কাজ
প্রুরিটাস, চামড়া জ্বালা, ঝরঝর করে কাঁদছে, ব্যথা এবং চুলকানি চিকিৎসায় নির্দেশিত হয়।
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Calculate the mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molar aqueous solution.
Answer: Given that 0.375 Molar aqueous solution Molar represent molarity of the solution Hence given molarity of solution will 0.375M Formula of molarity Molarity (M) = No. of moles of solute / volume of solution in...
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Food cans are coated with tin and not with zinc because (a) zinc is costlier than tin.
(c) Food cans are coated with tin and not with zinc because zinc is more reactive than tin.
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Which of the following can be beaten into thin sheets? a. Zinc b. Phosphorus c. Sulphur d. Oxygen
Zinc can be beaten into thin sheets.
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Out of zinc and tin, which one protects iron better even after cracks and why ?
Zinc protects better because oxidation of zinc is greater but that of tin is less than that of iron.
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Can you store copper sulphate solutions in a zinc pot?
Zinc is more reactive than copper. Therefore, zinc can displace copper from its salt solution. If copper sulphate solution is stored in a zinc pot, then zinc will displace copper...
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A sample of galena is contaminated with zinc blende.Name one
The correct answer " NaCN '
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Zinc is used but not copper for the recovery for metallic silver from the complex [Ag(CN)2]-,
[Hint : Zinc reacts at faster rate as compared with copper, further zinc is cheaper than copper.]
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Give equations for the industrial extraction of zinc from calamine.
ZnCO3 => ZnO + CO2 (Calcination) ZnO + C => Zn + CO (Reduction)
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In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomization of zinc is the lowest, i.e., 126 kJ mol−1. Why?
The extent of metallic bonding an element undergoes decides the enthalpy of atomization. nThe more extensive the metallic bonding of an element, the more will be its enthalpy of atomization....
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Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid,whereas copper does not. Explain why?
Zinc is above hydrogen rvhereas copper is below hydrogen in the activity series of metals. That is why zinc displaces hydrogen from dilute hydrochloric acid, while copper does not. ...
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