Which one of the following salts does not possess water of crystallization?
- A.Potassium permanganate
- B.Blue vitriol
- C.Washing soda
- D.Mohr's salt
Correct answer
Explanation
The correct answer is A, Potassium permanganate. Potassium permanganate, KMnO₄, forms dark purple crystals that contain no water of crystallization; its formula has no attached water molecules. Water of crystallization is the fixed number of water molecules that is built into the crystal of a salt and often gives it its shape and colour. Option B is wrong because blue vitriol is copper sulphate pentahydrate, CuSO₄·5H₂O; its five water molecules give it the blue colour, and on heating it turns into white anhydrous copper sulphate. Option C is wrong because washing soda is sodium carbonate decahydrate, Na₂CO₃·10H₂O, with ten molecules of water of crystallization. Option D is wrong because Mohr's salt is ferrous ammonium sulphate hexahydrate, FeSO₄·(NH₄)₂SO₄·6H₂O, a double salt with six water molecules, widely used in titrations. Exam tip: CuSO₄·5H₂O (blue vitriol), Na₂CO₃·10H₂O (washing soda), CaSO₄·2H₂O (gypsum); KMnO₄ is anhydrous.
Practice Questions
View allChlorophyll in photosynthetic prokaryotic bacteria is associated with
- A.plastids
- B.membranous vesicles
- C.nucleoids
- D.chromosomes
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Photosynthetic bacteria have no chloroplasts; their pigments sit on infoldings of the cell membrane that form vesicles or sacs, often called chromatophores.
Read the full explanation →Fat in human body is stored in
- A.Adipose tissue
- B.Red blood cells
- C.Muscle tissue
- D.Epithelial tissue
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Adipose tissue is a loose connective tissue whose cells, called adipocytes, are built to store fat. Each cell holds a large droplet of fat that pushes the nucleus and cytoplasm to one side.
Read the full explanation →Which one of the following is a metalloid ?
- A.Germanium
- B.Coke
- C.Iodine
- D.Sugar
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Germanium is a metalloid, an element whose properties lie between those of metals and non-metals. It is a hard, shiny, grey-white solid like a metal, yet it is brittle and conducts electricity far less well than a metal, which makes it a semiconductor.
Read the full explanation →A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?
- A.The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
- B.Both the photons have different energies.
- C.The speeds of both the photons in vacuum are different.
- D.The frequency of X-ray photon is higher than the frequency of visible radiation photon.
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This statement is wrong because every photon, whatever its energy, travels in vacuum at the same speed of light, about 3 × 10^8 metres per second.
Read the full explanation →Which of the following substances cause temporary hardness in water?
1. Mg(HCO3)2
2. Ca(HCO3)2
3. CaCl2
4. MgSO4
Select the correct answer using the code given below.
- A.3 and 4
- B.2 and 3
- C.1 and 4
- D.1 and 2
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Temporary hardness is caused by the bicarbonates of magnesium and calcium, Mg(HCO3)2 and Ca(HCO3)2. It is called temporary because simple boiling removes it: on heating, the soluble bicarbonates break down into insoluble carbonate or hydroxide, carbon dioxide and water, and the solid settles out.
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