Discussion
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- Question
What is the oxidation number of sulfur in H2S?
Options- A. 2
- B. -2
- C. 1
- D. -1
- Correct Answer
- -2
- 1. Silver Mirror test is given by which one of the following compounds? 1. Benzophenone 2. Acetaldehyde 3. Acetone 4. Formaldehyde
Options- A. Only 1
- B. Only 2
- C. 1 and 3
- D. 2 and 4 Discuss
- 2. Which one of the following is a natural colloid ?
Options- A. Cane sugar solution
- B. Blood
- C. Sodium chloride solution
- D. Urea solution Discuss
- 3. Which one among the following is the heaviest
Options- A. 1 mole of water molecules
- B. 1 mole of ammonia molecules
- C. 1 mole of sodium atoms
- D. 1 mole of hydrogen molecules Discuss
- 4. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
Options- A. dehydration
- B. oxidation
- C. reduction
- D. dehydrogenation Discuss
- 5. An element which is preserved under water is
Options- A. sodium
- B. sulphur
- C. red phosphorus
- D. white phosphorus Discuss
- 6. Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?
Options- A. Amino acid
- B. Sulfur
- C. Carbon
- D. Fat Discuss
- 7. Is C2 Paramagnetic or Diamagnetic?
Options- A. Paramagnetic
- B. Diamagnetic
- C. Ferromagnetic
- D. Can't be determined Discuss
- 8. Permanent hardness of water is due to the presence of ?
Options- A. Calcium sulphate
- B. Calcium bicarbonate
- C. Sodium bicarbonate
- D. Magnesium bicarbonate Discuss
- 9. Species containing same number of electrons are called
Options- A. Isotopes
- B. Isobars
- C. Isoelectronic
- D. Isotones Discuss
- 10. Electron configuration of cobalt 2+? Discuss
Chemistry problems
Search Results
Correct Answer: 2 and 4
Explanation:
Both Formaldehyde and Acetaldehyde will give this test
Correct Answer: Blood
Correct Answer: 1 mole of sodium atoms
Correct Answer: oxidation
Explanation:
Saw dust contains carbon which is oxidised to carbon dioxide by concentrated nitric acid;
Correct Answer: white phosphorus
Explanation:
White phosphorus undergoes spontaneous combustion when exposed to air. In order to prevent this spontaneous ignition, it is preserved under water.
Correct Answer: Sulfur
Explanation:
Cutting and Peeling of onion brings Tears to the eyes because of presence of Sulphur in the cell.
Correct Answer: Diamagnetic
Correct Answer: Calcium sulphate
Correct Answer: Isoelectronic
Correct Answer: The s,p,d,f configuration for cobalt (Co) is 1s22s22p63s23p64s23d7, determined by the position of the element on the periodic table The electron configuration for Cobalt at ground state would simply be Co: [Ar] 4s23d7 The electron configuration of Cobalt will end in d block as Cobalt is an inner transition metal Cobalt is in the 7th column of the d block and therefore has 7 d electrons d7
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