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- Question
Binomial Nomenclature was founded by
Options- A. Charles Darwin
- B. Robert Nucleus
- C. Carl Linnaeus
- D. Lamarck
- Correct Answer
- Carl Linnaeus
- 1. Which of the following statement(s) is/are CORRECT? I. Acids are sour in taste and generate H+ ions. II. Acids are sour in taste and generate OH? ions. III. Bases are bitter intaste and generate OH? ions.
Options- A. Only I and III
- B. Only I and II
- C. Only II and III
- D. All I, II and III Discuss
- 2. Which base is present in soap?
Options- A. Sodium hydroxide
- B. Silicon dioxide
- C. Calcium hydroxide
- D. Ammonium hydroxide Discuss
- 3. What is the process of rust forming on iron called?
Options- A. Rusting
- B. Crystallisation
- C. Shovel
- D. Spade Discuss
- 4. The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
Options- A. 10-20
- B. 30-35
- C. 40-50
- D. 60-70 Discuss
- 5. Vinegar and Baking Soda together produce ____________.
Options- A. Copper
- B. Carbon Dioxide
- C. Copper Sulphate
- D. Magnesium Oxide Discuss
- 6. Magnetite is an ore/mineral of
Options- A. Beryllium
- B. Chromium
- C. Iron
- D. Lead Discuss
- 7. The poisonous gas accidentally released in Bhopal Gas Tragedy is
Options- A. Methane
- B. Nitrous Oxide
- C. Methyl Isocyanate
- D. Cyanogen Discuss
- 8. The conversion of hard water into soft water by boiling or adding calcium hydroxide is called _______.
Options- A. Baker's process
- B. Temp's process
- C. Clarke's process
- D. Lake's process Discuss
- 9. Which of the following gases is produced due to incomplete combustion of fuel?
Options- A. Carbon Dioxide
- B. Carbon Monoxide
- C. Methane
- D. Ethane Discuss
- 10. Which of the following is the strongest base?
Options- A. LiCH3
- B. LiF
- C. LiOH
- D. LiNH2 Discuss
Chemistry problems
Search Results
Correct Answer: Only I and III
Correct Answer: Sodium hydroxide
Correct Answer: Rusting
Correct Answer: 30-35
Correct Answer: Carbon Dioxide
Correct Answer: Iron
Correct Answer: Methyl Isocyanate
Correct Answer: Clarke's process
Correct Answer: Carbon Monoxide
Correct Answer: LiCH3
Explanation:
The stability of the ions is determined by the energy of the lone pairs. Carbon has the least effective nuclear charge (Zeff) and so the lone pair on the CH3? ion has the highest energy, making it the least stable ion and so the strongest base. The Zeff increases as we move across the period until we get to fluorine which has the greatest Zeff and so its lone pairs have the lowest energy, making F? the least basic ion.
In order of decreasing basicity they are ranked LiCH3 > LiNH2 > LiOH > LiF. We are dealing with the ions F?, OH?, NH2? and CH3? and so the factor which influences their basicity is the stability of the ion compared to its conjugate acid.
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