Chemistry problems
- 1. Constantan is alloyed from ...... metals.
Options- A. Ni, Ti, Fe, Cr
- B. Cu, Ni, Mn
- C. Ni, Cr, Mn, Fe
- D. Cu, Ni Also asked in: AIEEE, Bank Exams, CAT
Correct Answer: Cu, Ni
- 2. In case of a standard hydrogen electrode
Options- A. absolute electrode potential is not zero
- B. absolute electrode potential is zero
- C. both absolute and standard electrode potential values are zero
- D. electrode potential is zero only at 25 deg C Also asked in: Bank Exams
Correct Answer: absolute electrode potential is not zero
Explanation:
The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E0) is declared to be zero volts only at 298.
- 3. Which one of the following elements is essential for the formation of chlorophyll in green plants?
Options- A. Calcium
- B. Iron
- C. Magnesium
- D. Potassium Also asked in: Bank Exams
Correct Answer: Magnesium
Explanation:
Forms taken up by plants: Mg++ Functions in plants: a part of the chlorophyll molecule -essential in photosynthesis: related to phosphorus metabolism: large quantities found in seed.Mg deficiency symptoms: Mg is mobile, so symptoms occur first in old leaves; A whitish or yellowish striping effect on grasses.
- 4. In the following reaction, fill in the blank. Acid + Base ? _______ + Water
Options- A. Carbon dioxide
- B. Metal Oxide
- C. Hydrogen Gas
- D. Salt Also asked in: Bank Exams
Correct Answer: Salt
- 5. pH of the human blood is ______.
Options- A. Slightly Acidic
- B. Highly Acidic
- C. Slightly Basic
- D. Highly Basic Also asked in: Bank Exams
Correct Answer: Slightly Basic
- 6. Which of the following is an Inert Gas?
Options- A. Hydrogen
- B. Nitrogen
- C. Oxygen
- D. Argon Also asked in: Bank Exams
Correct Answer: Argon
- 7.
Options- A. Mineral
- B. Tribe
- C. Grass
- D. Town Also asked in: Bank Exams
Correct Answer: Grass
- 8. Which among the following is not an example of emulsion?
Options- A. Chocolate-Milk
- B. Butter
- C. Whipped Cream
- D. Curd Also asked in: Bank Exams
Correct Answer: Curd
- 9. Which one of the following is a physical change?
Options- A. Burning of coal
- B. Burning of wood
- C. Heating of a platinum crucible
- D. Heating of potassium chlorate Also asked in: Bank Exams
Correct Answer: Heating of a platinum crucible
Explanation:
In Burning of coal, burning of wood and Heating of Potassium Chlorate there will be some sort of chemical change, but Heating of a Platinum crucible is a physical change.
- 10. There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as
Options- A. isotones
- B. isochores
- C. isobars
- D. isotopes Also asked in: Bank Exams
Correct Answer: isobars
Explanation:
Isotopes-These are atoms of the elements having the same atomic number but different mass number., Isobars-These are atoms of same mass number but different atomic number., Isotones-These are atoms of different elements having same number of neutrons.
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