Question # 1

The formula of borax glass is.

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Na2B4O7 10H2O

Na2B4O7 5H2O

Na B4 O7

None of above

An induction of dipole or polarity in non polar bond, and consequent electron shifting along a chain of atoms is known as.

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Inductive effect

Resonance effect

Hyper conjugation

None of the above

An indicator for an acid base titration is a

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Weak acid

Weak base

Strong acid

Strong base

Both A and B

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

Which of the following is not an alum.

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KAI (SO4)3 12 H2O

NaAI (SO4)2 12 H2O

NH4Fe (SO4)2 12H2O

FeAl (SO4)2 . 12 H2O

An example of nitro dyes is.

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Martius yellow

Auramine O

Malachite green

Methyl red

Which pair of species can undergo chemical reaction with each other.

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CO+ NO

LiH and H2O

CO2 and HCl

CaH2 and SI H4

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

Who proved that all the six hydrogen atoms in benzen are equivalent.

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Kekule

Ladenburg

Faraday

Wohler

The total number of crystal systems and the number of Bra via is lattices are.

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7,7

7,14

14,7

14,28

Which of the following is not true for metalloids.

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They are borderline elements

They usually act as electron during with non metals.

B, Si, and Ge

They are all solids at room temperature.

Recrystallization is the most common technique of purification of solid organic substances Which of the following statements is not related with characteristics of a suitable solvent.

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It dissolves the substance on heating

It readily allows it to separate out in the form of crystal on cooling

It does not react chemically with substance

It does dissolve the impurities.

Oxidation state of the chromium [Cr(NH3)6]3+ complex ion is

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+2

+3

+4

+5

Which of the following is the most stable towards heat.

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CaCO3

BaCO3

Na2CO3

MgCO3

Potentiometry is based on the measurement of which physical property.

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Electrical conductance

Electrical potential

Thermal conductance

Current

Which of the following statements is wrong.

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Covenant compounds are generally soluble is polar solvents.

Covalent compounds have low melting and boiling points

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H

The number of degrees of freedom and number of components for a system of containing undissolved salt , in equilibrium with water vapor are.

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2,2

3 , 2

1 , 1

1 , 2

If the activation energy in the forwarded direction of an elementary step is 52 kj and the activation energy in the reverse direction is 74 kj. What is the energy of reaction Delta E for this step

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22 Kj

-22 kj

52 kj

-52 kj

In nature nickel is found in the form of.

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Sulphides

Silicates

Arsenides

All

For a compound to act as a dye it must have

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A suitable colour

Ability to fix to fibre

Both A and B

None of these

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

Stablization of particles and their reactivity is affected by.

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Surface properties

Bulk properties

Regardless to the surface properties

No of particles

The process of extracting a metal in pure form its ores is known as.

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Crushing

Grinding

Dressing

Metallurgy

Which of the following substance is generally not considered an air polutant.

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CO

CO2

SO2

NO2

How many oxygen atoms lined up in a now would fit in a one nanometer speace.

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None an oxygen atoms is bigger than 1 nm

One

Seven

None of the above

Which of the following pollutants results from chemicals petroleum and paper industries.

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SO2

CO

Hydrocarbons

All above

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.

A covalent bond which is formed between two atoms by the overlap of atomic orbitals along their axis is called.

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Pi bond

Sigma bond

Polar bond

Non polar bond

Chlorofluorocarbon are widely used as coolants in.

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Air conditioners

Clearing solvents

Aerosol propellant's

All above

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