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- Question
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
- Correct Answer
- Na + Cl ? NaCl
ExplanationWhen 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).
- 1. Which metal pollute the air of a big city?
Options- A. Chromium
- B. Lead
- C. Copper
- D. Zinc Discuss
- 2. 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
- 3. Which compound is an electrolyte?
Options- A. HCl
- B. NaCl
- C. HBr
- D. All of the above Discuss
- 4. Alcohol is a stimulant. true or false
Options- A. TRUE
- B. FALSE Discuss
- 5. Stoichiometry is based on
Options- A. Law of conservation of energy
- B. Law of conservation of mass
- C. Newton's 1st law
- D. Kepler's law Discuss
- 6. The chemical name of common salt is
Options- A. Sodium Chloride
- B. Potassium Nitrate
- C. Sodium Nitrate
- D. Potassium Chloride Discuss
- 7. Which is a compound that contains carbon?
Options- A. Ethane
- B. Propane
- C. Methane
- D. All of the above Discuss
- 8. 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 Discuss
- 9. Monazite is an ore of
Options- A. Platinum
- B. Radium
- C. Uranium
- D. Lanthanum Discuss
- 10. Which process is a chemical change?
Options- A. Burning gasoline
- B. Boiling water
- C. Evaporating water
- D. Melting ice Discuss
Chemistry problems
Search Results
Correct Answer: Lead
Correct Answer: 7.35 - 7.45
Correct Answer: All of the above
Explanation:
A substance that dissociates into ions in solution and acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, and phosphate are examples of electrolytes, informally known as lytes.
Correct Answer: FALSE
Explanation:
Alcohol is a drug.
Correct Answer: Law of conservation of mass
Explanation:
Stoichiometry is a branch of chemistry deals with the calculations on reactants and products. It is based on the Law of conservation of mass where total mass of reactants is equal to total mass of products.
Correct Answer: Sodium Chloride
Explanation:
The chemical name of common salt is Sodium Chloride with a chemical formula NaCl.
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: Cutting very hard substances
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.
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