Question # 1

Graphite is ___________

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Hard

Nil

Soft

Nil

All ionic compound are ________________ at room temperature.

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Liquid

Solids

Gas

Plasma

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

Bucky molecules have ________________ c-atoms.

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20-60

20-90

40-60

40-100

The symbol of lead us

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As

Pb

Sb

Na

NaCl + H2O is ____________ solutions.

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Aqueous

Binary

H2O

Nil

H8+ _ Cl8- , the charge on H is.

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_

+

Neutral

Nil

In common, a solution has ___________ components.

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1

2

3

4

Potassium's atomic no. is :

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17

18

19

20

It is a strong electrolyte

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H2O

CH3COOH

NaOH

C6H6

Sort out a compound from the following

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Air

Salt

Ice-cream

Iron

Which disease cause when humans use water of industrial effluents.

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Cancer

Asthma

Jaundice

cholera

Main component of Natrual gas.

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CH₃

CH₄

C₂H₆

C₂H₂

Water dissolves Non-ionic compounds by:

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Ion-Ion forces

Dipole forces

Dipole - Dipole forces

Hydrogen Bonding

The plant use

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Carbon di oxide

Oxygen

Nitrogen

Sulphur

Benzene is formed by the polymerization of.

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Alkene

Alkane

Acetylene

Methane.

Proteins are polymers of.

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Polysaccharide

Oligosaccharids

Amino acid

Nucleic acid

When Bronsted and Lowry put forward acid base concept?

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1913

1923

1933

1943

Which gas is in involved in ozone depletion?

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Nitrogen

CFC's

Chlorine

All of them

Which one of the following salts makes the water permanent hard.

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NaCO₃

NaHCO₃

Ca(HCO₃)₂

CaSO₄

The end product of oxidation of acetylene is .

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Oxalic acid

Glyoxal

Glycol

None of these

Swimming pools are cleaned by a process:

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Hydrogenation

Bromination

Chlorination

Nitration

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

The velocity of photon is

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Independent of its wavelength

Depends on its wavelength

Equal to square of its amplitude

Depends on its source

An aqueous solution of ethanol is water has vaporu pressure.

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Equal to the of water

Equal to that of ethanol

More than that of H2O

Less than that of water

The deviation of a gas from ideal behavior is maximum at.

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-10 ^oC and 5.0 atm

-10^oC and 2 atm

0^oC and 2 atm

100^oC and 2 atm

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

Which of the following solutions will have the highest boiling point

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0.1 M NaCI

0.1 M CaCI₂

0.1 M FeCI₃

0.1 M glucose

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 one of the following molecules is paramagnetic.

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H2

He

N2

O2

The number of bonds in nitrogen molecules is.

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One pi and one sigma

One pi and two sigma

Thre sigma only

Two pi and one sigma

Which of the following will have the same number of molecule at STP.

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280 cm3 CO2 and 280 cm3 of N2O

11.2 dm3 of O2 and 32 g of O2

44 g of CO2 and 11.2 dm3 of CO

28 g of N2 and 5.6 dm3 of oxygen

In zero order reaction, the rate is independent of

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Temperature of reaction

Concentration of reactants

Concentration of products

None of these

Which one of the followings is not observed in the combustion of pure methane in a plentiful supply of air

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Water in produced

CO2 is produced

The flame is smoky

Energy is released

The ore CaSO4.2H2O has the general name.

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Gypsum

dolomite

Calcite

Epsom salt

Which halogen occurs naturally in a positive oxidation state

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Fluorine

Chlorine

Bromine

Iodine

Select from the following the one which is Alcohol

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CH₃CH₂OH

CH₃OCH₃

CH₃COOH

CH₃.CH₂.Br

Phenol can be prepared from chlorobenzene by

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Williamson synthesis

Down's process

Kolbe reaction

Cannizzaro reaction

The substance that retard the activity of enzyme is called.

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Co enzyme

Epo enzyme

Activity

Substrate

Which one of the following gases is used welding purpose usualy.

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Methane

Ethane

Ethene

Acetylene

The colour of transition metal complexes is due to

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d-d transition of electrons

Paramagnetic nature of transition elements

Ionization

Loss of s -electrons

Magnesium metal does not burn in the jar of

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N2

O2

Ne

N2 and O2

f - block elements are also called.

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Non typical transition elements

Outer transition elements

Inner transition elements

None of true

Which substance is used ot bleach the pulp.

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Na2SO3

NaCl

NaClO

NaOH