Question # 1

CH₃CH₂COOH is also named as:

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Propionic acid

Propanoic acid

Acetic acid

Both (a) & (b)

One of the best applications of Hess's law to calculate the lattice energy of ionic compound is

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Measurement of enthalpy change in a calorimeter

Studying of first law of thermodynamics

Measurement of a heat of formation of a compound

Born-Haber cycle

Large molecules with high molecular mass formed due to smaller units ae called:

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polymer

macromolecule

micromolecule

a & b

2,5-dimethyl-1-hexene has

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Two sp2 hybridized carbons

Six sp2 hybrid carbons

Two double bonds

Four pi electrons

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

Plastics are a pollution problem because many plastics

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are made from petroleum

are very inflammable

burn to produce toxic fumes

decompose to produce toxic products

The non polar gases of low polarizability have a very:

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Low critical temperature

Stable critical temperature

High critical temperature

For what value of Kc almost forward reaction is complete

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Kc.=10(-30)

Kc.=1

Kc = 10(30)

Kc,=0

Oceans, rivers, streams, leaks, polar ice caps, glaciers and group water reservoirs are included in

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Atmosphere

Lithosphere

Hydrosphere

Biosphere

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

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O₂gas

H₂gas

Na metal

Na₂O

Of the following four reactions, formic acid and acetic acid differ in which respect?

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Replacement of hydrogen by sodium

Formation of ester with alcohol

Reduction of Fehling solution

Blue litmus reaction

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

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C₂H₅OH

CH₃OH

CH₃COOH

C₂H₂

Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

Which one of the following has been hydroxyl and carboxylic acid groups

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Phenols

Picric acid

Phthalic acid

Salicylic acid

Choose the correct answer of transition elements?

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Transition elements have low melting points

Transition elements do not have catalytic activity

Transition elements exhibit variable oxidation states

Transition elements exhibit inert pair effect

Iodoethane reacts with sodium in ether, the product formed is

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Pentene

Propyne

Butene

Butane

The tip of the funnel should touch the side of the beaker in order to avoid :

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Splashing.

Leakage.

Mixing.

Contamination.

Which of the following is lighter

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Li

k

Na

Ca

Which of the following statement is not related to Solvay's process of Na₂CO₃

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Cheap materials

Pure product

Continuous process

Harmful by-products

Platinum (IV) chloride combines with ammonia to form compounds in which the coordination number of the platinum is 6. A formula unit on one of the compound contains a cation and only two chloride ions. What is the formula of this compound

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Pt(NH₃)₆CI₄

Pt(NH₃)₅CI₄

Pt(NH₃)₄CI₄

Pt(NH₃)₃CI₄

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