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Recent questions tagged practical-chemistry

A pale green crystalline metal salt $M$ dissolves freely in water. It gives a brown precipitate on addition of aqueous $NaOH$. The metal salt solution also gives a black precipitate on bubbling $H_2S$ in aqueous medium. An aqueous solution of the metal salt decolourises the pink colour of the permanganate solution. The metal in the metal salt solution is

asked Jan 28, 2014 by mosymeow_1

1 answer

Which of the following salt would give $SO_2$ with hot and dil. $H_2SO_4$ and also decolourise $Br_2$ water?

asked Jan 28, 2014 by mosymeow_1

1 answer

An aqueous solution of coloureless metal sulphate M gives a white precipitate with $NH_4OH$. This was soluble in excess of $NH_4OH$. On passing $H_2S$ through this solution a white ppt is formed. The metal M in the salt is

asked Jan 28, 2014 by mosymeow_1

1 answer

A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute $H_2SO_4$ but gives no precipitate with sodium chloride or iodide, it is

asked Jan 28, 2014 by mosymeow_1

1 answer

$K_4[Fe(CN)_6]$ can be used to detect one or more out of $Fe^{2+}, Fe^{3+}, Zn^{2+}, Cu^{2+}, Cd^{2+}$

asked Jan 28, 2014 by mosymeow_1

1 answer

$NH_4CNS$ can be used to test one or more out of $Fe^{3+}, Co^{2+}, Cu^{2+}$

asked Jan 28, 2014 by mosymeow_1

1 answer

Potassium ferrocyanide is used in the detection of

asked Jan 28, 2014 by mosymeow_1

1 answer

In the fourth group, $Mn(OH)_2$ on heating with $PbO_2$ and conc. $HNO_3$ gives pink colour due to the formation of

asked Jan 28, 2014 by mosymeow_1

1 answer

To aviod the precipitation of hydroxide of $Ni^{2+}, Co^{2+}, Mn^{2+}$ along with those of the third group cations, the solutions should be

asked Jan 28, 2014 by mosymeow_1

1 answer

Mark the compound which turns black with $NH_4OH$

asked Jan 28, 2014 by mosymeow_1

1 answer

Chromyl chloride vapours are dissolved in water and acetic acid and lead acetate solution is added, then

asked Jan 28, 2014 by mosymeow_1

1 answer

In a combination of $NO_3^-, Br^-$ and $I^-$ present in a mixture, $Br^-$ and $I^-$ interfere in the ring test for $NO_3^-$. These are removed by adding a solution of

asked Jan 28, 2014 by mosymeow_1

1 answer

$BaCl_2$ solution gives a white ppt. with a solution of a salt, which dissolves in dil. HCl with the evolution of a colourless, pungent smelling gas. The acid radical in the salt is

asked Jan 28, 2014 by mosymeow_1

1 answer

To a solution of a salt, $MgSO_4$ solution is added and white ppt. appears only on heating. The acid radical in the salt is

asked Jan 28, 2014 by mosymeow_1

1 answer

On heating a mixture of potassium dichromate and sodium chloride with concentrated sulphuric acid in a dry test tube, the compound formed

asked Jan 28, 2014 by mosymeow_1

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Nitrate is confirmed by ring test. The brown colour of the ring test is due to the formation of

asked Jan 28, 2014 by mosymeow_1

1 answer

Production of a green edged flame on igniting the vapours evolved by heating a given inorganic salt with few mL of ethyl alcohol and conc. $H_2SO_4$ indicates the presence of a

asked Jan 26, 2014 by mosymeow_1

1 answer

NaCl , NaBr and NaI mixture on heating with conc. $H_2SO_4$ gives gases respectively

asked Jan 26, 2014 by mosymeow_1

1 answer

A salt on reaction with dil. $H_2SO_4$ gives a reddish brown gas. The salt is

asked Jan 26, 2014 by mosymeow_1

1 answer

A few drops of conc $H_2SO_4$ is added to the solution of $FeSO_4$ in water to

asked Jan 26, 2014 by mosymeow_1

1 answer

Which of the following test can be used to distinguish between phenol and cyclohexanol?

asked Jan 26, 2014 by mosymeow_1

1 answer

In Lassaigne's test when both N and S are present, blood red colour is due to the formation of

asked Jan 26, 2014 by mosymeow_1

1 answer

On heating ammonium dichromate the gas evolved is

asked Jan 26, 2014 by mosymeow_1

1 answer

Which one among the following pairs of ions cannot be separated by $H_2S$ in dilute hydrochloric acid?

asked Jan 26, 2014 by mosymeow_1

1 answer

The phenomenon in which white transparent crystal changes into white powder is called

asked Jan 26, 2014 by mosymeow_1

1 answer

Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of conc. HCl?

asked Jan 26, 2014 by mosymeow_1

1 answer

A one litre flask is full of brown bromine fumes. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some

asked Jan 26, 2014 by mosymeow_1

1 answer

A mixture of two salts is not water soluble but dissolves completely in dil. HCl to form a colourless solution. The mixture could be

asked Jan 26, 2014 by mosymeow_1

1 answer

Which of the following is soluble in yellow ammonium sulphide?

asked Jan 26, 2014 by mosymeow_1

1 answer

An aqueous solution $FeSO_4.Al_2(SO_4)_3$ and chrome alum is heated with excess of $Na_2O_2$ and filtered. The materials obtained are

asked Jan 26, 2014 by mosymeow_1

1 answer

Brown ring test is used to detect

asked Jan 26, 2014 by mosymeow_1

1 answer

Turn bull's blue is the compound

asked Jan 26, 2014 by mosymeow_1

1 answer

A white crystalline substance dissolves in water. On passing $H_2S$ in this solution, a black ppt. is obtained. The black ppt. dissolves completely in hot $HNO_3$. On adding a few drops of conc. $H_2SO_4$, a white ppt. is obtained. The ppt. is that of

asked Jan 26, 2014 by mosymeow_1

1 answer

Yellow ammonium sulphide solution is a suitable reagent for the separation of

asked Jan 26, 2014 by mosymeow_1

1 answer

Which of the following sol will be destabilised with ionic impurities- if present?

asked Jan 26, 2014 by mosymeow_1

1 answer

Which of the following sols cannot be prepared by boiling the dispersed phase with dispersion medium (water)?

asked Jan 26, 2014 by mosymeow_1

1 answer

For dissolution of an ionic solid water $\Delta_{sol}H^{\Theta}$ =

asked Jan 26, 2014 by mosymeow_1

1 answer

$H_2S$ will precipitate the sulphide of all the metals from the solution of chlorides of Cu, Zn and Cd if

asked Jan 25, 2014 by mosymeow_1

1 answer

Sometimes yellow turbidity appears while passing $H_2S$ gas even in the absence of II group radicals. This is because

asked Jan 25, 2014 by mosymeow_1

1 answer

A salt solution is treated with chloroform drops. Then it is shaken with chlorine water. Chloroform layer becomes violet, solution obtains

asked Jan 25, 2014 by mosymeow_1

1 answer

The salt used for performing bead test in qualitative inorganic analysis is

asked Jan 25, 2014 by mosymeow_1

1 answer

In $KMnO_4$ titrations the indicator used is

asked Jan 25, 2014 by mosymeow_1

1 answer

The colour of the dye obtained by coupling benzene diazonium chloride with aniline is

asked Jan 24, 2014 by mosymeow_1

1 answer

Coupling of benzene diazonium chloride and aniline is carried out at pH

asked Jan 24, 2014 by mosymeow_1

1 answer

Potash Alum is

asked Jan 24, 2014 by mosymeow_1

2 answers

Phenol and acetic acid can be differentiated by

asked Jan 24, 2014 by mosymeow_1

1 answer

Ethanol & Methanol can be differentiated by

asked Jan 24, 2014 by mosymeow_1

1 answer

Alliphatic & aromatic aldehydes can be differentiated by

asked Jan 24, 2014 by mosymeow_1

1 answer

Which of the following test is given both by aldehydes and ketones?

asked Jan 24, 2014 by mosymeow_1

1 answer

Methyl Salicylate has a smell of

asked Jan 24, 2014 by mosymeow_1

1 answer

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