Chemistry - Study Mode

[#686] If a buffer solution is diluted its pH
Correct Answer

(B) Remains same

Explanation

Solution: Generally, dilution has no effect on the pH.

[#687] 'Vinegar' is a commercial name of
Correct Answer

(C) Acetic acid

Explanation

Solution: Vinegar is a liquid substance consisting mainly of acetic acid (CH 3 CO 2 H) and water, the acetic acid being produced through the fermentation of ethanol by acetic acid bacteria. It is today mainly used in the kitchen as a general cooking ingredient.

[#688] The apparatus used to test acidity of aqueous solution is
Correct Answer

(A) PH meter

Explanation

Solution: A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading.

[#689] Which one of the following organic compound is used to remove stains of iron compounds?
Correct Answer

(A) Oxalic acid

Explanation

Solution: Oxalic acid is widely used as an acid rinse in laundries, where it is effective in removing rust and ink stains because it converts most insoluble iron compounds into a soluble complex ion.

[#690] Which one of the following is not a characteristic feature of alloys?
Correct Answer

(D) Homogeneous systems

Explanation

Solution: An alloy is a mixture or metallic solid solution composed of two or more elements. So they are heterogeneous systems. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal (heat treatment) history. Alloys usually have different properties from those of the component elements.