Which of the following is more effective in coagulating positively charged hydrated ferric oxide sol : (i) KCl, (ii) CaSO4, (iii) K3[Fe(CN)6] ?
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A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field.
(d) upward In accordance with Fleming's left-hand rule, the direction of magnetic field is vertically upward.
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Which of the following statements about Rutherford’s model of atom are correct? (i) considered the nucleus as positively charged
(a) (i) and (iii)
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Give reason for the following: (a) Nucleus of an atom is heavy and positively charged. (b) An atom is electrically neutral.
(a) Nucleus consists of proton and neutron. Proton has positive charge whereas neutron has no charge hence net charge on nucleus is positive. Nucleus is heavy because of the presence...
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Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
charged balloon is repelled by another charged balloon because both carry same charges and we know same charges repel each other whereas an uncharged balloon is attracted by charged balloon...
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What happens when hydrated ferric oxide and arsenious sulphide sols are mixed in almost equal proportions ?
[Hint : Mutual precipitation/coagulation took place.]
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A positively charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic
Since the positively charged particle (alpha-particle) projected towards west, so the direction of current is towards west. Now the deflection is towards north, so the force is towards north' Now...
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Explain what is observed when: (i) an electrolyte, KCl, is added to a hydrated ferric oxide sol.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by the oppositely charged Cl- ions provided by KCl. (ii) On passing direct current, colloidal particles move towards the oppositely charged...
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What happens in the following activities and why? (i) An electrolyte is added to a hydrated ferric oxide sol in water.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by the negatively charged ions provided by electrolyte. (ii) The path of light becomes visible due to scattering of light by...
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Describe a conspicuous change observed when (i) a solution of NaCl is added to a sol of hydrated ferric oxide.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by negatively charged Cl– ions provided by electrolyte sodium chloride. (ii) The path of light is not visible when light is...
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In which of the following forms is iron absorbed by plants ? (1) Ferric (2) Ferrous (3) Free element (4) Both ferric and ferrous
Iron absorbed by plants is Ferric
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