Deionised water is produced by

• Calgon process

• ion-exchange resin process

• Clark's process

• Permutit process

Which one among the following is a double salt?

• K₄[Fe(CN)₆]

• K₂SO_4.Al₂(SO₄)_3.24H₂0

• CuSO₄.5H₂O

• NaCl

Which one among the following is the correct order the strength of acids?

• H₂SO₄ > H₃PO₃> CH₃COOH

• H₂PO₃> H₂SO₄> CH₃COOH

• CH₃COOH > H₃PO₃ > H₂SO₄

• CH₃COOH > H₂SO₄ > H₃PO₃

194.

Given below is an approximate composition of a substance:

CaO: 60-70%

SiO₂: 20-25%

Al₂O₃: 5-10%

Fe₂O₃: 2-3%

The substance is

• Plaster of Paris

• Cement

• Marble stone

• Quartz

In KMnO₄ molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively

• +1,+5,-2

• +1,+7,-2

• 0,0,0

• +1, +7, 0

Examine the statements and select the appropriate answer.

Statement I: The blue color of copper sulphate crystal disappears when it is heated strongly.

Statement II: Due to heating, the water of crystalization of the crystal is lost.

• Both the statements are individually true and Statement II is the correct explanation of Statement I

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Examine the statements and select the appropriate answer.

Statement I: After cutting an apple or a banana, the color of the cut surface becomes brown.

Statement II: Polyphenolic compounds present in fruits get oxidized in the air and show color.

• Both the statements are individually true and Statement II is the correct explanation of Statement I

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Examine the statements and select the appropriate answer.

Statement I: At high temperatures, hyd-rogen can reduce PbO to elemental lead.

Statement II: Hydrogen has a great affinity to oxygen.

• Both the statements are individually true and Statement II is the correct explanation of Statement I

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Examine the statements and select the appropriate answer.

Statement I: Conversion of blue copper sulphate to black cupric oxide on heating is a physical change.

Statement II: A change in which chemical composition does not change is called a physical change.

• Both the statements are individually true and Statement II is the correct explanation of Statement I

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Examine the statements and select the appropriate answer.

Statement I: Water is a high boiling point liquid.

Statement II: Hydrogen bonding in water is responsible for the high boiling point of water

• Both the statements are individually true and Statement II is the correct explanation of Statement I

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true