Which of the following set has all species isoelectronic---------?
Which of the following set has all species isoelectronic---------?
F – Cl – Br | |
Li+1 – Na+1 – K+1 | |
H+ – H- – H | |
F – Ne – Na+ |
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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Which of the following set has all species isoelectronic---------?
F – Cl – Br | |
Li+1 – Na+1 – K+1 | |
H+ – H- – H | |
F – Ne – Na+ |
Which of the following represents the correct electronic configuration of VII A group elements in the ground state ?
ns2p5 | |
ns2p4 | |
ns2p6 | |
ns2p2 |
Which of the following reagents will react with both aldehydes and ketones ?
Benedicts reagent | |
Tollens reagent | |
Fehlings reagent | |
Grignard reagent |
Which of the following reactions may be assoclated with aldehyde and ketone ?
oxidation | |
polymerization | |
all of the above | |
nucleophile addition |
Which of the following reaction is not shown by ketones ?
reaction with 2 4 dinitrophenyl hydrazine | |
reaction with HCN | |
reaction with NaHSO3 | |
reaction with Fehling solution |
Which of the following properties prove that cathode rays are material in nature---------?
they are negatively charged | |
they cast shadow | |
all of the above | |
they possess momentum |
Which of the following processes is used for the synthesis of cement ?
none | |
dry process | |
both | |
wet process |
Which of the following potassium fertilizers are more useful for horticultural crops tobacco & potatoes ?
K2SO4 | |
KCI | |
KMnO4 | |
KNO3 |
Which of the following possesses maximum hydration energy ?
Mg+2 | |
K+ | |
Na+ | |
Ca+2 |
Which of the following points are important in connection with equilibrium constant ?
Kc is constant at given temperature | |
Kc is unaffected by change in concentration of reactants or products | |
Kc indicates the extent of reaction but not about the rate of reaction. | |
All of the above |
Which of the following phenomenon is considered responsible for Global Warming?
D. Monsoon | |
A. Greenhouse effect | |
B. Fire in coal mines | |
C. Dry farming |
Which of the following oxides of iodine is used for quantitative analysis of CO ?
I4O2 | |
All are equally useful | |
I2O5 | |
I2O4 |
Which of the following orbitals has maximum penetration effect?
f | |
S | |
d | |
P |
Which of the following option is incorrect about gases ?
All molecules behave independently | |
All molecules move with same speed | |
PV / RT = n | |
All gases cannot be liquefied through Linds Method |
Which of the following noble gases is not present in atmosphere?
Helium | |
Xenon | |
Radon | |
Argon |
Which of the following noble gases is abundant in air?
Methane | |
Argon | |
Neon | |
Helium |
Which of the following molecule is polar---------?
none of the above | |
BF3 | |
CCI4 | |
CO2 |
Which of the following methods is used to estimate hydrogen in an organic compound ?
Combustion method | |
Dumas method | |
Kjeldahls method | |
All of the above methods are for different purposes |
Which of the following is used as water disinfectant to avoid the formation of toxic compounds---------?
Cl2 | |
both B & C | |
O3 | |
ClO2 |
Which of the following is typical transition metal ?
Co | |
Y | |
Sc | |
Cd |
Which of the following is true in the case of Zn-Cu cell ?
E0red of copper electrode is less than that of zinc electrode | |
The flow of electrons takes place from copper to zinc | |
All are correct | |
Zinc acts as an anode and copper as cathode |
Which of the following is the weakest reducing agent ?
HC | |
HI | |
HBr | |
HF |
Which of the following is the strongest acid ?
Water | |
Acetic acid | |
Formic acid | |
Propanoic acid |
Which of the following is the most suitable catalyst for ammonia synthesis ?
All of the above | |
Fe in fused mixture of Al2O3 + SiQ2 + MgO | |
ZnO + Cr2O3 | |
Pt |
Which of the following is the most reactive---------?
benzene | |
ethyne | |
ethane | |
ethene |