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Q:
With which substance is it beneficial to treat a bee sting?
838 0

Answer : 1. "Baking Soda"

Q:
Sodium chloride and water are formed by the reaction of sodium hydroxide and hydrochloric acid. What is this reaction?
837 0

Answer : 1. "neutralization"

Q:
The litmus dye is purple in color, which is removed?
828 0

Answer : 2. "Lichen"

Q:
Which metal does not react with oxygen even at high temperature?
821 0

Answer : 2. "gold"

Q:
Which metal can be cut with a knife among sodium, lithium, calcium and nickel?
819 0

Answer : 1. "Sodium"
Explanation :
Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.

Q:
Gas is produced by the reaction of steam on iron?
812 0

Answer : 1. "Hydrogen gas"

Q:
Which of the following reactions always have pairs together?
812 0

Answer : 4. "Oxidation and degradation"

Q:
On heating copper powder in air, a layer of copper oxide accumulates on its surface. What is the color of this layer?
808 0

Q: With which substance is it beneficial to treat a bee sting? 838 05feb05e8f33a00432afefd0e

Answer : 1. "Baking Soda"

Q: Sodium chloride and water are formed by the reaction of sodium hydroxide and hydrochloric acid. What is this reaction? 837 05f698f9a558d255013b2b659

Answer : 1. "neutralization"

Q: The litmus dye is purple in color, which is removed? 828 05f697e9cf9079a64e3a51e91

Answer : 2. "Lichen"

Q: Which metal does not react with oxygen even at high temperature? 821 0612759fb302e8b067c99a4be

Answer : 2. "gold"

Q: Which metal can be cut with a knife among sodium, lithium, calcium and nickel? 819 061275c2293f02206607ea973

Answer : 1. "Sodium" Explanation :Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.

Q: Gas is produced by the reaction of steam on iron? 812 0612765e4b05363065a00aedf

Answer : 1. "Hydrogen gas"

Q: Which of the following reactions always have pairs together? 812 05f698f46558d255013b2b2b6

Answer : 4. "Oxidation and degradation"

Q: On heating copper powder in air, a layer of copper oxide accumulates on its surface. What is the color of this layer? 808 05f697a06f9079a64e3a50c7f

Answer : 1. "Black"

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Q:
With which substance is it beneficial to treat a bee sting?
838 0

Q:
Sodium chloride and water are formed by the reaction of sodium hydroxide and hydrochloric acid. What is this reaction?
837 0

Q:
The litmus dye is purple in color, which is removed?
828 0

Q:
Which metal does not react with oxygen even at high temperature?
821 0

Q:
Which metal can be cut with a knife among sodium, lithium, calcium and nickel?
819 0

Answer : 1. "Sodium"
Explanation :
Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.

Q:
Gas is produced by the reaction of steam on iron?
812 0

Q:
Which of the following reactions always have pairs together?
812 0

Q:
On heating copper powder in air, a layer of copper oxide accumulates on its surface. What is the color of this layer?
808 0