Chemistry Mcqs Test Preparation for ECAT & MCAT - Set 11

1)   Potential of SHE is considered as

a. zero
b. unity
c. constant
d. multiple of 1
Answer  Explanation 

ANSWER: zero

Explanation:
No explanation is available for this question!


2)   Chemical used in salt bridge is

a. KOH
b. KCI
c. KNO3
d. KBr
Answer  Explanation 

ANSWER: KCI

Explanation:
No explanation is available for this question!


3)   Electrode potential of Zn is

a. oxidation
b. reduction
c. oxidation-reduction
d. depends on the nature of the coupled electrode
Answer  Explanation 

ANSWER: depends on the nature of the coupled electrode

Explanation:
No explanation is available for this question!


4)   List of elements based on hydrogen scale is called

a. periodic table
b. groups
c. periods
d. electrochemical series
Answer  Explanation 

ANSWER: electrochemical series

Explanation:
No explanation is available for this question!


5)   The element that act as anode always have _______ position in electrochemical cell

a. higher
b. lower
c. in middle
d. no effect of position
Answer  Explanation 

ANSWER: higher

Explanation:
No explanation is available for this question!


6)   In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be

a. greater
b. lesser
c. sum of reduction and oxidation potentials
d. none
Answer  Explanation 

ANSWER: greater

Explanation:
No explanation is available for this question!


7)   Greater value of standard reduction potential greater will be tendency

a. to get oxidized
b. to get reduced
c. to accept electrons
d. both b and c
Answer  Explanation 

ANSWER: both b and c

Explanation:
No explanation is available for this question!


8)   Greater value of standard reduction potential smaller will be tendency

a. to form positive ions
b. to form negative ions
c. gain electrons
d. all are possible
Answer  Explanation 

ANSWER: to form positive ions

Explanation:
No explanation is available for this question!


9)   Secondary cell is

a. rechargeable
b. non rechargeable
c. electrolytic cell
d. Daniel cell
Answer  Explanation 

ANSWER: rechargeable

Explanation:
No explanation is available for this question!


10)   Lead accumulators are

a. secondary cell
b. primary cell
c. voltaic cell
d. both a & c
Answer  Explanation 

ANSWER: both a & c

Explanation:
No explanation is available for this question!


11)   Density of H2SO4 in lead accumulator is

a. 1.25g/cm3
b. 1.3g/cm3
c. 1.20g/cm3
d. 1.15g/cm3
Answer  Explanation 

ANSWER: 1.25g/cm3

Explanation:
No explanation is available for this question!


12)   Capacity of one lead accumulator cell is

a. 1.5 volts
b. 2 volts
c. 3 volts
d. 1 volts
Answer  Explanation 

ANSWER: 2 volts

Explanation:
No explanation is available for this question!


13)   In alkaline battery the anode is made up of

a. MnO2
b. Zn
c. AgO2
d. cadmium
Answer  Explanation 

ANSWER: Zn

Explanation:
No explanation is available for this question!


14)   The strength of solution of an element whose electrode potential is to be measured is

a. 2M
b. 1N
c. 1m
d. 1M
Answer  Explanation 

ANSWER: 1M

Explanation:
No explanation is available for this question!


15)   Apparent charge on atom in molecule is

a. valency
b. coordination number
c. oxidation number
d. charge number
Answer  Explanation 

ANSWER: oxidation number

Explanation:
No explanation is available for this question!


16)   Voltaic cell is a

a. irreversible cell
b. reversible cell
c. alkaline cell
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


17)   In K2Cr2O7 the oxidation number of chromium is

a. 7
b. 6
c. -7
d. -6
Answer  Explanation 

ANSWER: 6

Explanation:
No explanation is available for this question!


18)   Percentage of sulphuric acid in lead accumulator is

a. 40%
b. 25%
c. 30%
d. 50%
Answer  Explanation 

ANSWER: 30%

Explanation:
No explanation is available for this question!


19)   The reduction potential Zn is

a. 0.76
b. -0.76
c. -0.55
d. 0.55
Answer  Explanation 

ANSWER: -0.76

Explanation:
No explanation is available for this question!


20)   The half cells are interconnected through

a. wire
b. salt bridge
c. electric circuit
d. no connection exists
Answer  Explanation 

ANSWER: salt bridge

Explanation:
No explanation is available for this question!


21)   The word Alkali means

a. Base
b. Basic salt
c. Ashes
d. Spirit
Answer  Explanation 

ANSWER: Ashes

Explanation:
No explanation is available for this question!


22)   Formula of Chile saltpetre is

a. NaNO3
b. CaCO3
c. Ba (NO3)2
d. NH4Cl
Answer  Explanation 

ANSWER: NaNO3

Explanation:
No explanation is available for this question!


23)   The oxides of beryllium BeO is

a. Acidic
b. Basic
c. Amphoteric
d. Neutral
Answer  Explanation 

ANSWER: Amphoteric

Explanation:
No explanation is available for this question!


24)   Which element is necessary for normal leaf development?

a. Si
b. Ba
c. Mg
d. Ca
Answer  Explanation 

ANSWER: Ca

Explanation:
No explanation is available for this question!


25)   Li is different from its family members due to

a. small size
b. high charge density
c. less electropositivity
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


26)   Carbonates of lithium are not stable like that of sodium due to

a. Low electronegativity
b. Low electropositivity
c. Low charge density
d. Not known yet
Answer  Explanation 

ANSWER: Low electropositivity

Explanation:
No explanation is available for this question!


27)   Nitrates of which pair of elements give different products on thermal decomposition?

a. Na K
b. Mg Ca
c. Li Na
d. Li Ca
Answer  Explanation 

ANSWER: Li Na

Explanation:
No explanation is available for this question!


28)   Which one of the following is not an alkali metal?

a. Francium
b. Caesium
c. Rubidium
d. Radium
Answer  Explanation 

ANSWER: Radium

Explanation:
No explanation is available for this question!


29)   Which of the following sulphates is not soluble in water?

a. Sodium sulphate
b. Potassium sulphate
c. Zinc sulphate
d. Barium sulphate
Answer  Explanation 

ANSWER: Barium sulphate

Explanation:
No explanation is available for this question!


30)   The element cesium bears resemblance with

a. Ca
b. Cr
c. Both of the above
d. None of the above
Answer  Explanation 

ANSWER: None of the above

Explanation:
No explanation is available for this question!


31)   The ore CaSO4.H2O has the general name

a. Gypsum
b. Dolomite
c. Calcite
d. Plaster of Paris
Answer  Explanation 

ANSWER: Gypsum

Explanation:
No explanation is available for this question!


32)   Downs cell is used to prepare

a. Sodium carbonate
b. Sodium bicarbonate
c. Sodium metal
d. Sodium hydroxide
Answer  Explanation 

ANSWER: Sodium metal

Explanation:
No explanation is available for this question!


33)   Ammonia may be prepared by heating ammonium chloride with

a. Water
b. NaCl
c. Aqueous sodium hydroxide
d. H2SO4
Answer  Explanation 

ANSWER: Aqueous sodium hydroxide

Explanation:
No explanation is available for this question!


34)   Crystals of Na2CO3. 10H2O when exposed to air

a. Lose water and remain solid
b. Gain water and remain solid
c. Gain water and become liquid
d. Remains unchanged
Answer  Explanation 

ANSWER: Lose water and remain solid

Explanation:
No explanation is available for this question!


35)   Which one of the following substances conducts electricity by the movement of ions?

a. Graphite
b. Copper
c. Molten sodium chloride
d. Mercury
Answer  Explanation 

ANSWER: Molten sodium chloride

Explanation:
No explanation is available for this question!


36)   Which one of the following gives white precipitate with aqueous solution of BaC?2?

a. NaHCO3
b. NaNO3
c. Na2CO3
d. Na2CrO4
Answer  Explanation 

ANSWER: Na2CO3

Explanation:
No explanation is available for this question!


37)   Which one of the following carbonate is water insoluble?

a. Na2CO3
b. K2CO3
c. (NH4)2CO3
d. CaCO3
Answer  Explanation 

ANSWER: CaCO3

Explanation:
No explanation is available for this question!


38)   The deliquescence is a property in which a solid

a. Absorbs moisture and remains solid
b. Absorbs moisture and turns to liquid form
c. Loses water of crystallization
d. Increases the number of water of crystallization
Answer  Explanation 

ANSWER: Absorbs moisture and turns to liquid form

Explanation:
No explanation is available for this question!


39)   In diaphragm cell hydrogen is discharged by the reduction of

a. Water
b. HCI
c. Na+
d. NaCl
Answer  Explanation 

ANSWER: Water

Explanation:
No explanation is available for this question!


40)   In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents

a. Hydroxide ions to reach anode
b. Chlorine gas to mix
c. Cathode to decay
d. All of the above
Answer  Explanation 

ANSWER: Hydroxide ions to reach anode

Explanation:
No explanation is available for this question!


41)   Gypsum is applied to the soil as a source of

a. Ca and P
b. S and P
c. Ca and S
d. we could not apply
Answer  Explanation 

ANSWER: Ca and S

Explanation:
No explanation is available for this question!


42)   Alkali and alkaline earth metals impart colours when heated over burner. It is due to

a. Smaller electronegativity of alkali metals
b. Smaller ionic radius of these metals
c. De-excitation of electrons from higher energy levels to low energy level
d. Excitation of electrons from low energy levels to higher energy levels
Answer  Explanation 

ANSWER: De-excitation of electrons from higher energy levels to low energy level

Explanation:
No explanation is available for this question!


43)   Which one of the following alkali metals forms only normal oxide when it reacts with O2?

a. Lithium
b. Sodium
c. Potassium
d. Rubidium
Answer  Explanation 

ANSWER: Lithium

Explanation:
No explanation is available for this question!


44)   First ionization potential of alkaline earth metal is greater than alkali metals because

a. They are more reactive
b. They have greater atomic radii
c. They have smaller atomic sizes
d. All
Answer  Explanation 

ANSWER: They have smaller atomic sizes

Explanation:
No explanation is available for this question!


45)   Which one of the following pairs shown diagonal relationship in the periodic table?

a. Sodium and Lithium
b. Lithium and magnesium
c. Lithium and beryllium
d. Boron and Beryllium
Answer  Explanation 

ANSWER: Lithium and magnesium

Explanation:
No explanation is available for this question!


46)   NaOH is named as caustic soda because

a. It corrodes the organic tissues
b. It is used in soda water
c. It reacts with chlorine gas
d. It reacts with fats to form soap
Answer  Explanation 

ANSWER: It corrodes the organic tissues

Explanation:
No explanation is available for this question!


47)   Sodium is not observed in +2 oxidation state because of its

a. high first ionization potential
b. high second ioniation potential
c. high ionic radius
d. high electronegativity
Answer  Explanation 

ANSWER: high second ioniation potential

Explanation:
No explanation is available for this question!


48)   Carnalite has chemical formula

a. KCI
b. KCI.MgCl2.6H2O
c. Na2B4O7.10H2O
d. CaCO3.MgCO3
Answer  Explanation 

ANSWER: KCI.MgCl2.6H2O

Explanation:
No explanation is available for this question!


49)   Magnesium metal does not burn in the vessel containing

a. N2
b. O2
c. N2 and O2
d. Ne
Answer  Explanation 

ANSWER: Ne

Explanation:
No explanation is available for this question!


50)   Electrolysis of dilute solution of NaCl results at the anode

a. sodium
b. hydrogen
c. chlorine
d. oxygen
Answer  Explanation 

ANSWER: oxygen

Explanation:
No explanation is available for this question!