The solubility in mol dm-3 of 20g of CuSO4 dissolved in 100g of water at 180o is[Cu = 64, S = 32, O =16]
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1990
In a reaction: SnO + 2C → Sn + 2CO, the mass of coke containing 80% carbon required to reduce 0.302 kg of pure tin oxide is?(Sn - 119, O - 16, C - 12).
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1990
Which of the following is a physical change?
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1990
Which of the following samples will react fastest with dilute trioxonitrate (V) acid?
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1990
Iron galvanized with zinc is cathodically protected from corrosion. This is because?
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1990
Fe2O3(s) + 2Al(s) → Al2O3 + 2Fe(s) If the heats of formation of Al2O3 and Fe2O3 are - 1670 kj mol-1 and - 822 kj mol-1 respectively, the enthalpy change in kj for the reaction is ?
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1990
In the reaction 1O-3 + 5l- + 6H+ → 312 + 3H2O, the oxidizing agent is?
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1990
Cr2O7 + 6Fe2+ + 14H+ → 2Cr3+ +6Fe3+ + 7H2O. In the above , the oxidation number of chromium changed from?
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1990
In the Haber process for the manufacture of ammonia, the catalyst commonly used is finely divided ?
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1990
Which of the following tests will completely identify anyone of surphur (VI) oxide, hydrogen, carbon (IV) oxide and nitrogen (II) oxide?
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1990
The brown fumes given off when trioxonitrate (V) acid is heated consist of ?
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1990
Which of the following gases can be collected by the upward displacement of air?
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1990
In the reaction:2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;The concentration of iodine in the equilibrium mixture can be increased by?
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1990
Sodium hydrogen should be stored in properly closed containers because it?
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1990
The major component of the slag from the production of iron is?
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1990
Coal fire should not be used in poorly ventilated rooms because ?
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1990
Which of the following metals will liberate hydrogen from steam or dilute acid?
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1990
A metallic oxide which reacts with both HCl and NaOH to give salt and water only can be classified as?
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1990
Alkaonic acids have low volatility compared with alkanols because they?
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1990
The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?