------- surfactants perform well over a wide range water hardness and PH?
------- surfactants perform well over a wide range water hardness and PH?
Cationic | |
Neutral | |
Nonionic | |
Anionic |
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.
Chemistry mcqs
Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in-------?
Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in-------?
Nelsons cell | |
Voltaic cell | |
Daniel cell | |
Downs cell |
Without suction pump filtration is ---------?
Without suction pump filtration is ---------?
Slow process | |
All are possible | |
Rapid process | |
Fast process |
With impurities like P and S the open hearth furnace is lined with ?
With impurities like P and S the open hearth furnace is lined with ?
SiO2 | |
Fe2O3 | |
CaO MgO | |
FeO |
Why does Ethyl Alcohol show high boiling point then Acetone?
Why does Ethyl Alcohol show high boiling point then Acetone?
Due to high molecular weight | |
Due to its Low molecular weight | |
Due to its Acidic nature | |
Due to Hydrogen bonding |
Why do we determined the boiling point of a liquid?
Why do we determined the boiling point of a liquid?
To Check temperature | |
To check its Purity and nature | |
None of These | |
To check its Acidity and Basicity |
Who used the term Concentrationwindow to draw the arbitrary lines of demarcation
Who used the term Concentrationwindow to draw the arbitrary lines of demarcation
Schwartz | |
Dr.A.Walash | |
S.E.Manhan | |
Einstein |
Who made volume and pressure correction to explain deviation of gases from ideal behaviour ?
Who made volume and pressure correction to explain deviation of gases from ideal behaviour ?
Charles | |
Boltzman | |
Clausius | |
Vander waal |
Which type of bond is formed by overlap of p orbitals --------?
Which type of bond is formed by overlap of p orbitals --------?
Both | |
Pi | |
Sigma | |
Neither |
Which substance can be used for disinfecting water ?
Which substance can be used for disinfecting water ?
Ozone | |
All | |
KMnO4 | |
Alums |
Which statement is wrong ?
Which statement is wrong ?
the amount of ozone layer is greater in the region close to the equator | |
CFCs play effective role in removing O3 in the stratosphere | |
in the equatorial region it acts as pollutant | |
ozone acts as filter for UV radiations |
Which statement is incorrect about catalyst----------?
Which statement is incorrect about catalyst----------?
it affects specific rate constant | |
decrease activation energy | |
it is used in smaller amount | |
specific in action |
Which statement is consistent with Hunds rule ?
Which statement is consistent with Hunds rule ?
The electrons in the same atom cannot have the same four quantum numbers | |
Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin. | |
There is maximum of two electrons is an orbital. | |
None |
Which state of matter has the lowest density ?
Which state of matter has the lowest density ?
Plasma | |
Gas | |
Solid | |
Liquid |
Which specie has unpaired electrons in antibonding molecular orbitals--------?
Which specie has unpaired electrons in antibonding molecular orbitals--------?
N2-2 | |
O2+2 | |
B2 | |
O2-2 |
Which solids are called true solids --------?
Which solids are called true solids --------?
Amorphous | |
Vitreous | |
Crystalline | |
Metallic |
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?
0.0002M HCI | |
0.4 mole of CH3COOH with 0.4 mole of NaOH | |
0.4 mole of NH3 with 0.2 mole of HCI | |
0.2 mole of NaCI with 0.2 mole of HNO3 |
Which set of quantum numbers is not allowed?
Which set of quantum numbers is not allowed?
n=2,l=1,m1=0,ms=+1/2 | |
n=2,l=1,m1-1,ms=+1/2 | |
n=2,l=0,m1=0,ms-1/2 | |
n=2,l=2,m1=1,ms-1/2 |
Which sequence of steps is correct for the manufacture of cement ?
Which sequence of steps is correct for the manufacture of cement ?
mixing heating grinding crushing | |
crushing heating mixing grinding | |
crushing mixing heating grinding and mixing | |
crushing grinding mixing heating |
Which Oxide of Manganese is amphoteric?
Which Oxide of Manganese is amphoteric?
MnO2 | |
Mn2O7 | |
Mn2O3 | |
MnO |
Which order of reaction obeys the relation t1/2 = 1/Ka----------?
Which order of reaction obeys the relation t1/2 = 1/Ka----------?
First order | |
Third order | |
Zero order | |
Second order |
Which one shows high %age of the ionic character ?
Which one shows high %age of the ionic character ?
H2O | |
HBr | |
HF | |
HCI |
Which one of the followings possesses melting point below 0°C?
Which one of the followings possesses melting point below 0°C?
Carbon | |
Bismuth | |
Phosphorus | |
Nitrogen |
Which one of the following will be sulphonated readily ?
Which one of the following will be sulphonated readily ?
Chlorobenzene | |
Nitrobenzene | |
Toluene | |
Benzene |
Which one of the following substances conducts electricity by the movement of ions ?
Which one of the following substances conducts electricity by the movement of ions ?
Molten sodium chloride | |
Mercury | |
Graphite | |
Copper |