Question # 1

In whcih state of matter does not hae definite shape and volume.

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Liquid

Gas

Solid

All of these

Which molecule contains a single vovalent bond.

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CH4

C2H4

C2H2

O2

Pure alkalis metals can be cut siply by knife but iron cannot bccause of alkali meals have

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Non metalic bonding

Strong metallic bonding

Weak metallic bonding

Moderate metqllic bonding

How doe electrons keep themselves away from the oppositely charged nucleus.

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A agnetic field around the nucleus keeps them away

By keeping themselves stationary

By revolving around the nucleus

Due to their wave like nature

During the formation of ionic bond heat is.

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Remains same

Absorbed

Released

Both a and b

If the Delta H value is negative then reaction witll be

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Endotermic

Exothermic

May or may not be exothermic or endothermic

None of these

Identify the covalent compund

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NaCl

H₂O

KF

MgO

/which of the followign elements is presnt in group IA.

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Lithium

Hydrogen

Sodium

All of these

Dative covalent bondis also known as

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Covalent bond

Ionic Bond

Metallic Bond

Coordinate covalent bond

The ability of an atom to attract the shared pair of electons towards itself in a molecule is called

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Ionization energy

Electronietativity

Shielding effect

Electron affinity

N-shell contains number of subshells.

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1

3

4

2

Which one of the following is not a greenhouse Effect?

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Increasing atmosphere temperature.

Increasing food chains

increasing flood risks

Increasing sea-level

Formula of Urea is.

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KCNO

H₂N-CO-NH₂

HN-CO₂-NH

H₃N-CO-NH₃

Which one is not the fraction of residual oil?

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Paraffin wax

Asphalt

Fuel oil

Coke

Which is not a part of flue gas?

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Furans

Dioxins

HCl

H₂SO₄

Who put forward the vital force theory?

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Berzelius

Wohler

Dalton

Lavoisier

Which gas like a glass wall of g green house:

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CO

O2

CO2

N2

Building are being damaged by acid rain because it attacks.

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Calcium sulphate

Calcium nitrate

Calcium carbonate

Calcium oxalate

Acids have taste

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Bitter

Seetish

Sour

Saltish

Which factor determines the severity of a pollutant?

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Chemical nature

concentration

Persistence

All of them

Vibrious cholera causes.

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Choleera

Dysentery

Fluorsis

Hepatitis

Concentration is a .

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Mixing technique

Separating technique

Boiling technique

cooling technique

The total number of protons and neutrons present in the nucleus of an atom is called.

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Mass number

Atomic number

Molecular mass

Relative atomic mass

Hund's rule state that when electrons enter to the same sub levels they are.

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Singly occupied with same spin

Doubly occupy with same spin

Singly occupied with different spin

Doubly occupied with different spin

The structure of water molecule is.

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angular

Linear

Trigonal

Trigonal pyramidal

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

The oxidation of O -atom in OF3 is.

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-2

+2

-1

+1

Catalyst used in preparation of NH3 from N2 and H2 is.

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Ni

Fe

Pt

V2O5

Which of the following solutions has the highest boiling point

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5.85% solution of sodium chloride

18.0% solution of glucose

6.0% solution of urea

All have the same boiling points

Along period of periodic table shielding effects.

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Increases

Decreases

Remain constant

First increases than decreases

Haemoglobin is a Macro molecule and consists of approximately atoms.

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5000

10,000

68000

15000

The mass fo 1.505 x 10²³atoms of sulphur is.

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0.5 g

0.6 g

0.7 g

0.8 g

According to classical concept, oxidation involves

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Addition of oxygen

Addition of electron

Removal of hydrogen

All are correct

A polymeric substance that is formed in the liquid state and then hardened to a right solid is called a

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Fiber

Plastic

Varnish

Polyamid resin

Co-ordination number of Cu in

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Zero

Two

Four

Six

Acetic acid form a dimer in liquid phase because.

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Low ionization constant of acid

High solubility in water

Hydrogen bonding

Greater polarity

Bakelite is obtained from phenol by reacting with

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Acetal

Ethanal

Formaldehyde

Methanol

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

On heating aldehydes with Fehling's solution we get a precipitate whose colour is

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Pink

Black

Yellow

Brick red

Which one of the following pairs of metal reactive directly with nitrogen

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Na and Mg

Li and Mg

Mg and Ca

Li and Be

A snake was preserved in a solution and was placed in biology laboratory. The solution is.

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De ionized water

Fehling solution

Formalin

Chloroform

Which hydroxide decomposes on heating.

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LiOH

NaOH

KOH

CaOH

Effect of substituent on benzene ring is due to

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Resonance

Inductive effect

Both a and b

Neither a nor b

Which one of the following elements has the same oxidation number in all its known compounds.

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Beryllium

Nitrogen

Sulphur

Chorine