Question # 1

Which alcohol gives only one oxidation product when wormed with dil acidified K₂Cr₂O₇

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Butan-1-ol

Butan-2-ol

2-methyl propan-1-ol

2-methyl propan-2-ol

The formation of compounds like PF₅, BCI₃, SF₆indicates that

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These halides are ionic

These halides are covalent

They are Lewis acids

Octet rule not obeyed so the rule is not universal

Acetylene gives

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White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2

White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12

White ppt. with both

Red ppt. with both

Phosphate pollution is caused by

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Weathering of phosphate rocks only

Agricultural fertilizers

Phosphate rocks and sewage

Sewage and agricultural fertilizers

At present oil refineries in Pakistan are:

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One

Two

Three

Four

6-d series is in the period :

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4th

5th

6th

7th

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

Absolute alcohol is obtained by adding rectified apirit in alcohol:

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Water

Na₂CO₃

NaOH

CaO

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

The molarity of solution containing 14.5 grams urea (N₂H₄CO) dissolved in 100 cm³of the solution is

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1 molar

0.1 molar

0.2 molar

0.25 molar

Which of the following is not correct about transition metals?

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Their melting and boiling points are high

Their compounds are generally coloured

They can form ionic or covalent compounds

They do not exhibit variable valency

Sintered glass is a porous material use for :

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Absorpton

Decoration.

Filtration.

All of above.

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0.02

0.2

50

25

Precipitation will occur until the ionic product becomes

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Equal to K_sp

Lesser than K_sp

Greater than K_sp

None of these

Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as

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Wurtz reaction

Frankland's reaction

Cannizaro reaction

Kalobe's reaction

The standard enthalpy change in the formation of 1 mole of a compound from its elements in their standard physical states is

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Enthalpy of formation

Enthalpy of atomization

Enthalpy of neutralization

Internal energy change

Which structure shows a primary alcohol

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The presence of a double bond in a compound in the sign of:

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Saturation

Unsaturation

Subsitution

None

Which element does not belong to 4d series

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Y

Zr

Mo

Zn

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Adding 2(ii) + 3(iii) and subtracting i

Add i + ii + iii

Add i - ii + iii

Add i - ii - iii

Calculate the amount of charge flowing in 2 minute in a wire of resistance 10Ωwhen a potential difference of 20 V is applied

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120 C

240 C

20 C

4 C

Law of mass action states that rate of chemical reaction is directly proportional to the product of active masses of the reactants. The term active mass means

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Mass in grams converted to products

Number of moles

Number of moles per dm³of reactants

Total pressures of the reactants

Cannizzaro's reaction in not given by

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Formaldehyde

Acetaldehyde

Benzaldyhyde

Trimethylacetaldehyde

Which compound is called a universal solvent?

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H₂O

CH₃OH

C₂H₅OH

CH₃----O---CH₃

The iron obtained from blast furnace is

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Pig iron

Wrought ion

Soft ion

Steel

______ is used in breathing equipments for mountaineers and in space craft

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Li₂O

BeO

N₂

KO₂

Standard reduction of Zn = -0.76 V and that of Ni is -0.25 V. On coupling them by a salt bridge which of these will act as anode

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Salt bridge will act as anode

Zn will act as anode

Ni will act as anode

None of these

According to modern theory of chemical bonding atoms form bonds as it leads to a:

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Increase in energy.

No energy change.

Decrease in energy.

First decrease then increase in energy.

Alkyl halides on treatment with metallic Na give

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Alkynes

Alkenes

Alkanes

Alcohols

In a lime kiln, to get higher yield of CO₂, the measure that can be taken is

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To main high temperature

To pump out CO₂

To remove Cao

To add more CaCO₃

C₂H₅OH can be differentiated from CH₃OH by

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Reaction with HCl

Reaction with NH₃

Iodoform test

Solubility in water

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