Chemistry MCQs

Page No. 50

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


aCr

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bMn

✓


cSn

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dO

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View Answer Mn

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


aMnO < MnO2 < Mn2O7

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bMn2O7 > MnO2 > MnO

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cMnO2 > MnO > Mn2O7

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dMnO2 > Mn2O7 > MnO

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View Answer Mn2O7 > MnO2 > MnO

Which of the following possesses maximum hydration energy ?


aNa+

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bK+

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cMg+2

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dCa+2

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View Answer Mg+2

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


aIncrease

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bDecrease

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cRemain constant

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dNo regular trend

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View Answer Increase

Higher value of electron affinity means__________________?


aAtom will lose electron easily

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bAtom will gain electron easily

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cAtom may form di-positive ion

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dThe reason is unknown

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Shielding effect across the period_________________?


aIncreases

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bDecreases

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cCan not be predicted

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dRemains constant

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View Answer Remains constant

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


aIsobars

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bIsomers

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cIsotopes

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dIsotropes

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View Answer Isotopes

Which of the following ion is stable in aqueous solution ?


aH+

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bH-

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cCl-

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dAll are stable

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View Answer Cl-

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


aGroup II-A

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bGroup IV-A

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cGroup VII-A

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dGroup VI-A

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View Answer Group IV-A

The atomic radii decreases by increasing atomic number in________________?


aAlkali metal

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bAlkaline earth metal

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cElements from Li to Ne

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dHalogens

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