Question # 1

Lithum silicide reacts with concentrated hydrochlric acid to give lithium chlride along with.

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H2 and SI

Si H 4 gas

Disilane gas

Si3H8

The substance added to the soil in very small amounts are called.

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Macronutrients

Micronutrients

Fertilizers

None of these

Earth is protected from U.V. radiations by

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Carbon dioxide layer

Oxygen layer

Ozone layer

Troposphere

The property measured in DTA is

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Heat effects

Weight loss

Rate of change in weight

Change in temperature

Which of the following is a pseudohalide.

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I3-

IF7

CN-

ICI

For each value of l. the number of m velocity are.

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n²

2l

(2l+1)

(n+1)

Bioconversion of biomass can be used for.

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Heating purposes

Power production

Methane production

All of the above

In propagation step the reaction intermediate of radical polymerization is

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Carbocation

Carbonion

Free radical

Carbene

The pKa of an acid having ionization constant 1 x 10^-5 is

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-5

5

9

-9

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

The electrical conductivity of a nano tube is __________ times that of copper.

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10

100

1000

1/100

The function of boiling the sodium extract with conc. HNO3 before testing the halogens is

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To make solution clear

To make the solution acidic

To bring common ion effect

To destroy CN- and S2- ion

Ground water is threatened with pollution from which of the following source.

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Domestic wastes

Industrial wastes

Agricultural wastes

All above

Which of the following is not a component of HPLC system.

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Pumps

Columns

Particle collector

Injection system.

1 meter = ___________ nm

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10⁹

10^-9

10¹⁰

10^-10

Which of the following process is used for the conversion of matte is to nickel.

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Orford process

Mond's process

Electrolytio process

All

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

The only oxidation state of alkali metals in their compounds is.

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+1

+2

-1

0

Which of the following has the greatest metallic character.

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Na

Mg

Al

Si

When propyne is treated with equeous H2SO4 in the presence of HgSO4 the functional isomer of the major product obtained in.

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Propanal

Acetone

Propane 2 -nl

Propanol

Which of the following radical is a member of VI group.

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Mg²⁺

Na+

K+

NH₄⁺

All above

Which of the following statements is not true with respect to atomic spectroscopy.

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Atoms are simplest form of matter

Atoms cannot rotate or vibrate as molecules do

Only electronic transitions within atoms take place

Band spectra are observed

Which of the following group will have hyper conjugation effect when attached to benzene.

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------ CH3

----C6H5

------C(CH3)3

---------CH(CH3)2

Which of the following hydroxides is most stable.

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Mg (OH)2

Ca(OH)2

Sr (OH)2

Ba (OH)2

Casionic polymerization is initiated by

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BF3

NaNH2

Bul

Both b and c

Cytosine a pyrimidine base pairs with

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Guanine

Thymine

Adenine

Any of these

Enfleurage process is used to extract the essential oils from

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Back of plant

Seeds of plant

Leaves of plant

Flowers of plant

Which among the following is a false statement.

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SiO2 has a structure similar to that of CO2

Natural Si exists only in the combined state

Si can be prepared by reducing SiO2 with Mg

Si does not exist in graphite like structure, but exists only ni diamond like structure.

Which of the following is renewable resources of energy.

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Hydropower

Wind power

Solar power

All above

Lime water is an aqueous solution of.

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MgSO4

Ca (OH)2

CaCO3

CaSO4

Which of the following trihalides of nitrogen behaves as the weakest base.

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NF3

NCl3

NBr3

NI3

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