CODP D-group

For dissolution of direct dyes, precaution to be taken ---

• Add equal amount of soda ash of weight of dye

• Slowly add hot water

• Stir the solution rigorously

• All of these

If 1kg of dry fabric is padded with dye solution and weight found to be 1.8kg, then expression would be________%.

• 80

• 18

• 36

• 90

Highest salt required for exhaustion is for _______dyeing

• a. reactive

• b. direct

• c. azoic

• d. disperse

Effect of temperature on exhaustion during dyeing is

• A. Directly proportional

• B. Inversely proportional

• C. Negligible

• D. Observed only at boil

Water softening agents form complex with hardness cations is known as

• a. Aggregation

• b. Chelation

• c. Sedimentation

• d. Precipitation

As the pressure of padding mangle increases the expression would

• A. Increase

• B. Decrease

• C. Remain constant

• D. None of above

The derivatives of aromatic hydrocarbons in which one or more ring H atoms have been replaced by -NO2 group are called as

• A. Aromatic Nitro Compounds.

• B. Aromatic Amino Compounds.

• C. Aromatic Nitroso Compounds.

• D. None of these.

Common salt and Glauber salt can be written as

• A. NaCl and Na2S

• B. NaCl and NaOCl

• C. NaCl and KCl

• D. NaCl and Na2SO4

Oleum is

• A. Conc. H2SO4 + SO3.

• B. Conc. HCl + SO3.

• C. Conc. H2SO4 + Conc. HNO3.

• D. Nitrating mixture.

Which of the following is correct term refers to the dye taken for dyeing expressed in percentage on dry weight of fabric.

• A. Percent Expression

• B. Percent Exhaustion

• C. Percent Shade

• D. percent pickup