Carnalite has chemical formula---------?
Carnalite has chemical formula---------?
CaCO3.MgCO3 | |
Na2B4O7.10H2O | |
KCI | |
KCI.MgCl2.6H2O |
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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Carnalite has chemical formula---------?
CaCO3.MgCO3 | |
Na2B4O7.10H2O | |
KCI | |
KCI.MgCl2.6H2O |
Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces--------?
Ester | |
Acidamide | |
Alkane | |
CO2 |
Carboxylic acid on reduction with HI / phosphorous yields---------?
ketones | |
alcohols | |
alkane | |
aldehydes |
Carbonates of lithium are not stable like that of sodium due to--------?
Low electropositivity | |
Low charge density | |
Low electronegativity | |
Not known yet |
As a substance moves from a solid to a liquid all of the following changes occur except ?
molecules become more disordered. | |
K.E of the molecules decreases | |
intermolecular forces become weaker. | |
molecules move more frequently. |
Arsenic oxides are removed by passing through---------?
Aluminium hydroxide | |
Calcium hydroxide | |
Sodium hydroxide | |
Ferric hydroxide |
Argon gas was discovered by----?
Dalton | |
Ramsay | |
Rayleigh | |
Lockerey |
Argillaceous material does not include--------?
vlay | |
slate | |
marine shells | |
blast furnace slag |
Aqueous solution of borax above 62°C gives crystals of--------?
Na2B4O7.4H2O | |
Na2B4O7.2H2O | |
Na2B4O7.10H2O | |
Na2B4O7.5H2O |
Apparent charge on atom in molecule is----------?
valency | |
coordination number | |
oxidation number | |
charge number |
Anything which increases rate of reaction without being involved in the reaction--------?
Catalyst | |
Inhibitor | |
All of the above | |
Promoter |
Any substance which accepts H+ is base favours the concept----------?
None of these | |
Lowrys | |
Arrhenius | |
Lewis |
Any process of chemical decay of metals due to the action of surrounding medium is called---------?
enameling | |
coating | |
corrosion | |
activation |
Carbon,Diamond and Graphite are together called:------?
Isotopes | |
Allotrope | |
Isomers | |
Isomorphs |
Carbon in wrought iron is present as-----?
Partly as iron carbide and partly as graphite | |
Iron carbide | |
Silicon carbide | |
Graphite |
Carbohydrates are polyhydroxy compounds of----------?
Aldehydes and ketones | |
Glucose | |
Glyceraldehydes | |
Oligosaccharides |
Capacity of one lead accumulator cell is----------?
2 volts | |
1.5 volts | |
1 volts | |
3 volts |
Cannizzaros reaction is not given by---------?
benzaldehyde | |
acetaldehyde | |
trimethyl | |
formaldehyde |
Cannizaros reaction takes place through the transfer of ---------- from complex anion?
hydride ion | |
methoxide ion | |
oxide ion | |
hydrogen ion |
Calculate % of N in KNO3-----?
18.56% | |
None of these | |
13.86% | |
14.34% |
Calcarious material includes---------?
lime stone | |
all of the above | |
chalk | |
marble |
By which method the molecular mass of benzene was determined as 78.108 ?
Vapour density method | |
Specific gravity method | |
Distillation methos | |
X-ray diffraction method |
By the addition of base in waterpH will be--------?
more than 7 | |
equal to 7 | |
no effect | |
less than 7 |
By decreasing the pressure the reaction will go to that direction where---------?
no. of moles of specie decreased | |
volume is decreased | |
heat absorbed | |
volume increased |
By combining n atmic orbitals no. of hybrid orbitals will be---------?
2 | |
3 | |
n | |
impossible to predict |