A solid may be made up of---------?
A solid may be made up of---------?
Ions | |
Molecules | |
A, B, and C | |
Atoms |
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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A solid may be made up of---------?
Ions | |
Molecules | |
A, B, and C | |
Atoms |
A single chlorine free radical can destroy how many ozone molecules ?
100 | |
100000 | |
10 | |
10000 |
A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?
78% Fe | |
74% Fe | |
77% Fe | |
75% Fe |
A safe and more reliable method for drying the crystal is---------?
Hot air currents | |
Vacuum desiccator | |
folds of filter paper | |
oven |
A real gas obeying vander waals equation will resemble the ideal gas if------------?
a is large and b is small | |
Both a and b are large | |
a is small and b is large | |
Both a and b are small |
A process used for the Concentration of Ore is----?
Electrolysis | |
Forth flotation | |
Distillation | |
Roasting |
A process controlled by Distributive law is---------?
Solvent extraction | |
Crystallization | |
Sublimation | |
Filtration |
A polymer in which three different monomers combine called-------?
Homopolymer | |
Copolymer | |
Biopolymer | |
Terpolymer |
A method of separation of components from its solution using Distribution law is ----------?
Solvent extraction | |
Sublimation | |
Crystallisation | |
Distillation |
A malleable solid is one which can be---------?
Converted into thin sheets | |
All of the above | |
Melted easily | |
Converted into wires |
A limiting reactant is one which--------?
gives the maximum amount of the product which is required | |
is taken in lesser quantity in volume as compared to other reactants | |
is taken in lesser quantity in grams as compared to other reactants | |
gives the minimum amount of the product under consideration |
A helium nucleus comprising of two protons and two neutrons with a charge of 2e is ----- ?
Beta particle | |
Alpha particle | |
Negative particle | |
Gamma particle |
A elements are named as alkali metals because--------?
Both A & B | |
Their oxide and hydroxides are water soluble | |
They are found in earth | |
Their oxides are basic |
A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?
C6H12O6 | |
C2H5O | |
C2H6O | |
C6H18O3 |
A catalyst can not effect---------?
Products | |
Chemical equilibrium | |
both A & B | |
Reactants |
A brivalent metal has the equivalent weighr of 12. The molecular weight to its oxide will be----?
32 | |
24 | |
40 | |
36 |
A 10 volume solution of H2O2 means----?
1mL of solution of H2O2 liberates 10 mL of O2 at STP | |
10 grams of H2O2 solution liberate 10 mL of O2 at STO | |
10 litres of H2O2 liberates 19 mL of O2 at STP | |
10 gram equivalents of H2O2 liberates 10 mL of O2 at STP |
95% ethanol is called---------?
absolute alcohol | |
methylated spirit | |
rectified spirit | |
wood spirit |
58.5g of of NaCl per 1 dm3 of solution of NaCl in water the concentration of solution will be----------?
0.1 N | |
1 M | |
0 | |
1 m |
50% inversion of configuration of molecules take place in a----------?
E2 – reaction | |
E1 – reaction | |
SN1 – reaction | |
SN2 – reaction |
2nd orbit is ------ away from nucleus of H-atom as compared to 1st orbit is ?
3-times | |
6 times | |
2-times | |
4-times |
18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ----------?
6 | |
5.1 | |
8 | |
one/fifty one |
10ml of alcohol dissolve in 90ml of water unit of concentration used is--------?
% v/v | |
% w/w | |
% v/w | |
% w/v |
1 mole of electron has mass in microgram---------?
1.84 x 10-4 | |
1.008 x 10-3 | |
5.5 x 10-4 | |
1.673 x 10-3 |
1 molar solution of glucose in water contains weight of glucose--------?
180g/dm3 | |
195g/dm3 | |
190g/dm3 | |
170g/dm3 |