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Answers posted by thanvigandhi_1

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answered Aug 1, 2014
Answer : Nessler's reagent which is an aqueous solution of $K_2[Hgl_4]$ is used to test ammonium sa...
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answered Aug 1, 2014
Answer : Zinc chloride is a toxic compound is not correctBecause Zinc chloride is a non-toxic compo...
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answered Aug 1, 2014
Answer : The difference in colour of the two varieties of HgO is due to the particle size - the pa...
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answered Aug 1, 2014
Answer : Zno is a non-toxic compound and is blackened by atmospheric hydrogen sulphideZno is a non-...
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answered Aug 1, 2014
Answer : $3Zn+8HNO_3 \rightarrow 3Zn(NO_3)_2+2N_2O+4H_2O $$ \qquad \: \qquad \: \qquad ( \text{di...
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answered Aug 1, 2014
Answer : Both $Zn$ and $Hg$ react with dilute $HNO_3$ liberating $NO$ gas$4Zn+10HNO_3 \rightarrow 4...
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answered Aug 1, 2014
Answer : Pure zinc reacts with water producing $ZnO$ and $H_2$Pure zinc does not react with water. ...
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answered Aug 1, 2014
Answer : CinnabarSphalerite is $\text{ZnS}$. Calamine is $\text{ZnCO}_3$. Cassiterite $\text{SnO}_2...
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answered Jul 31, 2014
minerals for zinc include smithsonite (zinc carbonate), hemimorphite (zinc silicate), wurtzite (anot...
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answered Jul 31, 2014
Answer : $Ag_2CrO_4$The colour of $Ag_2CrO_4$ is brick red
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answered Jul 31, 2014
Answer : $CuSO_4.2H_2O$$\quad \qquad \qquad (\text{exposure} ) \qquad \quad (373k) \quad \qquad \...
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answered Jul 31, 2014
Answer : Copper (II) oxide is red powder - Is not trueBecause Copper (II) oxide is black powder
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answered Jul 31, 2014
Answer : German silverGerman silver contains $\text{Cu}$, $\text{Zn}$ and $\text{Ni}$Gun metal conta...
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answered Jul 31, 2014
Answer : German silverThe composition of German silver is $\text{Cu}$ (25 - 50 %), $\text{Zn}$ (25 -...
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answered Jul 31, 2014
Answer : Phosphor bronzeThe composition of phosphor bronze is $\text{Cu}$ (95%), $\text{Sn}$ (4.8%) ...
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answered Jul 31, 2014
Answer : Silver can displace copper and gold from their respective salt solutionsSilver can displac...
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answered Jul 31, 2014
Answer : both copper and silver only$Cu+O_3 \rightarrow CuO+O_2$$2Ag+O_3 \rightarrow Ag_2O+O_2$$Ag...
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answered Jul 31, 2014
Answer : all the three coinage metals
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answered Jul 31, 2014
Answer : copper only$2Cu+2H_2SO_4+O_2 \rightarrow 2CuSO_4+2H_2O$$ \qquad \quad (\text{dilute})$$2Cu+...
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answered Jul 31, 2014
Answer : both copper and silver and not gold$Cu+2H_2SO_4 \rightarrow CuSO_4+SO_2+2H_2O$$2Ag+2H_2SO_...
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answered Jul 31, 2014
Answer : $NO_2$$ Cu+ 4HNO_3 \rightarrow Cu(NO_3)_2+2NO_2+2H_2O$$ \qquad (\text{Cone})$
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answered Jul 31, 2014
Answer : $NO$$3Cu+8HNO_3 \rightarrow 3Cu(NO_3)_2+2NO+4H_2O$$ \qquad \quad (\text{dilute})$
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answered Jul 31, 2014
Answer : The anode mud in the electrolytic refining of silver includes copper and goldAnode mud co...
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answered Jul 31, 2014
Chalcocite is $Cu_2S$.Argentite is cubic silver sulfide $(Ag_2S)$Pyrargyrite is a sulfosalt mineral ...
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answered Jul 31, 2014
Common Solder is an alloy of Tin and LeadAnswer : Common solder
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answered Jul 31, 2014
Answer : Impure metal is made anodeImpure metal is made cathode whereas pure metal is made anode.
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answered Jul 31, 2014
Answer : $FeSO_4.7H_2O$ acts as a primary standard in the volumetric analysis$FeSO_4.7H_2O$ does no...
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answered Jul 31, 2014
Answer : The aqueous solution of ferric salt is alkalineThe aqueous solution of ferric salt is acid...
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answered Jul 31, 2014
Answer : Nickel steelThe composition of Nickel steel is $Fe ( 96 - 98 \%)$ and $Ni(2-4\%)$
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answered Jul 31, 2014
Answer : MagnesiteMagnesite is $MgCO_3$Haematite - $Fe_2O_3$Magnetite $Fe_2O_4$Limonite - $Fe_2O_3. ...
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answered Jul 28, 2014
Answer : Aluminium dissolves in hydrochloric acid but not in concentrated sodium hydroxideAluminium ...
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answered Jul 27, 2014
Answer : 8 The formula of borax is $Na_2 [B_4O_5(OH)_4].8H_2O$  
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answered Jul 27, 2014
Answer : 4The structure of Borax ishttp://clay6.com/mpaimg/2_boron58.jpg
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answered Jul 27, 2014
Answer : $HBO_2,H_2B_4O_7,B_2O$Option (D) is the correct answer.The reactions are $H_3BO_4 \large\fr...
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answered Jul 27, 2014
The structure of Borax ishttp://clay6.com/mpaimg/1_boron58.jpg $Na_2[B_4O_5(OH)_4].8H_2O $Hence opti...
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answered Jul 27, 2014
The structure of Borax ishttp://clay6.com/mpaimg/boron58.jpg Borax involves two boron atoms in $ sp^...
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answered Jul 27, 2014
Answer : $BF_3$ is a volatile liquidHence option (C) is the correct answer.$BF_3$ is a gaseous subst...
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answered Jul 27, 2014
Answer : Boran exhibits inert pair effect Option (B) is the correct answer. Inert pair ...
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answered Jul 27, 2014
Answer : borazine$B_2H_6 \large\frac{excess\: NH_5}{high\: temp}$$(BN)_x$Hence option (C) is the cor...
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answered Jul 27, 2014
The chrome alum involves 24 water of crystallization.$K_2SO_4.Cr_2(SO_4)_3.24H_2O $Hence option (D) ...
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answered Jul 26, 2014
The reaction is $ Al_2 (SO_4)_3 \rightarrow Al_2O_3+3SO_3$Hence option (C) is the correct answer. $A...
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answered Jul 26, 2014
Answer : ConstantanConstantan is an alloy of Cu ( 60 % ) and Ni (40 %).
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answered Jul 25, 2014
The structure of $Al_2Cl_6$ ishttp://clay6.com/mpaimg/46boron.jpg The bond lengths of terminal $Al -...
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answered Jul 25, 2014
Bauxite is $ Al_2O_3.2H_2O$Hence option (A) is the correct answer.
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answered Jul 25, 2014
Answer : OlivineOlivine is $ (Mg , Fe)^2 SiO_4$
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answered Jul 25, 2014
Metaboric acid is formed by heating of boric acid. $H_3BO_3 \large\frac{375k}{-H_2O}$$ HBO_2$Hence o...
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answered Jul 25, 2014
Boric acid is $H_3BO_3$. It is a monobasic acid. It does not liberate hydrogen ion but accepts a hyd...
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answered Jul 25, 2014
The structure of $B_2H_6$ isThe two $BH_2$ groups lie in the same plane while the two bridging hydro...
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answered Jul 25, 2014
Boron has a very low electrical conductivity.Ans : (B)
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answered Jul 25, 2014
Answer : $B_4H_{10}$ The treatment of borides with acids produces boranes.   &n...
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