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MCQs
1) Potassium permanganate occurs in the form of ______.
(a) dark purple coloured crystals
(b) white coloured crystals
(c) blue coloured crystals
(d) colourless powder
2) Hydrogen peroxide is ______.
(a) Colourless liquid
(b) Yellow coloured gas
(c) White crystalline powder
(d) White amorphous powder
3) pKa of boric acid is ______.
(a) 3.3
(b) 7.5
(c) 9.19
(d) 10.5
4) Boric acid behaves as a strong acid when it is dissolved in ______.
(a) Water
(b) Glycerine
(c) Alcohol
(d) Olive oil
5) Kaolin is ______.
(a) Hydrated aluminium silicate
(b) Magnesium trisilicate hydrate
(c) Hydrated magnesium silicate
(d) Hydrated magnesium carbonate
Find your answers in the description below:
Properties of Important Inorganic Pharmaceuticals
1. Kaolin: It is hydrated aluminium silicate. It is a soft white or yellowish white powder, odourless with clay like taste. It is insoluble in water, in mineral acids and in solutions of alkali hydroxides. Chemically, it is inert.
2. Silver nitrate: (i) It is colourless, odourless crystalline powder with bitter and metallic taste. (ii) It is soluble in water and alcohol. (iii) It is incompatible with halides like Cl−, Br−, I−, and organic compounds, tannins etc.
3. Chlorhexidine gluconate: It is a cationic biguanide compound with antimicrobial properties.
4. Hydrogen peroxide: Physical properties: (i) It is colourless, odourless, transparent liquid. (ii) It has slight astringent and acidic taste. (iii) It is miscible with water, alcohol and ether having a weakly acidic reaction. Chemical properties: (i) It is an oxidizing agent. (ii) It oxidizes potassium iodide to iodine and potassium bromide to bromine in acidic medium. (iiii) Its dilute solution has bleaching action.
5. Borax: It effloresces in dry air. It has sweetish alkaline taste.
6. Boric acid: (i) Boric acid forms glyceroboric acid complex with glycerin which acts as a strong monobasic acid. This is why glycerin is used in the assay of boric acid. (ii) Its pKa is around 9.19. (iii) It is a white, crystalline powder or colourless shiny plates unctuous to the touch or white crystals; odourless with slightly acidic and bitter taste. (iv) It is sparingly soluble in water.
7. Chlorinated lime (Bleaching powder): (I) It is a dull white powder. It has characteristic strong odour of chlorine. (ii) On exposure to air it absorbs moisture and decomposes by liberating chlorine. (iii) It is sparingly soluble in water and insoluble in alcohol.
8. Potassium permanganate: It occurs as dark purple coloured monoclinic prisms, almost opaque with a blue metallic luster. It is odourless. An aqueous solution has sweetish astringent taste. It is a powerful oxidizing agent.
9. Sodium fluoride: It is a white crystalline powder. It is odourless and soluble in water and insoluble in alcohol.
10. Carbon dioxide: (i) It is a colourless, odourless gas with faintly acidic taste, (ii) It is soluble in water, (iii) It does not support combustion (iv) CO2 when passed in water forms carbonic acid. 25.
Check your Answers:
1) a)
2) d)
3) c)
4) c)
5) c)
Blog content and MCQs have been taken from the following:
1) Essential Pharmacy Review for Drugs Inspector Exams by Nirali Prakashan, Pune
To know more about the book:
Click here
2) Pharmacist Recruitment Exam by Nirali Prakashan, Pune
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