1.
Laundry operations often add alkalies in the wash water to make detergents more effective in cleaning linens. However, if alkalies remain in the fabric after washing and ironing, fibers can be damaged and linens could yellow and fade. Which of the following chemicals are used near the end of the wash cycle to neutralize any residual alkalinity in fabrics?
Correct Answer
C. Sours
Explanation
Sours are used near the end of the wash cycle to neutralize any residual alkalinity in fabrics. Alkalies are added in the wash water to enhance the cleaning power of detergents, but if they remain in the fabric after washing and ironing, they can cause damage to the fibers and cause yellowing and fading of the linens. Sours help to balance the pH levels and remove any remaining alkalies, ensuring that the fabric is safe and free from any residual chemicals.
2.
Which of the following chemicals used in laundry operations helps detergents lather better and keep stains suspended in the wash water after they have been loosened and lifted from the fabric?
Correct Answer
D. Alkalies
Explanation
Alkalies are chemicals used in laundry operations that help detergents lather better and keep stains suspended in the wash water after they have been loosened and lifted from the fabric. Alkalies work by increasing the pH level of the water, which enhances the cleaning power of the detergent and improves its ability to remove dirt and stains. By keeping the stains suspended in the water, alkalies prevent them from re-depositing onto the fabric during the wash cycle, resulting in cleaner and brighter laundry.
3.
Which of the following chemicals are used in laundry operations specifically to prevent the growth of bacteria and fungus on linens?
Correct Answer
B. Mildewcides
Explanation
Mildewcides are chemicals specifically used in laundry operations to prevent the growth of bacteria and fungus on linens. They are designed to kill or inhibit the growth of mildew, which is a type of fungus that can cause stains, odors, and deterioration on fabrics. By using mildewcides in laundry operations, the linens can be effectively protected from bacterial and fungal growth, ensuring cleanliness and hygiene.
4.
Which of the following statements about bleaches used in the wash cycle of the laundry operation is false?
Correct Answer
B. Chlorine bleach is milder than oxygen bleach.
Explanation
Chlorine bleach is not milder than oxygen bleach. In fact, chlorine bleach is generally stronger and more harsh than oxygen bleach. Chlorine bleach is a powerful disinfectant and stain remover, but it can also be damaging to fabrics and colors if not used properly. Oxygen bleach, on the other hand, is a gentler alternative that is safe for most fabrics and colors. It is effective in removing organic stains and is often recommended for use in cold water. Therefore, the statement that chlorine bleach is milder than oxygen bleach is false.
5.
Which of the following statements about detergents used in laundry operations is false?
Correct Answer
A. Neutral or pure soaps are used primarily for heavy soiled fabrics.
6.
List the type of chemical described in questions 6 through 10. Help detergents lather better and keep stains suspended in the wash water.
Correct Answer
A. Alkalies
Explanation
Alkalies are the type of chemical described in questions 6 through 10. They help detergents lather better and keep stains suspended in the wash water.
7.
List the type of chemical described in questions 6 through 10. Help remove stains, kill bacteria, and whiten fabrics.
Correct Answer
B. Bleach
Explanation
Bleach is the correct answer because it is a type of chemical that helps remove stains, kill bacteria, and whiten fabrics. It is commonly used in laundry and cleaning products for its disinfectant and whitening properties.
8.
List the type of chemical described in questions 6 through 10. Mild acid used to neutralize any residual alkalinity in fabrics after washing and rinsing.
Correct Answer
C. Sours
Explanation
The correct answer is "Sours" because sours are mild acids that are used to neutralize any residual alkalinity in fabrics after washing and rinsing.
9.
List the type of chemical described in questions 6 through 10. Prevent the growth of bacteria and fungus on linens for up to 30 days.
Correct Answer
D. Mildewcides
Explanation
The correct answer is "Mildewcides." Mildewcides are chemicals that are used to prevent the growth of bacteria and fungus on linens for a period of up to 30 days. They are specifically designed to inhibit the growth of mildew and other microorganisms, ensuring that linens remain clean and free from harmful pathogens.
10.
List the type of chemical described in questions 6 through 10. Used in rinsing to ensure that all the chlorine in the bleach has been removed.
Correct Answer
E. Antichlors
Explanation
Antichlors are the type of chemical described in questions 6 through 10. They are used in rinsing to ensure that all the chlorine in the bleach has been removed.