Discussion
Home ‣ General Knowledge ‣ Chemistry Comments
- Question
According to the modern Periodic Law, the properties of elements are periodic functions of their
Options- A. volency
- B. atomic mass
- C. number of neutrons
- D. atomic number
- Correct Answer
- atomic number
ExplanationAtomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.
- 1. 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
- 2. Which is the only gem of world made of a single element?
Options- A. Platinum
- B. Diamond
- C. Emerald
- D. Ruby Discuss
- 3. Which element is not a part of a nitrogenous base?
Options- A. Carbon
- B. Oxygen
- C. Phosphorous
- D. Nitrogen Discuss
- 4. Which one of the following is an element?
Options- A. Topaz
- B. Rruby
- C. Diamond
- D. Sapphire Discuss
- 5. NH3 oxidation number?
Options- A. -1
- B. +1
- C. 0
- D. -3 Discuss
- 6. Which of the following is a regenerated fibre?
Options- A. Terylene
- B. Rayon
- C. Nylon
- D. Silk Discuss
- 7. The number of neutrons in dipositive Zinc ion is
Options- A. 34
- B. 36
- C. 38
- D. 40 Discuss
- 8. Which of the properties of the element is a whole number
Options- A. atomic mass
- B. atomic number
- C. atomic radius
- D. atomic volume Discuss
- 9. Who present the theory of radioactive disintegration
Options- A. Rutherford and Soddy
- B. Soddy and Fajan
- C. Thomson and Rutherford
- D. Hahn and strassman Discuss
- 10. Which solution has the highest pH?
Options- A. 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)
- B. 50.0 mL 0.0500 M sodium hydroxide, NaOH (aq)
- C. 50.0 mL 0.0500 M nitric acid, HNO3 (aq)
- D. 50.0 mL 0.0500 M nitrous acid, HNO2 (aq) Discuss
Chemistry problems
Search Results
Correct Answer: Avogadro's law
Correct Answer: Diamond
Correct Answer: Phosphorous
Explanation:
A nitrogenous base is an element that contains nitrogen that have same chemical properties of the base.
Correct Answer: Diamond
Explanation:
Here in the given options, Diamond is an element as it is the allotrope of the carbon atom.
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: Rayon
Explanation:
Terylene and nylon are synthetic fibres produced by a process of polymerisation. Terylene is a polyester and nylon, a poyamide.
Silk is purely a natural product obtained from silk worms.
Rayon is a man-made material which consists of purified cellulose in the form of long fibres. Cellulose occurs in the cell wall of plants. Rayon fibre is chemically identical to cotton but has a shine like silk. Since it is basically derived from a natural source (cellulose) it is called a regenerated fibre.
Correct Answer: 40
Correct Answer: atomic number
Correct Answer: Rutherford and Soddy
Correct Answer: 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)
Explanation:
50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) has the highest pH value.
Sodium hydroxide and Calcium hydroxide are strong bases so they completely ionize in solution. Because they ionize at the same rate, and Calcium hydroxide has the higher pH calculated, then Calcium hydroxide, in fact, has the highest pH.
Nitric acid is a strong acid, so it completely ionizes in water. Whilst nitrous acid is a weak acid. Therefore, the nitric acid solution has the LOWEST ph.
Comments
There are no comments.More in General Knowledge:
Programming
Copyright ©CuriousTab. All rights reserved.