Chemical Reactions and equations

________ of electrons is oxidation.

Tags

NGSS.HS-PS1-2

Electrolysis of water is a decomposition reaction. The molar ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

• 1:1

• 2:1

• 1:2

• 4:1

Tags

NGSS.HS-PS1-7

What is observed when a solution of potassium iodide is added to silver nitrate solution?

• No reaction takes place

• White precipitate of silver iodide is formed

• Yellow precipitate of AgI is formed

• AgI is soluble in water

Tags

NGSS.HS-PS1-2

The oxidizing agent in the following reaction is _________

CuO + H₂ -->Cu + H₂O

Tags

NGSS.HS-PS1-2

Rusting of iron is a physical change.

• True

• False

CaO + H₂O --> Ca(OH)₂

This is an example of

• Combination reaction

• Decomposition reaction

• Displacement reaction

• None of the above

The process of wasting away of metals on exposure to moist air is called ____________.

Tags

NGSS.HS-ESS2-5

Assertion: AgBr is used on photographic and X – ray film.

Reason: AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

• Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

• The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

• Assertion is true but the reason is false.

• The statement of the Assertion is false but the Reason is true.

Tags

NGSS.HS-PS1-2

Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.

Reason: Zinc reacts with oxygen to form zinc oxide.

• Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

• Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

• Assertion is true but the reason is false.

• The statement of the Assertion is false but the Reason is true.

Corrosion of iron is known as ________________.