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- Question
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
- Correct Answer
- the same atomic number but different atomic masses
- 1. 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
- 2. Removal of oil and grease from sewage [waste water]
Options- A. Skimming
- B. Filtration
- C. Screening
- D. None of the above Discuss
- 3. The most electronegative element among the following is
Options- A. Oxygen
- B. Chlorine
- C. Nitrogen
- D. Sodium Discuss
- 4. Bullet proof material is made up of which polymer?
Options- A. Poly carbonates
- B. Poly vinyl
- C. Poly amides
- D. Polychloride Discuss
- 5. Which bond has the greatest ionic character?
Options- A. H-F
- B. H-Cl
- C. H-N
- D. H-O Discuss
- 6. Nitric acid does not react with
Options- A. Gold
- B. Copper
- C. Zinc
- D. Iron Discuss
- 7. What is the common name of CaOCl2?
Options- A. Baking Powder
- B. Baking Soda
- C. Bleaching Powder
- D. Washing Soda Discuss
- 8. Activated Charcoal is used to remove colouring matter from pure substances by_______
Options- A. Bleaching
- B. Oxidation
- C. Adsorption
- D. Reduction Discuss
- 9. Nitrogen fixation is a process of
Options- A. Assimilation of nitrate
- B. Utilisation of nitrogen gas
- C. Conversion of organic nitrogen to proteins
- D. Conversion of molecular nitrogen to ammonia Discuss
- 10. The biogas used for cooking is a mixture of which of the following ?
Options- A. Carbon dioxide & oxygen
- B. Isobutane & propane
- C. Methane & carbon monoxide
- D. Methane & carbon dioxide Discuss
Chemistry problems
Search Results
Correct Answer: its ignition temperature is very high
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: 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: Poly carbonates
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: Gold
Correct Answer: Bleaching Powder
Correct Answer: Adsorption
Correct Answer: Conversion of organic nitrogen to proteins
Correct Answer: Methane & carbon dioxide
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