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- Question
The atoms of the elements having same atomic number but different mass number are called
Options- A. Isobar
- B. Isotopes
- C. Iso electronic
- D. Isotones
- Correct Answer
- Isotopes
- 1. The atoms of the elements which have same number of neutrons are called
Options- A. Isobars
- B. Isotopes
- C. Isotones
- D. None Discuss
- 2. Artificial radioactivity elements are present in
Options- A. s - block
- B. p - block
- C. d - block
- D. f - block Discuss
- 3. A bond formed by the transfer of electrons between atoms of the elements is called
Options- A. Ionic bond
- B. Covalent bond
- C. Co-ordinate bond
- D. Hydrogen bond Discuss
- 4. Leakage in LP gas cylinders is easily detected by adding
Options- A. mercaptans
- B. propylene
- C. carbon disulphide
- D. phosgene Discuss
- 5. Which of the following is called 'the King of Chemicals' ?
Options- A. Nitric acid
- B. Hydrochloric acid
- C. Silver nitrate
- D. Sulphuric acid Discuss
- 6. Ozone is concentrated in the
Options- A. Stratosphere
- B. Troposphere
- C. Ionosphere
- D. Mesosphere Discuss
- 7. What is the bond order of N2+?
Options- A. 3
- B. 1.5
- C. 2.5
- D. 2 Discuss
- 8. Most commonly used bleaching agent is
Options- A. Chlorine
- B. Alcohol
- C. Carbon dioxide
- D. Sodium Chloride Discuss
- 9. which of the following are chemical changes? A) Cooking of Food B) Digestion of Food C) Freezing of water D) Water is heated up
Options- A. A & B
- B. A, B & C
- C. C & D
- D. All the above Discuss
- 10. PAS is a drug used in the treatment of
Options- A. Cancer
- B. Typhoid
- C. Malaria
- D. Tuberculosis Discuss
Chemistry problems
Search Results
Correct Answer: Isotones
Correct Answer: f - block
Correct Answer: Ionic bond
Correct Answer: mercaptans
Explanation:
mercaptans (or thioalcohols) have a foul odour
Correct Answer: Sulphuric acid
Explanation:
Sulphuric acid is called the King of Chemicals because it is used in the preparation of a very large number of other useful chemicals such as hydrochloric acid, nitric acid, dyes, drugs etc. In fact the annual production of shulpuric acid in a country is a measure of the economy of the country.
Correct Answer: Stratosphere
Explanation:
Most of the ozone in the atmosphere is found in the layer of stratosphere, which begins about 10.16 kilometers (6.10 miles) above Earth's surface and extends up to about 50 kilometers (31 miles) altitude.
Correct Answer: 2.5
Explanation:
Bond Order = 1/2[ Nb - Na]
where
Nb = Number of electrons in bonding molecular orbitals.
Na = Number of Electrons in antibonding molecular orbitals
Bond Order of N2?:
Total number of electrons: 13
Electronic Configuration= :?1s² ?*1s² ?2s² ?*2s² ? 2py² [?2pz² ?2px1 ]
Bond Order = [9-4]/2 = 5/2 = 2.5.
Correct Answer: Chlorine
Explanation:
Chlorine is the most commonly used bleaching agent.
Bleaching agents are compounds which are used to remove color from substances such as textiles. A bleaching agent is a material that lightens or whitens a substrate through the chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems.
Correct Answer: A & B
Explanation:
A) Cooking of Food ------ Chemical Change
B) Digestion of Food ----- Chemical Change
C) Freezing of water ----- Physical Change
D) Water is heated up ---- Physical Change
because here the chemical composition of the substance changes in A & B only.
Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.
Correct Answer: Tuberculosis
Explanation:
Para-amino salicylic acid (PAS) is used in the treatment of Tuberculosis.
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