Chemistry MCQs

Page No. 39

Which ion will have maximum value of heat of hydration ?


aAl+3

✓


bCs+

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cBa+

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dMg+2

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View Answer Al+3

Electrolysis of dilute solution of NaCl results at the anode_______________?


asodium

✖


bhydrogen

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cchlorine

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doxygen

✓


View Answer oxygen

Carnalite has chemical formula__________________?


aKCl

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bKCI.MgCl2.6H2O

✓


cNa2B4O7.10H2O

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dCaCO3.MgCO3

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View Answer KCI.MgCl2.6H2O

NaOH is named as caustic soda because________________?


aIt corrodes the organic tissues

✓


bIt is used in soda water

✖


cIt reacts with chlorine gas

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dIt reacts with fats to form soap

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First ionization potential of alkaline earth metal is greater than alkali metals because___________________?


aThey are more reactive

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bThey have greater atomic radii

✖


cThey have smaller atomic sizes

✓


dAll

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Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?


aSmaller electronegativity of alkali metals

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bSmaller ionic radius of these metals

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cDe-excitation of electrons from higher energy levels to low energy level

✓


dExcitation of electrons from low energy levels to higher energy levels

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In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________?


aHydroxide ions to reach anode

✓


bChlorine gas to mix

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cCathode to decay

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dAll of the above

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The deliquescence is a property in which a solid____________________?


aAbsorbs moisture and remains solid

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bAbsorbs moisture and turns to liquid form

✓


cLoses water of crystallization

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dIncreases the number of water of crystallization

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Which one of the following gives white precipitate with aqueous solution of BaCl2?


aNaHCO3

✖


bNaNO3

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cNa2CO3

✓


dNa2CrO4

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View Answer Na2CO3

Crystals of Na2CO3. 10H2O when exposed to air_________________?


aLose water and remain solid

✓


bGain water and remain solid

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cGain water and become liquid

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dRemains unchanged

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