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- Question
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
- Correct Answer
- Magnesium
ExplanationForms 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.
- 1. 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 Discuss
- 2. Constantan is alloyed from ...... metals.
Options- A. Ni, Ti, Fe, Cr
- B. Cu, Ni, Mn
- C. Ni, Cr, Mn, Fe
- D. Cu, Ni Discuss
- 3. Which gas contributes most to the Greenhouse effect?
Options- A. Water vapour
- B. Ozone
- C. Oxygen
- D. Nitrogen Discuss
- 4. Rusting is _____.
Options- A. Electrolysis
- B. Oxidation
- C. Redox reaction (Oxidation and Reduction)
- D. Reduction Discuss
- 5. Which of the follow is the last element in Newlands Law of Octaves classification?
Options- A. Rhodium
- B. Radium
- C. Iron
- D. Thorium Discuss
- 6. In the following reaction, fill in the blank. Acid + Base ? _______ + Water
Options- A. Carbon dioxide
- B. Metal Oxide
- C. Hydrogen Gas
- D. Salt Discuss
- 7. pH of the human blood is ______.
Options- A. Slightly Acidic
- B. Highly Acidic
- C. Slightly Basic
- D. Highly Basic Discuss
- 8. Which of the following is an Inert Gas?
Options- A. Hydrogen
- B. Nitrogen
- C. Oxygen
- D. Argon Discuss
- 9.
Options- A. Mineral
- B. Tribe
- C. Grass
- D. Town Discuss
- 10. Which among the following is not an example of emulsion?
Options- A. Chocolate-Milk
- B. Butter
- C. Whipped Cream
- D. Curd Discuss
Chemistry problems
Search Results
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.
Correct Answer: Cu, Ni
Correct Answer: Water vapour
Correct Answer: Redox reaction (Oxidation and Reduction)
Correct Answer: Thorium
Correct Answer: Salt
Correct Answer: Slightly Basic
Correct Answer: Argon
Correct Answer: Grass
Correct Answer: Curd
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