volumetric

Question 2

What is a standard solution?

Answer 2

A solution whose strength is known

Question 3

Name the standard solution in KMnO4 Vs Mohrs salt solution titration

Answer 3

Mohrs salt

Question 4

Name the standard solution in KMnO4 Vs oxalic acid titration

Answer 4

Oxalic acid

Question 5

What is a primary standard?

Answer 5

A chemical substance whose standard solution can be prepared by dissolving it in water

Question 6

Is NaOH a primary standard?

Answer 6

No

Question 7

Are molality and molarity the same?

Answer 7

No

Question 8

What is titration?

Answer 8

The process of adding one solution from the burette to another in the conical flask to complete the chemical reaction

Question 9

What is an indicator?

Answer 9

A chemical substance which changes colour at the end point

Question 10

What is the end point?

Answer 10

The stage during titration at which the reaction is just complete

Question 11

Why must burette and pipette be rinsed with the solution they are filled with?

Answer 11

To remove any substance sticking to their sides, which would decrease the volume of the liquids

Question 12

What is a molar solution?

Answer 12

A solution which contains one gm mole of the solute in 1 litre of solution

Question 13

What is permanganometry?

Answer 13

Redox titrations involving KMnO4 as the oxidizing agent

Question 14

What is a redox reaction?

Answer 14

A reaction in which both oxidation and reduction take place simultaneously

Question 15

Identify the oxidizing and reducing agents in the reaction between KMnO4 and Mohrs salt

Answer 15

Oxidizing agent - KMnO4, Reducing agent - Mohrs salt

Question 16

Identify the oxidizing and reducing agents in the reaction between KMnO4 and oxalic acid

Answer 16

Oxidizing agent - KMnO4, Reducing agent - Oxalic acid

Question 17

What happens to the oxidizing agent and reducing agent in a redox reaction?

Answer 17

Oxidizing agent undergoes reduction and reducing agent undergoes oxidation

Question 18

What is the indicator used in KMnO4 titrations?

Answer 18

No indicator is used because KMnO4 acts as a self indicator

Question 19

Why does KMnO4 act as a self indicator?

Answer 19

In the presence of dilute H2SO4, excess KMnO4 imparts a pink colour to the solution

Question 20

What is the end point in KMnO4 titrations?

Answer 20

From colourless to permanent light pink

Question 21

Why are a few drops of concentrated H2SO4 added while preparing a standard solution of Mohrs salt?

Answer 21

To prevent the hydrolysis of Mohrs salt

Question 22

Why should you not use a burette with a rubber pinch cock in KMnO4 titrations?

Answer 22

Because KMnO4 attacks rubber

Question 23

Why should oxalic acid solution be heated before titration with KMnO4?

Answer 23

To speed up the liberation of Mn2+ ions and enhance reaction rate

Question 24

Why is a brown ppt sometimes observed in KMnO4 titrations?

Answer 24

Due to insufficient quantity of dilute H2SO4 leading to incomplete oxidation

Question 25

What is the molecular formula of Mohrs salt?

Answer 25

FeSO4(NH4)2SO4.6H2O

Question 26

What are acidic and basic radicals?

Answer 26

Radicals carrying positive charge are basic radicals; those carrying negative charge are acidic radicals

Question 27

What type of bond is present in an inorganic salt?

Answer 27

Ionic bond

Question 28

Name the coloured basic radicals

Answer 28

* Cu2+ * Fe2+ * Fe3+ * Mn2+ * Cr3+ * Ni2+ * Co2+

Question 29

What is the colour of manganese salt?

Answer 29

Light pink or flesh colour

Question 30

What is the colour of iron salts?

Answer 30

* Ferrous salts - light green * Ferric salts - brown

Question 31

Name the radical which produces CO2 on heating

Answer 31

Carbonate

Question 32

What is the chemistry of the flame test?

Answer 32

Valence electron of the atom gets excited and jumps to a higher level, emitting radiation in the visible region upon returning to ground state

Question 33

What is Nessler's reagent?

Answer 33

A solution of mercuric iodide in potassium iodide

Question 34

Name the acid radicals detected by concentrated H2SO4

Answer 34

* Cl- * Br- * I- * NO3- * CH3COO-

Question 35

What is lime water?

Answer 35

A solution of Ca(OH)2 in water

Question 36

What will happen if CO2 is passed through lime water?

Answer 36

It turns lime water milky due to the formation of CaCO3

Question 37

What will happen if excess CO2 is passed through lime water?

Answer 37

The white ppt of CaCO3 changes into soluble calcium bicarbonate, and the milkiness disappears

Question 38

Is there any gas other than CO2 which turns lime water milky?

Answer 38

Yes, it is SO2

Question 39

What is the function of the paper pellet when heating nitrates with concentrated H2SO4?

Answer 39

It reduces HNO3 to NO2

Question 40

Name group reagents for different groups

Answer 40

* Group 1 – Dil HCl * Group 2 – H2S in presence of HCl * Group 3- NH4OH in presence of NH4Cl * Group 4- H2S in presence of NH4OH * Group 5- Ammonium carbonate in presence of NH4Cl and NH4OH * Group 6- No specific group reagent

Question 41

What is blue lake?

Answer 41

Blue litmus absorbed on white ppt of Al(OH)3 floating in colourless solution

Question 42

Name the chemicals used for preparing H2S gas

Answer 42

Ferrous sulphide and dilute H2SO4