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- Question
In which of the following activities silicon carbide is used
Options- A. Disinfecting water of ponds
- B. Making casts for statues
- C. Making cement and glass
- D. Cutting very hard substances
- Correct Answer
- Cutting very hard substances
- 1. Which is a compound that contains carbon?
Options- A. Ethane
- B. Propane
- C. Methane
- D. All of the above Discuss
- 2. The chemical name of common salt is
Options- A. Sodium Chloride
- B. Potassium Nitrate
- C. Sodium Nitrate
- D. Potassium Chloride Discuss
- 3. Which equation is an example of a synthesis reaction?
Options- A. 2H2 + O2 ? 2H2O
- B. Na + Cl ? NaCl
- C. HA + BOH ? H2O + BA
- D. NaCl + AgNO3 ? NaNO3 + AgCl Discuss
- 4. Which metal pollute the air of a big city?
Options- A. Chromium
- B. Lead
- C. Copper
- D. Zinc Discuss
- 5. What is a normal pH level in blood?
Options- A. 7.35 - 7.45
- B. 7.45 - 7.55
- C. 7.6 - 7.7
- D. 7 - 7.10 Discuss
- 6. Monazite is an ore of
Options- A. Platinum
- B. Radium
- C. Uranium
- D. Lanthanum Discuss
- 7. Which process is a chemical change?
Options- A. Burning gasoline
- B. Boiling water
- C. Evaporating water
- D. Melting ice Discuss
- 8. Carbon disulfide is prepared by heating sulfur and charcoal.
Options- A. TRUE
- B. FALSE Discuss
- 9. Which formula represents a polar molecule?
Options- A. C - O
- B. C - N
- C. H - N
- D. All of the above Discuss
- 10. Which of the following is not a semiconductor?
Options- A. CdS
- B. NaCl
- C. Si
- D. Ge Discuss
Chemistry problems
Search Results
Correct Answer: All of the above
Explanation:
The compound methane is a simple hydrocarbon contains one carbon bonded to four hydrogens. Ethane is a simple hydrocarbon which contains two carbon atoms and four hydrogen atoms. Similarly, propane with three carbons.
Correct Answer: Sodium Chloride
Explanation:
The chemical name of common salt is Sodium Chloride with a chemical formula NaCl.
Correct Answer: Na + Cl ? NaCl
Explanation:
When two or more chemical species combine to form a single product, the reaction is said to be synthesis reaction. It is also called as Direct Combination reaction.
Here in the given options, Sodium (Na) combines with Chlorine (Cl) to form a more complex single product Sodium Chloride (NaCl).
Correct Answer: Lead
Correct Answer: 7.35 - 7.45
Correct Answer: Lanthanum
Explanation:
Monazite is an ore of cerium, thorium and lanthanum.
Correct Answer: Burning gasoline
Explanation:
Burning gasoline is the only process that involving in a chemical change in the given options. A chemical change is a change in the starting substances that are called reactants from the formed new substances that are called products.
Correct Answer: TRUE
Explanation:
Yes, Carbon disulfide is prepared by heating sulfur and charcoal.
S2 + C ----> CS2
Correct Answer: All of the above
Explanation:
A chemical bond in which the electrons are not shared equally due to differences in the electronegativity of the atoms.
The polarity of a covalent bond is measured using its dipole moment.
? Large dipole moment = more polar
? Small dipole moment = more nonpolar.
Correct Answer: NaCl
Explanation:
Semiconductors are those materials that are neither good conductors nor the good insulators of heat and electricity. Silicon (Si), Germanium (Ge) and Cadmium Sulphide (CdS) are semiconductors which work as conductors in some special conditions only.
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