Question # 1

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

Reduction means

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Removal of H2

Removal of electrons

Gain of electrons

Gain of O2

In ionic bond complete ________________ of electrons occurs.

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Paring

Sharing

Transfer

None

Which one of the following is the weakest force among the atom?

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ionic force

metallic force

intermolecular force

covalent force

The earth is made up of ____________ % of aluminum.

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6

7

8

9

First energy level is denoted by:

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K

L

M

N

Mixture has _________ types.

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3

2

1

No types

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

The shape of H2O is ________________

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Angular

Linear

Triangular

All of above

Density of a gas increases, when its:

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temperature is increased

pressure is increased

volume is kept constant

none of these

Equilibrium constant value "K" is equal to:

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Kt / Kr

Ki / Kr

Kc / Qc

Qc /Kc

Which of the followings is a disaccharide?

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Glucose

Fructose

Sucrose

Starch

Who was prepared acetic acid in laboratory?

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Berzelius

Wohler

Kolbe

Dalton

Equilibrium constant has no unit when number of moles of reactants and products are:

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same

Different

Both a and b

None of these

General formula of Alkynes is.

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C₆H_2n-2

C_nH_2n+2

C₁₁H_2n-2

C_nH_2n-2

Grease stains from clothes are removed by sing.

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Ammonium nitrate

Aluminium hydroxide

Ammonium hydroxide

Aluminum chloride

Swimming pools are cleaned by the process.

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Chlorination

Hydrogenations

Saponification

None of them

Which of the following is the hardest coal?

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Pear

Lignite

Bituminous

Anthracite

____________ use for ripening of fruits.

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Ethene

Ethane

Ethyne

Propane

Which hepatitis is caused by contaminated water?

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Hepatitis A

Hepatitis B

Hepatitis C

Hepatitis D

Coal having 90% carbon contents is called.

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Peat

Lignite

anthracite

bituminous

The volume occupied by 1.4 g on N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

Bond energy depends upon

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Electronegativity

Size of atom

Bond length

All of these

Which of the following contains the same number of molecules as 9 g of water.

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2 g of hydrogen gas

14 g of nitrogen gas

32 g of oxygen gas

44 g of carbon dioxide gas

Dipole-dipole forces are present among.

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Molecules of Iodine

Atoms of Neon i gaseous state

Chloroforms' molecules

CCl4 molecules

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

Isomorphic crystals show

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Same chemical properties

Same physical properties

Same crystalline form

Same melting point

In discharge tube, properties of X-rays depend upon the nature of.

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Residual gas

Cathode plate

Anode plate

All of these

One mole of ethanol and one mole of ethane have an equal

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Masses

Number of atoms

Number of electrons

Number of molecules

The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is knnown as

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Henry's law

Hess's law

Joule's principle

Law of combustion

Which of the following molecules has a co-ordinate covalent bond

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NH₄CI

NaCI

HCI

AICI₃

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

Silver mirror test is given by

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Ethers

Ketones

Acids

Aldehydes

Which is not polymer

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Diamond

Starch

Sand

Nucleotide

Aromatic hydro carbon are the derivatives of

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Normal series of paraffins

Alkene

Benzene

Cyclohexane

SN2 mechanism involves

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1st order kinetic

2nd order kinetic

3rd order kinetic

Zero order kinetic

During pulp making, the pH of digester is maintained at.

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1-2

3-5

6-8

7-9

Lactose has same molecular formula as

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Glucose

Fructose

Ribose

Maltose

The flavor of octylacetate is

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Orange

Apricot

Banana

Jasmine

The colour of transition metal complexes is due to

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d-d transition of electrons

Paramagnetic nature of transition elements

Ionization

Loss of s -electrons

Out of all the elements of Group V-A the highest ionization energy is possessed by

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N

P

Sb

Bi

For which mechanisms, the first step involved is the same.

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E2 and E2

E2 and SN2

SN1 and E2

E1 and SN1

Which has reddish brown colour.

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silver acetylide

Copper acetylide

BaSO4

Aqueous KMnO4 solution