer: Gold
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