Chemistry problems
- 1. Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?
Options- A. Amino acid
- B. Sulfur
- C. Carbon
- D. Fat Also asked in: AIEEE, Bank Exams, CAT, Bank Clerk, Bank PO
Correct Answer: Sulfur
Explanation:
Cutting and Peeling of onion brings Tears to the eyes because of presence of Sulphur in the cell.
- 2. Is C2 Paramagnetic or Diamagnetic?
Options- A. Paramagnetic
- B. Diamagnetic
- C. Ferromagnetic
- D. Can't be determined Also asked in: CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst
Correct Answer: Diamagnetic
- 3. Permanent hardness of water is due to the presence of ?
Options- A. Calcium sulphate
- B. Calcium bicarbonate
- C. Sodium bicarbonate
- D. Magnesium bicarbonate Also asked in: AIEEE, Bank Exams, Bank Clerk
Correct Answer: Calcium sulphate
- 4. Species containing same number of electrons are called
Options- A. Isotopes
- B. Isobars
- C. Isoelectronic
- D. Isotones Discuss
Correct Answer: Isoelectronic
- 5. Electron configuration of cobalt 2+? Also asked in: Analyst
Correct Answer: The s,p,d,f configuration for cobalt (Co) is 1s22s22p63s23p64s23d7, determined by the position of the element on the periodic table The electron configuration for Cobalt at ground state would simply be Co: [Ar] 4s23d7 The electron configuration of Cobalt will end in d block as Cobalt is an inner transition metal Cobalt is in the 7th column of the d block and therefore has 7 d electrons d7
- 6. Which is the gas used for making vegetables and vanaspathi from vegetable oils?
Options- A. Hydrogen
- B. Nitrogen
- C. Argon
- D. Helium Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Hydrogen
Explanation:
Hydrogen gas is used for making vegetables and vanaspathi from vegetable oils.
As it is colourless, odourless, tasteless, flammable gaseous substance, it is added to oils to make them more solid or spreadable.
The use of hydrogenation helps to prolong the shelf life of the food and maintain flavour stability.
- 7. Gold and silver are extracted from their respective ores by _______
Options- A. Smelting
- B. Roasting
- C. Leaching
- D. Hydro metallurgy Discuss
Correct Answer: Hydro metallurgy
- 8. The Kinetic energy of gas molecules
Options- A. is unaffected by temperature variations
- B. decreases with increase of temperature
- C. increases with decrease of temperature
- D. increases with increase of temperature Also asked in: AIEEE
Correct Answer: increases with increase of temperature
Explanation:
Kinetic Energy or
, Where 'm' is the mass and 'v' is the velocity of molecules.
Velocity is proportional to temperature. Hence, KE is proportional to temperature and would increase with temperature.
- 9. Which of the following is the strongest acid?
Options- A. ClCH2COOH
- B. BrCH2COOH
- C. FCH2COOH
- D. ICH2COOH Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
Correct Answer: FCH2COOH
- 10. Which Noble Gas has the highest First Ionization Energy?
Options- A. Neon
- B. Helium
- C. Argon
- D. Xenon Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Helium
Explanation:
Helium has the highest First Ionization Energy in the Noble Gases group.
Ionization Energy ::
Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells.
Noble Gases have a very stable electron configuration, therefore, they have the highest amount of ionization energy within their periods. It decreases down a family because electrons farther from the nucleus are easier to remove.
Ionization Energy levels of Noble Gases group in Descending Order :: He, Ne, Ar, Kr, Xe, Rn
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