Metals and Non-Metals — Science STD 10 — Question

A student takes four test tubes marked P, Q, R and S of 25 mL capacity and fill 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as – KCl in P, NaCl in Q, CaCl₂ in R and MgCl₂ in S. He then adds about 2 mL of a sample of soap solution to each of the above test tubes. On shaking the contents of each of the test tubes, he is likely to observe a good amount of lather (foam) in the test tubes marked:

A solution turns the colour of turmeric to reddish brown. If the same solution is poured on universal indictor, its colour would change to-

Which of the given statement is true or false:
Statement A: Valeric acid is the common name of hexane.
Statement B: Glycerol is added in the manufacturing of soap.

Which one of the following are the correct observations about acetic acid?

The firSt member of the alkyne homologous series is:

Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?

Identify the correct representation of reaction occurring during chloralkali process:

A student adds 2mL of acetic acid to a test tube containing 2mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:

What type of chemical reaction does the reaction belong to?
A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.