Question # 1

Which is deal with compositon, structure, properties, behavior and changes of matter and energy.

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Technology

Chemistry

Engineering

Science

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

According to Bronsted and Lowry concept, an acid is a substance that can donate.

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Proton

Electron pair

Neutron

Electron

What will happen if the rates of forward and reverse reactions are very high

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The reaction will be practiclly irreversible

The equilibrium point will reach very soon

The equilibiurm point will reach very late

The reaction will not attain the state of dynamic equilibrium

In which period and group yu will place the elemnt whic is an important part of the solar cell?

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Third period and Sixth a grop Group 16

Third priod and forth A group Group 14

Second period and forth A group Group

Third prod and fifth A group Group 15

During the glycolysis net ATP produced are.

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2

4

6

8

How many electons can be accommodated in S subshell?

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2

6

14

10

Emperical Formula of Glucose is

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CH2O

CHO

CHO2

C2HO

Matter can be described by both is

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Chemical Properties

Physical Properties

Physical propeties and chemcial properties

None of these

A bond pair is covalent molecules usually has.

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One electron

Two electron

Three electron

Four electron

The removal of electron from a neutral atom gives rise to.

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Molecular anion

Anion

Cation

Molecular Cation

The most important oligosaccharide is:

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Sucrose

Glucose

Fractose

Maltose

The end product of oxidation of acetylene is .

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Oxalic acid

Glyoxal

Glycol

None of these

Eggs oils and fats contain vitamin .

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A

B

C

D

Who proved that the presence of hydrogen as the main constituent of all acids.

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Lavoisier

Humphrey Davy

Dalton

Arrhenius

Plants produces by the photosynthesis process.

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Glucose

Fructose

Sucrose

Maltose

Acids turn

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Blue litmus red

Red litmus blue

Blue litmus green

Blue litmus blue

Equilibrium constant has no unit when number of moles of reactants and products are:

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same

Different

Both a and b

None of these

Which one of the following is not air pollutants?

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N₂

CO

NO₂

O₂

Alkanes give reaction only

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Addition

Decomposition

Substitution

Displacement

Which of one of the following is used as as fumigant:

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Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

The freezing point of water is:

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10 ^oC

100^oC

0^oC

46^oC

Which one of the following has the greater ionic characters in it.

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HF

HCl

H2O

H2

In which compound the oxidation number of Mw is +6

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KMnO4

K2MnO4

MnO2

MnO

The unit of rate constant depends upon

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Number of reactants

Concentration terms

Order of reaction

Molecularity of reaction

The charge on electron was determined by millikan in his oil drop experiment and its value is

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6.023 x 10^-23C

1.602 x 10^-23C

1.602 x 10^-19C

6.625 x 10^-34C

When a chemical reaction is completed the

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

Which statement about a molecule is incorrect.

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It exist independently

Molecules of a substances are similar

Hemoglobin is a homoatomic molecules

Oxygen molecule is a macromolecule

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Fe is reduced

Fe is oxidized

CI₂is oxidized

None of these

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

For the equilibrium system N2 + O2 + Heat = 2NO the equilibrium constant deceases by

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Decreasing the temperature

Adding a catalyst

Adding N2

Adding NO

A filtration process could by very time consuming if it were into aided by a gentle suction which is developed.

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If the paper covers the funnel upto its circumference

If the paper has got small sized pores in it.

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

Which woody raw material is used for the manufacture of paper pulp

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Cotton

Biogases

Rice straw

Poplar

The smog which have high contents of SO2 in it, is called.

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Reducing smog

Oxidizing smog

Natural smog

Neutral smog

Number of peptide bonds in tripeptide is

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1

2

3

4

Which one of the following products is not formed when acetic acid reacts with PCl5

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C2H5Cl

HCl

POCl3

CH3COCl

Fats are

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Saturated glycerides

Unsaturated glycerides

Polyhydroxy ketose

Polyhydroxy aldose

The percentage of nitrogen in urea is.

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36%

46%

56%

65%

An element that has high ionization energy and tends to be chemically inactive would most likely to be

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an alkali metal

a transition element

a noble gas

a halogen

Which substance is used ot bleach the pulp.

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Na2SO3

NaCl

NaClO

NaOH

Which one of the following is calcareous material

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Marine shells

clay

Shale

Blast furnace slag

According to Lewis concept, ethers behave as

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Acid

Base

Nucleophile

Solvent

Which is not an ore of iron

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haematite

Magnetite

limonite

Cassiterite