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- Question
The outer electron configuration of Gd (Atomic No : 64) is 1. 4f75d16s2 2. 4f35d56s2 3. 4f85d06s2 4. 4f45d46s2
- Correct Answer
- : 1 Sol : 1 4f75d16s2
- 1. Atoms Are Composed Of
Options- A. Electrons and Protons
- B. Protons and Nuclei
- C. Only Electrons
- D. Electrons and Nuclei Discuss
- 2. Who is the father of modern chemistry?
Options- A. Priestley
- B. Lavoisier
- C. Dalton
- D. Mendeleeff Discuss
- 3. The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ?
Options- A. 4th
- B. 2nd
- C. 3rd
- D. 1st Discuss
- 4. Positive ions are formed from neutral atoms by loss of
Options- A. neutrons
- B. protons
- C. nuclear charge
- D. electrons Discuss
- 5. The difference between a nuclear reactor and atomic bomb is that ___________
Options- A. no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction
- B. the chain reaction in nuclear reactor is controlled
- C. the chain reaction in nuclear reactor is not controlled
- D. no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor Discuss
- 6. Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? (1) K2O
Options- A. Option 1
- B. Option 2
- C. Option 3
- D. Option 4
Discuss
Correct Answer: Option 2
Explanation:
While moving from left to right in periodic table basic character of oxide of elements will decrease.
and while descending in the group basic character of corresponding oxides increases.
- 7. Which one of the following is used to induce artificial rain ?
Options- A. Potassium Nitrate
- B. Ammonium chloride
- C. Calcium carbonate
- D. Silver lodide Discuss
- 8. Which of the following is also known as Carbolic Acid?
Options- A. Hydroxide
- B. Sulphuric Acid
- C. Ethanol
- D. Phenol Discuss
- 9. Steel contains
Options- A. no carbon
- B. < 2% of carbon
- C. > 10% of carbon
- D. > 29% of carbon Discuss
- 10. The fundamental particles present in equal numbers in neutral atoms are
Options- A. protons and electrons
- B. neutrons and electrons
- C. protons and neutrons
- D. protons and positrons Discuss
Chemistry problems
Search Results
Correct Answer: Electrons and Nuclei
Explanation:
Atoms are composed of Electrons, protons and Neutrons. Protons and Neutrons together called as Nuclei.
Correct Answer: Lavoisier
Correct Answer: 2nd
Explanation:
RNA has hydroxy group attached at the 2nd C-atom while DNA does not.
Correct Answer: electrons
Correct Answer: the chain reaction in nuclear reactor is controlled
Correct Answer: Silver lodide
Correct Answer: Phenol
Explanation:
Phenol with a molecular formula [C6H5OH] is also called as Carbolic Acid. It is a white poisonous clear compound with sweet smell. It is used in making plastics, detergents and drugs.
Correct Answer: < 2% of carbon
Explanation:
To make steel, iron ore is first mined from the ground. It is then smelted in blast furnaces where the impurities are removed and carbon is added.
In simple, steel is iron alloyed with carbon, usually 0 - 2%.
Correct Answer: protons and electrons
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