Question # 1

When a chemical reaction is carried out with a substancZ; a gas is produced which turns red litmus paper blue. What is the reaction?

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Reaction of an acid with a meal carbonate

Reactin of an alkali with ammonium salt

Reaction of an acid with ammonium salt

None of these

Unit of atomic size is

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pm

nm

kJmol-1

Both a and b

Keeping in view the intermolecular forces of attraction, indicate which compound has the highest boiling point

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H₂S

HF

NH₃

H₂O

Whcih element is presnet in 2nd period.

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Lithium

Beryllium

Boron

All of these

Which one of the example of colloid.

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Paints

Milk of magnesia

Jelly

None of these

The nucleus of an atom is composed of

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Electrons

Electons and protons

Protons and neutrons

Electrons and neutrons

Which are good conductor of heat and electricity

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Metals

Non metals

Metalloids

All of these

The colour of hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

An atom having six electonsin its valence shell will achieve noble gas electronic confguration by

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Gainign one electron

Gaining two electrons

Losing all electrons

Losing two electrons

Nitrogen molecule contains.

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Polar covalent bond

Triple Covalent bond

Double covalent bond

Single covalent bond

In the formation of AlF₃, aluminum atom loses........electrons.

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1

4

3

2

Which are called paraffines?

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Alkyle

Alkynes

Alkenes

Alkanes

Extraction of metals from its ores is called.

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Metallurgy

Mining

Griding

All

Which one of the following cannot by hydrolyzed?

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Polysacchrides

Monosacchrides

Oligosacchrides

All of these

The color of Iodine is:

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Purple

Black

Red

Pink

Nucleic acids made up of long chain of.

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Nucleotide

Fatty acids

Amino acid

None of them

Catalytic converters convert.

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CO to CO₂

N₂ to NO

CO₂ to CO

N₂to NO₂

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

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Proton

Electron pair

Neutron

Electron

Halogenation of methane produces following valuable chemical compounds used as solvents except.

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Carbonterachloride

Chloroform

Carbon Black

Chloromethane

Arrhenius presented his concept about acids and bases in.

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1785

1787

1923

1930

Compound of metal exist under earth crust are called.

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Ore

Gangue

Minral

None of these

Temporary hardness is due to the presence of bicarbonates of.

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Calcium

Magnsium

Both of them

None of them

Which one of the following aqueous solutions has the highest pH

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0.1 M NaOH

0.1 M HCl

0.2 M H2SO4

0.1 M HNO3

Tin has Isotopes

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7

9

11

5

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

During chromatography strip should be dipped into solvent mixture to a depth of.

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3-4 mm

4-5 mm

5-6 mm

6-7 mm

The substance which decrease the activity of a catalyst is called.

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Promoter

Activator

Inhibitor

Positive catalyst

The element nickel has isotopes.

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3

2

5

7

Long chains of amino acids are coiled about one another into a spiral by

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Covalent bond

Ionic bond

Hydrogen bond

Van Der Waal's forces

The separation of the different isotopes in the mass spectrometer is done on the basis of

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Different amounts of positive changes

Charge e/m value different amounts of negative changes

Different m/e value

Velocities of the ions

The Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

Two solutions of NaCl and KCl are prepared separately by dissolving same amount of the solute in water. Which of the following statements is true for these solution.

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KCl solution will have higher boiling pint than NaCl solution

Both the solutions have different boiling point

KCl and NaCl solutions possess same vapour pressure

KCl solution possesses lower freezing point than NaCl solution

In endothermic reactions, the heat content of the

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Products is more then that of reactants

Reactants is more than that of products

Both a and b

Reactant and products is equal

Which alkyl halide does not form Grignard's reagent.

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CH3-Br

CH3-Cl

CH3- F

CH3-I

In which substance phosphorus is not present.

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Yolk of egg

Bones

Apatite

Galena

When Cu reacts with conc. HNO3 , which one of the following gases is evolved

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N2O

NO

NO2

N2O5

Which has reddish brown colour.

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silver acetylide

Copper acetylide

BaSO4

Aqueous KMnO4 solution

Oxime is an addition product obtained when aldehydes react with.

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HCN

NH2OH

Phenyl hydrazine

H2O

Aldehyde react with hydroxyl amine in acidic solution to give

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An oxime

Aldol

Polymer

Acetic acid

Which type of coal has greater percentage of carbon.

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Peat

Lignite

Bituminous

Anthracite

How much does of methanol can cause death

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10-15 ml

15-20 ml

100- 250 ml

has no effect

A carboxylic acid contains

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A hydroxyl group

A carboxyl group

A hydroxyl and carboxyl group

A carboxyl and an aldehydic group

Which element forms on ion wiht charge 3+

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Beryllium

Aluminium

Carbon

silicon

The macro nutrients are required in ranging from

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5 kg to 200 kg

5 kg to 200 g

6g to 200 g

1 kg to 100 kg