Question # 1

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

^{The common oxidation number of halogens is}

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-1

+1

-2

0

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their

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Oxidation states

Reduction states

Electrode

Negative charges

Which of the following is an application of electrochemical series

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Prediction of the feasibility of chemical reaction

Calculation of the cell voltage

Prediction of reaction of metal with dilute acid

All of the above

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

Total number of valence electrons in CH4

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8

9

10

12

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

During the electrolysis of Fused NaCI, the products are

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Na and H2

Na and Cl2

Na and O2

H2 and Cl2

The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute

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Oxidation

reduction

Redox reaction

electrolysis

Which of the following best describes the shape and polarity of the carbon disulphide molecule?

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Bent and polar

Linear and non-polar

Pyramidal and polar

Bent and non-polar

The element with highest E°red

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N

F

O

CI

On ascending the electrochemical series strength as reducing agent

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Increases

Decreases

Remains same

not determinable

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

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