Which of the following will decompose to produce litharge---------?
Which of the following will decompose to produce litharge---------?
Pb2O | |
Pb3O4 | |
All of the above | |
PbO2 |
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۔
Pak Study Library is installing new software to improve its services. herefore, in the next few days, you may face difficulties in accessing some pages. sorry for the inconvenience.
Which of the following will decompose to produce litharge---------?
Pb2O | |
Pb3O4 | |
All of the above | |
PbO2 |
Which of the following will be acidic-------?
propyne | |
1-butyne | |
ethyne | |
all of the above |
Which of the following way in used for classification of chromatography ?
Shape | |
All | |
Mechanism | |
Phase |
Which of the following unit of concentration is independent of temperature ?
all | |
Molality | |
Mole fraction | |
Molarity |
Which of the following type of reaction is 3rd order reaction---------?
2FeCl3 + 6KI ? 2FeI2 + 6KCl + I2 | |
2N2O5 = 2N2O4 + O3 | |
None of these | |
NO + O3 ? NO2 + O2 |
Which of the following theories is superior to others---------?
VBT | |
MOT | |
VSEPR | |
none of the above |
Which of the following terms is used for the mass of chlorine 35.5 ?
relative atomic mass | |
atomic weight | |
relative isotopic mass | |
mass number |
Which of the following terms is not used for ionic compound ?
molecular formula | |
empirical formula | |
formula unit | |
formula mass |
Which of the following technique is used for the separation of insoluble particles from liquids ?
Filtration | |
Crystallization | |
Chromatography | |
Solvent extraction |
Which of the following technique is simple and efficient to purify a substance----------?
Sublimation | |
Filtration | |
Solvent extraction | |
Crystallization |
Which of the following sulphates is not soluble in water ?
Sodium sulphate | |
Potassium sulphate | |
Barium sulphate | |
Zinc sulphate |
Which of the following substances does not give iodoform test ?
acetaldehyde | |
ethyl alcohol | |
methyl alcohol | |
acetone |
Which of the following substance do not show continuous solubility curve ?
Na2SO4. 10H2O | |
K2Cr2O7 | |
PbCl2 | |
KCIO4 |
Which of the following statements is wrong about isotopes ?
they possess different physical properties | |
they possess different position in the periodic table | |
they possess different mass number | |
they possess same chemical properties |
Which of the following statements is true about plasma--------?
It may be the first state of matter | |
All of the above | |
It is a conductor of electricity | |
It is not a phase transition |
Which of the following statements is incorrect about halogens ?
All the halogens have electronic conviguration ns2p5 | |
All are non-metals | |
All the halogens react with noble gases to form their halides | |
They have high electron attinity and ionization energy |
Which of the following statements is incorrect about fluorine--------?
fluorine follows octet rule and as well as extended octet rule | |
fluorine has lowest dissociation energy among the halogens | |
fluorine is restricted to -1 oxidation state | |
both B and C |
Which of the following statements is false about transition metals?
All transition metal compounds are paramagnetic | |
They form coloured ions | |
They form complexes | |
They show variable valency |
Which of the following statements about isotopes is correct ?
Isotopes with odd atomic number and even mass number are abundant | |
Isotopes with even atomic number and even mass number are abundant | |
Isotopes with odd atomic number are abundant | |
Isotopes with even atomic number and odd mass no are abundant |
Which of the following solvents would best facilitate an SN2 substitution reaction?
Hexane | |
Water | |
Ethanol | |
Dimethylflormamide |
Which of the following solutions of H2SO4 is more concentrated ?
1 molal solution | |
all have same concentration | |
1 normal solution | |
1 Molar solution |
Which of the following solution has the highest boiling point ?
5.85% NaCl Solution | |
18.0 % glucose solution | |
6.0 % urea solution | |
All have same boiling point |
Which of the following solids show anisotropy----------?
None of the above | |
Plastic | |
Rubber | |
Glass |
Which of the following shows inert pair effect ?
boron | |
tin | |
carbon | |
silicon |
Which of the following shows electrical conduction---?
Diamond | |
Graphite | |
Sodium | |
Potassium |