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- Question
Which of the properties of the element is a whole number
Options- A. atomic mass
- B. atomic number
- C. atomic radius
- D. atomic volume
- Correct Answer
- atomic number
- 1. The number of neutrons in dipositive Zinc ion is
Options- A. 34
- B. 36
- C. 38
- D. 40 Discuss
- 2. Which of the following is a regenerated fibre?
Options- A. Terylene
- B. Rayon
- C. Nylon
- D. Silk Discuss
- 3. 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 Discuss
- 4. 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
- 5. Which is the only gem of world made of a single element?
Options- A. Platinum
- B. Diamond
- C. Emerald
- D. Ruby Discuss
- 6. 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
- 7. 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
- 8. Which of the following describes the process of glycolysis?
Options- A. It represents the first stage in the chemical oxidation of glucose by a cell.
- B. Breakdown of Glucose
- C. Converts Glucose to Pyruvate
- D. All the above Discuss
- 9. The magnetic moment (spin only) of [NiCl4]2- is
Options- A. 1.41 BM
- B. 1.82 BM
- C. 5.46 BM
- D. 2.82 BM Discuss
- 10. Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at ?6°C will be: (Kf for water = 1.86 Kg/mol and molar mass of ethylene glycol = 62 kg/mol)
Options- A. 204.60 g
- B. 304.30 g
- C. 804.32 g
- D. 400.00 g Discuss
Chemistry problems
Search Results
Correct Answer: 40
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: atomic number
Explanation:
Atomic 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.
Correct Answer: Avogadro's law
Correct Answer: Diamond
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.
Correct Answer: All the above
Correct Answer: 2.82 BM
Explanation:
Hybridisation of Ni is
Unpaired in is 2
So
Correct Answer: 804.32 g
Explanation:
for ethylene glycol in aq. solution
=> w = 800 g
So, the weight of solute should be more than 800 g.
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