Question # 1

A pressure of 1Nm^-2 is equal to:

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one bar

one pascal

stalagmometer

one aomosphere

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

The value of R in term of dm³torr k^-1mol^-1

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62400

62.4

8.313

0.0821

Kinetic energy of one mole of an ideal gas at 300 K in kJ is

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34.8

3.48

3.74

348

Polar ice caps can melt due to

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Acid rain

Green House Effect

Smog

Chlorofluorocarbons

Benzene in the presence of AICl3 produces acetophenone when reacts with

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AcetyI chloride

EthyI benzene

Acetic acid

Ethanoic acic

In MgCl2, the oxidation state ofCI is

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Zero

-2

+2

-1

How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil

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by using water spray

by blowing air

by treating with EDTA and then flushing the heavy metal complex out of the soil

by adding CaO

The pH of neutral water is 6.8 then the temperature of H2O is

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25°C

More than 25°C

less than 25 C°

Not predicted

The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

Intermolecular forces exist between molecules of group 7 elements which of the following sequence represents the strength of the intermolecular forces?

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Cl₂> Br₂> I₂

Br₂> Cl₂> I₂

Cl₂> Br₂> I₂

I₂> Br₂> Cl₂

Coal is used to bake bricks in lime kiln:

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40%

60%

80%

None of these

Which of the element is not alkali metal

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Lithium

Rubidium

Francium

Magnesium

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

Which is not a calcarious material?

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Lime

Clay

Marble

Marine shell

The colour of a transition metal complex is due to d-d transition The colour of the complex is the complementary of the colour absorbed. Thus [Ti(H₂O₆]³⁺abosrbs yellow light and transmits blue and red colours therefore the solution of titanium complex appears

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Blue

Red

Yellow

Mixture of blue and red or violet

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

A and b only

Fossil fuels consist of :

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Coal

Natural gas

Petroleum

All of these

Increased asthmatic attacks in certain seasons are related to

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Inhalation of seasonal pollen

Eating of seasonal vegetables

Low temperature

Wet and dry environment

Which one of the following is not a buffer

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H₂CO₃+ NaHCO₃solution

H₃PO₄+ NaH₂PO₄solution

Hl + Nal solution

NH₄OH + NH₄CI solution

BiCl₃on hydrolysis forms a white precipitate of

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Bismuthio acid

Bismuth oxychloride

Bismuth pentachloride

Bismuth hydroxide

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

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