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Recent questions tagged laws-of-chemical-combinations

Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates

asked Mar 31, 2014 by meena.p

1 answer

The mass of a piece of paper is $0.02\;g$ and the mass of a solid substance along with the same piece of paper is $20.036\;g$. If the volume of the solid is $2.16\;cm^3$ its density to the proper number of significant digits will be

asked Mar 31, 2014 by meena.p

1 answer

Among $FeSO_4.7H_2O(A),CuSO_4.5H_2O (B), ZnSO_4.7H_20(c),MnSO_4.4H_2O $(D), isomorphous salts are

asked Mar 28, 2014 by meena.p

1 answer

A balanced chemical equation is in accordance with

asked Mar 28, 2014 by meena.p

1 answer

The specific heat of a metal is 0.16, its approximate atomic weight would be

asked Mar 26, 2014 by sreemathi.v

1 answer

$2H_2+O_2\rightarrow 2H_2O$.2g $H_2$ and 1g $O_2$ react to form $H_2O$

asked Mar 21, 2014 by sreemathi.v

1 answer

The reaction , $3Cl_O(aq) \longrightarrow ClO_{3(ag)}^{-}+2 Cl^{-}_ {(aq)}$ is an example of

asked Mar 21, 2014 by meena.p

1 answer

A gaseous mixture contains oxygen and nitrogen in the ratio of $1:4$ by weight . Therefore , the ratio of their number of molecules is

asked Mar 21, 2014 by meena.p

1 answer

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide evolved is

asked Mar 21, 2014 by meena.p

1 answer

An ore contains 2.0% by weight of the mineral argentive $(Ag_2S)$.How much of ore should be taken to produce 1.0g pure Ag?

asked Jan 9, 2014 by sreemathi.v

1 answer

Amount of oxygen required for complete combustion of 27g Al is

asked Jan 8, 2014 by sreemathi.v

1 answer

Assuming fully decomposed,the volume of $CO_2$ released at STP,on heating 9.85g of $BaCO_3$ (at wt of Ba=137)will be:

asked Jan 8, 2014 by sreemathi.v

1 answer

The mass of carbon anode consumed(giving only carbon dioxide) in the production of 270Kg of aluminum metal from bauxite by the Hall's process is

asked Jan 8, 2014 by sreemathi.v

1 answer

Which of following is a secondary standard

asked Jan 8, 2014 by sreemathi.v

1 answer

A mixture of Al and Zn weighing 1.67g was completely dissolved in acid and evolved 1.69litre of $H_2$ at NTP.What was the weight of Al in original mixture?

asked Jan 8, 2014 by sreemathi.v

1 answer

A drop (0.05ml) of 12M HCl is spread over a thin sheet of aluminum foil (thickness 0.10mm and density of Al=2.70g/ml).Assuming whole of the HCl is used to dissolve Al,what will be the maximum area of hole produced in foil?

asked Jan 7, 2014 by sreemathi.v

1 answer

A solid mixture 5g consists of lead nitrate and sodium nitrate was heated below $600^{\large\circ}C$ until weight of residue was conotaut.If the loss in weight is 28%,find the amount of lead nitrate and sodium nitrate mixture.

asked Nov 6, 2013 by sreemathi.v

1 answer

A gas mixture of $3l$ of propane $(C_3H_8)$ and butane $C_4H_{10}$ on complete combustion at $25C^{\large\circ}$ produced $10l$ $CO_2$.Find out the composition of gas mixture.

asked Nov 6, 2013 by sreemathi.v

1 answer

For the reaction ,$N_2O_5(g)\iff 2NO_2(g)+0.5O_2(g)$.Calculate the mole fraction of $N_2O_5(g)$ decomposed at a constant volume and temperature,if the initial pressure at any time is 960mm Hg.Assume ideal gas behaviour.

asked Nov 6, 2013 by sreemathi.v

1 answer

$5ml$ of a gaseous hydrocarbon was exposed to $30ml$ of $O_2$.The resultant gas,on cooling is found to measure $25\;ml$ of which $10\;ml$ are obsorbed by NaOH and the remainder by pyrogallol.Determine molecular formula of hydrocarbons .All measurement are made at constant pressure and temperature.

asked Oct 30, 2013 by sreemathi.v

1 answer

The solubility of $K_2SO_4$ in water is 16g at $50^{\large \circ}C$.The minimum amount of water required to dissolve $4g\;K_2SO_4$ is

asked Oct 25, 2013 by sreemathi.v

1 answer

Weight of oxygen in $Fe_2O_3$ and FeO in the simple ratio for the same amount of Fe is

asked Oct 24, 2013 by sreemathi.v

1 answer

3g of hydrocarbon on combustion with 11.2g of oxygen produce 8.8g of $CO_2$ and 5.4g of $H_2O$.The data illustrates the law of

asked Oct 22, 2013 by sreemathi.v

1 answer

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