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- Question
Which gas contributes most to the Greenhouse effect?
Options- A. Water vapour
- B. Ozone
- C. Oxygen
- D. Nitrogen
- Correct Answer
- Water vapour
- 1. Rusting is _____.
Options- A. Electrolysis
- B. Oxidation
- C. Redox reaction (Oxidation and Reduction)
- D. Reduction Discuss
- 2. Which of the follow is the last element in Newlands Law of Octaves classification?
Options- A. Rhodium
- B. Radium
- C. Iron
- D. Thorium Discuss
- 3. By which of the following processes are metals of high reactivity extracted from purified molten ore?
Options- A. Reduction by an appropriate reducing agent
- B. Roasting
- C. Electrolysis
- D. Calcination Discuss
- 4. Which of the following statements about the reaction below are INCORRECT? 2Pb + C ? 2Pb + CO2 A. Carbon di-oxide is getting, oxidised B. Lead is getting reduced C. Carbon is oxidised D. Lead oxide is getting reduced
Options- A. A and C
- B. A and B
- C. B and C
- D. A, B and C Discuss
- 5. A solution contains 33 g of common salt in 320 g of water. Calculate the concentration in terms of mass, by mass percentage of the solution.
Options- A. 13.05%
- B. 9.09 g
- C. 9.35g
- D. 9.35% Discuss
- 6. Constantan is alloyed from ...... metals.
Options- A. Ni, Ti, Fe, Cr
- B. Cu, Ni, Mn
- C. Ni, Cr, Mn, Fe
- D. Cu, Ni Discuss
- 7. 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
- 8. 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 Discuss
- 9. In the following reaction, fill in the blank. Acid + Base ? _______ + Water
Options- A. Carbon dioxide
- B. Metal Oxide
- C. Hydrogen Gas
- D. Salt Discuss
- 10. pH of the human blood is ______.
Options- A. Slightly Acidic
- B. Highly Acidic
- C. Slightly Basic
- D. Highly Basic Discuss
Chemistry problems
Search Results
Correct Answer: Redox reaction (Oxidation and Reduction)
Correct Answer: Thorium
Correct Answer: Electrolysis
Correct Answer: A and B
Correct Answer: 9.35%
Correct Answer: Cu, Ni
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: 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.
Correct Answer: Salt
Correct Answer: Slightly Basic
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