Lecturer Chemistry(BS-17) | Education Department | PPSC Past Interview

Question: Introduce yourself?

Answer: introduce myself in English and I am belong to chiniot district.

Question: You are from Chiniot and what  is speciality of chiniot?.

Answer: Chiniot is famous for its wooden furniture and developed as a centre of woodworking given its close proximity to the Chenab river.

Question: Difference between parliamentary govt and presidential govt?

Answer: The parliamentary system of government is one in which there exists a harmonious relationship between the legislative and exec body, while  judiciary body works independently. As against this, in presidential form government three organs of the government work independently of each other.

Question: Three Cities of Baluchistan without Quetta?

Answer: Zohb, Sibi, Khuzdar and Gawadar.

Question: Three cities of sindh without Karachi and Hyderabad?

Answer: Jacobabad, sukkur, Ghotki.

Question: Rivers in Punjab?

Answer: Satluj, chinab, Ravi, Sindh, Jehlum.

Question: Temperature range of oven used in gas chrimetgraity?

Answer: The temperature range 30-40C/min.

Question: What is the PNMR?

Answer: proton nuclear magnetic resonance is the application of nuclear magnetic resonance in NMR spectroscopy  with respect to hydrogen-1 nuclei within the molecules of a substance, in order to determine the structure of its molecules.

Question: What is  role of magnetic field in PNMR?

Answer: This role to probe the intrinsic spin properties of atomic nuclei.

Question: How alkane can be converted to alcohol?

Answer: The negatively-charged strong acid picks up the green electrophilic hydrogen. Now that the reaction is complete, the none-nucleophilic strong acid is regenerated as a satalyst and an alcohol forms on the most substituted carbon of the current alkane. At lower temperatures, more alchol product can be formed.

Question: IR principle?

Answer: The IR spectroscopy theory utilizes the concept that molecules tend to abosrob specific frequencies of light that are characteristic of the corresponding structure of the molecules. The energies are reliant on the shape of the molecular surfaces, the associated vibronic coupling, and the mass corresponding to the atoms.

Question: What is the flame test?

Answer: The flame test is a qualitative test used in chemistry to help determine the identity or possible identity of a metal or metalloid ion found in an ionic compound.

Question: What is the indicator?

Answer: Indicator are substances whose solutions change color due to changes in PH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.

Question: explain chromyl chloride test?

Answer: The mechanism of cromyl chloride test is simple On reacting potassium dichromate with sulphuric acid, chromate trioxide is formed. The colour of chromate triozide varie from dark red to brown colour.

Question: how to distinguish ethane and ethene?

Answer: Take ethane and ethane in two separate test tubes and dissolve them in carbon tetrachloride solution. Pass bromine gas into the two test tubes. If the color of bromine gas is discharged, then that gas is ethane and if the color of gas remains the same, then that test tube contains ethane gas.

Question: Difference between distilled water and mineral water?

Answer: Mineral water contains minerals that are dissolved in it and is found naturally in the form of springs. On the other hand, distilled water is water that has been purified through distillation. Most of the minerals found in mineral water are calcium, iron, and sodium. These minerals are considered to be good for us.

Question: how we will prepare 5% solution of sucrose?

Answer: A higher strength solution will have more sucrose relative to the amount of water. This example describes the calculations to prepare 100g of a 5 percent sucrose solution.

Question: How to differentiate H2SO4 and HNO3 without any chemical test?

Answer: Add a few drops of barium chloride (BaCl22) to both of them.