The rate of formation of ozone depends on the flux of:
The rate of formation of ozone depends on the flux of:
Ultra violet radiation | |
Infrared radiation | |
Gamma rays | |
visible radiation |
پاک اسٹڈی لائبریری اپنی خدمات کو بہتر کرنے کے لئے نئے سوفٹ وئیر انسٹال کررہی ہے ۔ اس لئے آئندہ کچھ دن آپ کو کچھ صفحات تک رسائی میں مشکلات کا سامنا ہوسکتا ہے ۔ جس کے لئے ہم معذرت خواہ ہیں۔
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The rate of formation of ozone depends on the flux of:
Ultra violet radiation | |
Infrared radiation | |
Gamma rays | |
visible radiation |
The rate of E1 reaction depends upon-----------?
the concentration of substrate | |
as well as nucleophile | |
the concentration of nucleophile | |
base as well as nucleophile |
The radioactive isotope of hydrogen is called------?
protium | |
tritium | |
ortho-hydrogen | |
deuterium |
The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of---------?
vaporization | |
sublimation | |
crystallization | |
evaporation |
The purpose of Smelting an ore is to----?
Oxidize it | |
Obtain an alloy | |
Separate volatile impurities | |
Reduce it |
The property which increases upto group IV-A then decreases on wards--------?
Ionization energy | |
Atomic volume | |
Melting & boiling points | |
Atomic radii |
The properties of an element mosly corresponds to that isotope which has greater---------?
all of the above | |
Relative abundance | |
Mass number | |
Atomic mass |
The processes of effusion and diffusion are best understand by--------?
Daltons law | |
Grahams law | |
Charles law | |
Avogadros law |
The process of polymerization was classified by----------?
W. H. Carothers | |
Sabatier | |
Strecker | |
Runge |
The process of fermentation of starch involve many enzymes the sequence of enzymes used are----------?
Diastase-maltase-zymase | |
Diastase-zymase-maltase | |
Zymase-maltase-diastase | |
Maltase-diastase-zymase |
The process of aluminium extraction is called---------?
Contact process | |
Thermite process | |
Hall process | |
Haber process |
The process in which solid changes directly into vapours without passing through liquid state?
None | |
Evaporation | |
Sublimation | |
Decantation |
The pressure during the molar heat of fusion is kept--------?
one atmosphere | |
10 atmosphere | |
2 atmosphere | |
0 atmosphere |
The preparation of benzene from acetylene can also be said as---------?
Condensation | |
Dehydration | |
Oxidation | |
Polymerization |
The practical problem in Hydrogen production is it:-------?
Valency | |
Chemical property | |
Size | |
Weight |
The potassium present in plant help the plant to----------?
form starch sugar and fibrous material | |
all the above statements are correct | |
ripen the seeds and fruits | |
increase the resistance against disease |
The phenomenon in which a compound exists in two or more crystalline forms is called --------?
Allotropy | |
Anisotropy | |
Polymorphism | |
Isomorphism |
The PH of the 1.3 × 10-4 NH4Cl is-----?
2.886 | |
3.886 | |
1.3 | |
4 |
The PH of the 0.0032 M H2SO4 is-----?
3.2 | |
4 | |
1 | |
2.198 |
The PH of Tears is -----?
8.2 | |
7.8 | |
7.4 | |
7 |
The PH of pure water at 25°C, kw=1×10-4------?
None of above | |
7 | |
14 | |
0 |
The pH of milk is----?
8 | |
12 | |
9 | |
6.5-7 |
The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is---------?
3 | |
2.7 | |
1.5 | |
2 |
The percentage of suspended solid waste in raw water is removed by coagulation is---------?
70 | |
60 | |
80 | |
90 |
The percentage of nitrogen in urea is--------?
56% | |
36% | |
46% | |
66% |