Recent questions tagged surface-chemistry

Which of the following correctly denotes the catalyst and promoter used in Haber's process for manufacture of ammonia, respectively?

asked Feb 15, 2017 by meena.p

1 answer

Explain how the phenomenon of absorption finds application in each of the following process : (i) Production of vaccum (ii) Heterogeneous catalysis

asked Nov 25, 2016 by meena.p

1 answer

Dialysis is a method of purification of sols, But prolonged dialysis of the sol makes it unstable . Why ?

asked Nov 23, 2016 by meena.p

1 answer

On visit to your native village, you find that lot of smoke, dust and some other gases are coming out of the chimney of a recently set up factory near the village which is the cause of many respiratory problems for the people living there. Answer the following questions (i) As a chemistry student, what method you will suggest the factory owner to manage dust and smoke? (ii) What is the basic principle involved in your suggestion? (iii) What values are associated with your advice?

asked Nov 22, 2016 by meena.p

1 answer

$SnO_2$ forms a positively charged colloidal Sol in the basic medium why ?

asked Nov 22, 2016 by meena.p

1 answer

Write two difference between sols and emulsions.

asked Nov 17, 2016 by meena.p

1 answer

Explain : (i) The molecules $NH_3$ and $NF_3$ have dipole moments which are of opposite direction . (ii) Sulphur in vapour state exhibits paramagnetism

asked Nov 17, 2016 by meena.p

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What is observed when : (i) A beam of light is passed through a colloidal solution ? (ii) Electric current is passed through a colloidal solution ?

asked Nov 16, 2016 by meena.p

1 answer

Why is ferric chloride preferred over potassium chloride in case of a cut leading to bleeding?

asked Nov 14, 2016 by meena.p

1 answer

Depict the galvanic cell in which the reaction $2Zn(s) +2 Ag^{+}(aq) \to Zn ^{2+}(aq) +2 Ag(s) $ takes place . Further show: (i) Which of the electrode is negatively charged? (ii) The carriers of the current in the cell. (iii) Individual reaction at each electrode.

asked Nov 4, 2016 by meena.p

1 answer

Why is ferric chloride preffered over potassium in case of a cut leading to bleeding ?

asked Nov 4, 2016 by meena.p

1 answer

Explain what is observed when (a) an electric current is passed through a solution . (b) a beam of light is passed through a solution (c) an electrolyte (say NaCl) is added to ferric hydroxide solution .

asked Nov 3, 2016 by meena.p

1 answer

What is the main cause of charge on a colloidal solution ?

asked Oct 31, 2016 by meena.p

1 answer

Out of C and CO, which is a better reducing agent for ZnO ?

asked Oct 27, 2016 by meena.p

1 answer

Give one example each of oil in water and water in oil emulsion.

asked Oct 25, 2016 by meena.p

1 answer

Why does a galvanic cell become dead after some time ?

asked Oct 25, 2016 by meena.p

1 answer

Why does physiorption decrease with increase of temperature ?

asked Oct 20, 2016 by meena.p

1 answer

On dissolving $19.5\;g$ of $CH_2FOOH$ in $500\;g$ of water, a depression of $1^{\circ}C$ in freezing point of water is observed . Calculate the van't Hoff factor and dissociation constant of fluoro acetic acid Given $K_f= 1.86\;k kg mol^{-1}$

asked Oct 20, 2016 by meena.p

1 answer

What is the difference between physisorption and chemisorption?

asked Oct 17, 2016 by meena.p

1 answer

Absorption of gases on solid surface is generally exothermic because absorption

asked Oct 13, 2016 by meena.p

1 answer

Select the incorrect order

asked Jan 18, 2016 by meena.p

1 answer

Which of the following correctly denotes the catalyst and promoter used in Haber's process for manufacture of ammonia, respectively?

asked Apr 4, 2014 by mosymeow_1

1 answer

Which of the following properties are of lyophilic colloids?

asked Apr 4, 2014 by mosymeow_1

1 answer

Micelles are what type of colloids?

asked Apr 4, 2014 by mosymeow_1

1 answer

Which type of colloids mentioned below has both lyophilic and lyophobic groups of molecules?

asked Apr 4, 2014 by mosymeow_1

2 answers

Which of the following are not the properties of colloidal solution?

asked Apr 4, 2014 by mosymeow_1

1 answer

Which one of the following is not a surfactant ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following phrases correctly explains syneresis ?

asked Mar 20, 2014 by yamini.v

1 answer

At which point of lyophilic colloids , they are expected to have minimum stability ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following statements states the terms ' activity ' and ' selectivity ' respectively ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following is the general formula of zeolites ?

asked Mar 20, 2014 by yamini.v

1 answer

Among the following colloidal solo . Which one is given to a person having poisoning ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following is another name for gold number ?

asked Mar 20, 2014 by yamini.v

1 answer