Question # 1

Acids means

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Bitter

Salty

Sweet

Sour

The branch of chemistry that focuses on the study of polymers, their types properties, uses is called.

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Industrial chemistry

Polymer chemistry

Organic chemistry

Astrochemistry

Whof the following represent sand?

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NaCl

CaCO3

H2O

CH2O

The enthalpy of reaction H2+I2--- 2HI

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-571.6 k J

+53.8 kJ

11 kJ

-393.5 kJ

How many elements are present in 7th period.

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2

8

18

23

Macroscopic propertues are properties that can be visualized by

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Telescope

The naked eye

Microscope

Electron microscope

When the rate of the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixgure remains consant. It is called.

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Chemical Equilibrium

Static equilirbirum

Both a and b

None of the above

How many atoms are present in one gram of H2O?

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1002 x 10²³ atom

6.022 x 10²³atom

0.334 x 10²³atom

2.004 x 10²³atom

The fore of attraction betwene water molecule is.

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Ionic bonding

Covalent bonding

Hydrgen Bonding

Co ordinate Covalent bonding

Transition elements are

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All gases

All non metals

All Metals

All metalloids

What conditon Should be met for the reversible reactio to achieve the state of equilibrium.

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The concentratio of all the reactants and the prodduct should become constant

all the reactants should be converted into the product

50% of the reactant shuld be converted into prodcuts.

One of the product should be removed from the reaction mixture.

Earth has natural systems.

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One

Two

Three

Four

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

Global warming is because of.

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Absorption of infrared radiation emitted by earth surface.

Absorption of infrared radiation coming from sun.

Absorption of infrared Ultraviolet coming from the sun.

Emission of ultraviolet radiation from the earth's surface.

When NaHCO₃ is heated it forms.

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CO₂

Ca(OH)₂

CaCO₃

CaO

Which gas acts as a glass wall of a green house?

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Oxygen

Carbon dioxides

sulphur dioxide

Hydrogen

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

Bronsted and Lowry presented their theories of acids and bases in

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1785

1787

1923

1925

Which gas like a glass wall of g green house:

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CO

O2

CO2

N2

Which salt is used for the manufacture of detergents, pulp and paper?

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NaCl

Na₂CO₃

Na₂SiO₃

NaCl

Reactions which have comparable amounts of reactants and products at equilibrium state have:

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very small Kc value

Very large Kc value

Moderate Kc value

None of these

Almost all aircrafts fly in:

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troposphere

mesosphere

stratosphere

themosphere

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

Calcium has isotopes

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7

9

1

6

If the electron in a hydrogen atom drops from n = 6 to n =4 level, the radiation emitted is in which series of lines in the spectrum of atomic hydrogen.

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Lyman

Balmer

Paschen

Brackett

Oxidation number of phosphorus in the compound is.

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+3

+4

+5

+6

When fast neutron carries nuclear reaction with nitrogen it ejects aprticles.

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Alpha

Gamma

Beta

Nil

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

The difference of potential of two electrodes when concentration of solution is 1 M each at 25^oC and 1 atmosphere is called.

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Electrode potential

Standard cell potential

Cell reaction

Cell voltage

The gain of electron is known as.

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Oxidation

Reduction

Dehydration

Dehydrogenation

Spontaneous processes are mostly

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Reversible

Irreversible

Not irreversible

None of these

A solution will be unsaturated if

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Ionic product = Kap

Ionic product < Ksp

Ionic Product > Ksp

both 'a' and 'b' are correct

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

In which substance silicon is not present.

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Talc

Asbestos

Dolomite

Zirocon

Which one of the following is not amino acid.

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Alanine

Glycine

Aspartic acid

Aniline

The word paper is derived from the name of which reed plant.

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Rose

Sun flower

Papyrus

Water Hyacinth

Which amino acid is present in cheese

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Glycine

Alanine

Tyrosine

Valine

Synthetic rubber is made by polymerization of.

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Chloroform

Acetylene

Divinylactylene

Chloroprene

The state of hybridization in ethene molecule is

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dsp²

sp³

sp²

sp

The number of possible isomers of xylene are

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2

3

4

5

In modern periodic table VI period contains elements

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8

18

10

32

Main source of aromatic compound is

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Petroleum

Coaltar

Living organisms

Dead marine animals

Silver mirror test is given by

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Ethers

Ketones

Acids

Aldehydes

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms.

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One

Two

Three

Four