Q. Give some examples of secondary standard substance?

Ans.      Sodium hydroxide, Hydrochloric acid etc.

Q. Give some examples of primary standard substance?

Ans. Oxalic acid, Mohr’s salt, anhydrous sodium carbonate etc.

Q. What is secondary standard substance?

Ans. A substance available in low degree of purity, unstable & affected by air (gains & loses moisture in air).

Q. What is primary standard substance?

Ans. A substance available in high degree of purity, stable & unaffected by air (does not gain & lose moisture in air).

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Q. Why a titration flask should not be rinsed?

Ans.     During rinsing some solution will remain sticking to the titrating flask, so pipetted volume will increase.

Q. What is end point?

Ans.     The stage during titration at which the reaction is just complete is known as end point.

Q. What is indicator?

Ans.       Indicator is a chemical substance which changes colour at the end point.

Q. What is titration?

Ans.     The process to adding one solution from the burette to another in the conical flask in order to complete the chemical reaction, is known as titration.

Q. What is the principal of volumetric analysis?

Ans.     It is a mode of determination of the quantity of the substance present in a given solution to trace quantitatively with a solution of another substance of known concentration

Q. What is the use of a rider?

Ans.       A rider used for weighing less than 10 mg.

Q. Why the weights should not be lifted with hand?

Ans.       This causes error in the weighing.

Q. What do you mean by calibration?

Ans.     Calibration means to check or verify the value or measurement of an apparatus.

Q. What is molarity?

Ans. The number of moles of the solute present per litre of the solution is called molarity. Or The molar concentration of a solution, the number of moles of solute per liter of solution

What is molality?

The number of moles of the solute present in 1000 grams of solvent is called molality.

Q. What is primary standard?

Ans.   A chemical substance whose standard solution can be prepared by dissolving it in water is called a primary standard.

Q. What is normal solution?

Ans.   A solution containing gram equivalent mass of solute per litre is called a normal solution.

 

Q. What is molar solution?

Ans.       One litre of water contains gram mole of the substance.

Q. What is standard solution?

Ans.       A solution whose strength is known, is called standard solution.

Multiple Choice Question

Q. 01.  A solution whose strength is known is called

              a) Standard solution                                        b) Normal Solution

              c) Molar Solution                                            d) None of them

Q. 02.    One litre of water contains gram mole of the substance is called

              a) True solution                                               b) Molar Solution

              c) Colloidal Solution                                        d) None of them

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TPT-2011 Annual Meeting

It is great pleasure that Think Positive Trust Completed it's one year after initialisation. The meeting will be HELD in MANTHAN at BIYANI GIRLS COLLEGE, R-4, Sec-3, Vidhyadhar Nagar, Jaipur. One positive energy create a lot good changes where negativity spoil the LIFE 

Laboratories

There is many kinds of Laboratories in the field of Education, Industries, Research and Forensic (Intelligence) etc.

Most populer and research oriented field in the Labs. is Chemistry.