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26. Atomic weight of an element is 30, its equivalent wt. is 10. The valency of element will be (Uttar Pradesh, Stage-I, 2014-15)

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27. 10 g H2 and 64 g 02 were taken in a sealed vessel and exploded. The amount of water produced in the b reaction was (NTSE West Bengal, Stage-I, 2014-15)

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28. How much MgO is obtained on heating 5 g of (MgC03) magnesium carbonate? (NTSE Uttar Pradesh, Stage-I, 2014-15)

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29. 8.7 g of pure Mn02 is heated with an excess of HCI and the gas evolved is passed into a solution of KI.
Calculate the weight of the iodine liberated (Mn = 55, CI = 35.5, I = 127) (NTSE Jharkhand, Stage-I, 2014-15)

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30. The number of iodine atoms present in 50 ml of a 0.1 M KI solution is (NTSE Jharkhand, Stage-I, 2014-15)

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