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- Question
Which one of the followingis notan allotrope of carbon?
Options- A. Coal
- B. Diamond
- C. Graphite
- D. Graphene
- Correct Answer
- Coal
ExplanationAllotropy is the property of some chemical elements to exist in two or more different forms, or allotropes, when found in nature. There are several allotropes of carbon like diamond, graphite, graphene, fullerene, etc.Coal is not an allotrope of carbon because it is not 100% carbon. It contains lot of silica, sulphur and other compounds of carbon apart from carbon.
- 1. Which of the following compounds from nitrites with nitrous acid?
Options- A. Primary amines
- B. Secondary amines
- C. Tertiary amines
- D. All of these Discuss
- 2. Which one of the following is an insulator?
Options- A. copper
- B. wood
- C. mercury
- D. aluminium Discuss
- 3. Zeolite is
Options- A. hydrated ferric oxide
- B. hydrated sodium aluminium silicate
- C. sodium hexameta phosphate
- D. sodium tetra borate Discuss
- 4. The most extensive use of molasses after fermentation is for producing
Options- A. Methanol
- B. Sugar
- C. Ethanol
- D. Sugarcane Discuss
- 5. Acid rain is caused due to pollution of atmosphere by
Options- A. oxides of nitrogen and sulphur
- B. oxides of nitrogen and phosphorous
- C. oxides of carbon and nitrogen
- D. oxides of nitrogen and methane Discuss
- 6. Bee sting contains________________
Options- A. An acidic liquid
- B. a salt solution
- C. an alkaline liquid
- D. a corrosive liquid Discuss
- 7. Which one of the following elements does not form solid hydrogen carbonate?
Options- A. Sodium
- B. Potassium
- C. Caesium
- D. Lithium Discuss
- 8. Highest percentage of carbon is found in which form of coal?
Options- A. Anthracite
- B. Bituminous
- C. Peat
- D. lignite Discuss
- 9. Which one of the following statements is correct?
Options- A. The oxidation number for hydrogen is always zero.
- B. The oxidation number for hydrogen is always + 1.
- C. The oxidation number for hydrogen is always -1.
- D. Hydrogen can have more than one oxidation number. Discuss
- 10. Match List -I with List -II and select the correct answer using the code given below the Lists : List -I List-II (Compound/Molecule) (Shape of Molecule) A. CH3F 1. Trigonal planar B. HCHO 2. Tetrahedral C. HCN 3. Trigonal pyramidal D. NH3 4. Linear
Options- A. 2 4 1 3
- B. 2 1 4 3
- C. 3 4 1 2
- D. 3 1 4 2 Discuss
Chemistry problems
Search Results
Correct Answer: All of these
Explanation:
The acid and the nitrite form nitrous acid which then reacts with the amine.
Correct Answer: wood
Correct Answer: hydrated sodium aluminium silicate
Correct Answer: Ethanol
Correct Answer: oxides of carbon and nitrogen
Correct Answer: An acidic liquid
Correct Answer: Lithium
Explanation:
Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate) is the inorganic compound with the chemical formula KHCO3. It is a white solid
Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.
LiHCO3 is found in solution form while rest alkali metals hydrogen carbonates are solid due to the anomalous properties of Li and its diagonal relationship with the Mg.
Correct Answer: Anthracite
Correct Answer: Hydrogen can have more than one oxidation number.
Explanation:
Hydrogen has two possible oxidation numbers: +1 and -1.
-1 in case of hydrides.
Correct Answer: 2 1 4 3
Explanation:
HCHO: The carbon and and the oxygen are bonded through a double bond which counts as "one electron pair". Hence the molecule has three electron pairs and is trigonal planar.
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