Chemistry MCQs

Page No. 50

Which one of the following element has highest oxidation state in its compounds ?


aCr


bMn


cSn


dO


View Answer Mn

True increasing order of acidity of the oxides of Mn is_________________?


aMnO < MnO2 < Mn2O7


bMn2O7 > MnO2 > MnO


cMnO2 > MnO > Mn2O7


dMnO2 > Mn2O7 > MnO


View Answer Mn2O7 > MnO2 > MnO

Which of the following possesses maximum hydration energy ?


aNa+


bK+


cMg+2


dCa+2


View Answer Mg+2

Melting points of VII-A group elements down the group ____________________?


aIncrease


bDecrease


cRemain constant


dNo regular trend


View Answer Increase

Higher value of electron affinity means__________________?


aAtom will lose electron easily


bAtom will gain electron easily


cAtom may form di-positive ion


dThe reason is unknown



Shielding effect across the period_________________?


aIncreases


bDecreases


cCan not be predicted


dRemains constant


View Answer Remains constant

The atoms of same element having same atomic number but different mass number are called____________________?


aIsobars


bIsomers


cIsotopes


dIsotropes


View Answer Isotopes

Which of the following ion is stable in aqueous solution ?


aH+


bH-


cCl-


dAll are stable


View Answer Cl-

An element has electronic conviguration 1s2 2s2 2p2. It belongs to__________________?


aGroup II-A


bGroup IV-A


cGroup VII-A


dGroup VI-A


View Answer Group IV-A

The atomic radii decreases by increasing atomic number in________________?


aAlkali metal


bAlkaline earth metal


cElements from Li to Ne


dHalogens



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