What are detergents chemicaly? List two merits and two demerits of using detergents for cleanising. State the reason for the suitability of detergents for washing, even in the case of water having calcium and a magnesium ions.

What type of detergent is used for dish washing in a dish washer ?

Name two major disadvantages of using synthetic detergents.

What roles do enzymes play in detergent that we use for washing clothes? Are these enzymes produced from some unique microorganisms?

If water contains calcium hydrogencarbonate, out of soap and synthetic detergents which one will you use for cleansing clothes ?

If water contains calcium hydrogen carbonate, out of soap and synthetic detergents which one will you use for cleansing clother ?

Use deductive reasoning to answer the following: Martians have red tongues. Gulag is a Martian. Based on these two statements, what can you conclude about Gulag?

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: The fungi are widespread in distribution and they even live on inside other plants and animals. Reason. Fungi are able to grow anywhere on land, water or other organisms because they have a variety of pigments including chlorophyll, carotenoids, fucoxanthin and phycoerythrin.

Two convex lenses of same focal length but of aperture D_1 and D_2(D2 lt D1) ,are used as the objective lenses in two astronomical telescopes having identical eyepieces. what is the ratio of their resolving powers? Which telescope will you prefer and why ? Give reason.

Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Write its chemical name and formula. How is it manufactured? Write the chemical equation for the reaction involved. Also list two other uses of the compound.