Question # 1

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

Li belongs to ________________ block.

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s

p

d

f

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

Atoms reacts with each other because:

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They are attracted to each other

they are short of electrons

they want to attain stability

they want to disperse

The other name of modern periodic table is ________________ of periodic table.

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Long form

Simplified

Simplest

Nil

All ionic compound are ________________ at room temperature.

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Liquid

Solids

Gas

Plasma

Oxygen is ___________

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Metals

Non-metals

Gas

b & c

Intermolecular forces are of three types and are collectively called ____________

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Nelson' forces

Vander Waal's forces

Neurons

Nil

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

Non-metals are generally soft, but which one of the following is extremely hard?

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Graphite

Phosphorus

Iodine

Diamond

____________ agents gains electrons in chemical reaction.

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Reduction

Oxidation

Both

None of these

Smell of rancid butter is due to the presence of.

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Propanoic acid

Butanoic acid

Acitic acid

Citric acid

Hydrogen atoms preset in pentane are.

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10

12

14

16

Fertilizers are used to make up the deficiency of;

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oxygen and carbon

iron and magnesium

nitrogen and phosphorus

hydrogen and calcium

The salts of which element are present in detergent that causes the rapid growth of algae in water bodies is.

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Phosphate

Calcium

Sodium

All of them

For reactions having large Kc value, the reaction proceeds to:

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Completion

Equilibrium state

back ward

None of these

A base is a substance which neutralizes an acid which of these substances is not a base?

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Aqueous ammonia

Sodium chloride

Sodium Hydroxide

Calcium Hydroxide

Normally rain water is weakly acidic because of.

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SO₃ gas.

CO₂gas.

SO₂gas.

NO₂gas.

Which one is heterocyclic compound?

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Benzene

Cyclobutane

Thiophene

Nephthalene

A saturated solution of sodium chloride is called.

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Brine

Suspension

Colloidal

None of these

Hypoglycemia result due to:

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high cholesterol level

low cholesterol level

low sugar level in body

high sugar level in body

Ozone depletion was first noticed is.

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1970's

1980's

1990's

1960's

Oxidation number of carbon in NaHCO₃

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+4

-6

+6

+2

The pK_avalue of CH₃COOH is 4.74 when we mix CH₃COOH and CH₃COONa in the ratio of 10:1, tehn the pH of the buffer is

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4.74

5.74

3.74

7.00

The unit of the rate constant is the same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

More abundant isotope of an element is the one with.

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Even atomic number

Odd atomic number

Even mass number

Odd mass number

Ionic compound do nto show the phenomenon of Isomerism because bond are.

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Directional and rigid

Non directional and rigid

Non directional and non rigid

All above

In a electrolytic cell the electrons flow from

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Cathode to anode

Anode to cathode

From cathode to anode or opposite, depending upon the nature of electrolyte

All of the above

Which formula will be used to determine the number of in electrons sub shell of an atoms.

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2(l+1)

2(2l+1)

(l+1)

(2l+1)

When a reaction proceeds in a sequence of steps, the overall rate is determined by

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Fastest step

Slowest step

Order of different steps

Molecularity of all steps

The over all positive value for the reaction potential predicts that process is energetically.

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Not feasible

Feasible

Impossible

No indication

An ionic compound A⁺B^-is most likely to be formed when

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The ionization energy of A is high and electron affinity of B is low

The ionization energy of A is low and electron affinity of B is high

Both the ionization energy of A and electron affinity of B are high

Both the ionization energy of A and electron affinity of B are low

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 compound is called universal solvent

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CH₃OH

C₂H₅OH

CH₃O CH₃

H₂O

Magnesium metal does not burn in the jar of

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N2

O2

Ne

N2 and O2

The element of 2nd period, which has highest ionization energy from the following is

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Be

C

N

O

The mineral CaSO₄.2H₂O has the general name

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Dolomite

Gypsum

Calcite

Epsom Salt

Basicity of ortho phosphoric acid is.

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1

2

3

4

Which one does not belong to the alkaline earth metals

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Be

Ba

Ra

Rn

The basis of modern periodic table is

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Electron affinity

Atomic mass

Ionization Potential

Atomic number

Which one is chlorous acid

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HCIO

HCIO₂

HCIO₃

HCIO₄

Cement is a mixture of

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Clay and clinker

Clay, lime stone and gypsum

Lime stone and gypsum

Lime stone and clay

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

Preparation of vegetable ghee involves.

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Halogenation

Hydrogenation

Hydroxylation

Dehydrogenation