Question # 1

___________ is a pure substance that can be broken down.

Choose an answer

Matter

Element

Mass

Mixture

Every system in the universe tends to lower its energy to attain ________________

Choose an answer

Freedom

Flow

Stability

Nil

The modern periodic table is based on:

Choose an answer

Atomic number

Mass number

Relative mass

Nil

PCL5 is ________________ shaped.

Choose an answer

Bipyromidal

Angular

Triangular

Linear

The example of solid solute in gas solvent is

Choose an answer

butter

Sugar in water

Smoke in air

Opals

A heterogeneous mixture of different substance are called:

Choose an answer

Solution

Suspension

Colloids

Nil

Solid particles possess which one of the following motions?

Choose an answer

rotational motions

vibrational motions

translation motions

both translational and vibrational motions

Ionic compound are ________________ in water.

Choose an answer

insoluble

Soluble

Covalent

Solvent

The boiling point of H2O is:

Choose an answer

100

12

1.105

9

The isotopes of an element have different number of

Choose an answer

Electrons

Protons

Neutrons

Protons & Neutrons

There are _________ types of bonds.

Choose an answer

1

2

3

4

The process of roasting during metallurgy of copper is carried out in a special furnace called.

Choose an answer

Blast furnace

Fire furnace

Bessemer converter

Reverberatory furnace

ozone depletion (i.e O3--------------> O2 + O) occurs in:

Choose an answer

lower stratosphere

middle stratosphere

upper stratosphere

troposphere

The value of constant of ionic product of water Kw at 25 C.

Choose an answer

1.0 x 10^-4

1.0 x 10¹⁴

1.0 x 10^-4

1.0 x 10⁴

The rate of reverse reaction in the beginning.

Choose an answer

Slow

moderate

Very fast

Low

Wood contain the amount of carbon.

Choose an answer

70%

80%

60%

40%

Which is used for cleaning agent for domestic and commercial purpose?

Choose an answer

NaCl

Na₂CO₃

NaHCO₃

Na₂SiO₃

Which metal present in acid rain affect the aquatic life by clogging fish gills?

Choose an answer

Lead

Chromium

Aluminium

Mercury

Earth has natural systems.

Choose an answer

One

Two

Three

Four

Which of the following is tasteless?

Choose an answer

Starch

glucose

Fructose

Sucrose

The strong heating of coal in retoris in the absence of air is called.

Choose an answer

Fractional distillation

Sublimation

Roasting

Destructive distillation

Inland water includes.

Choose an answer

River

Lakes

Streams

All of them

More abundant isotope of an element is the one with.

Choose an answer

Even atomic number

Odd atomic number

Even mass number

Odd mass number

Solvent extraction is an equilibrium process and is controlled by.

Choose an answer

Law of mass action

The mount of solvent used

The amount of solute

Distribution law

Quantum number value for 2p sub shell are

Choose an answer

n = 2, I = 1

n = 1, l =1

n = 1, l = 0

n = 2, l = 0

Solvent extraction method is a particularly useful technique for separation when the product to be separated is.

Choose an answer

Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

In electrolysis of aqueous NaCl, Cl-ions are.

Choose an answer

Oxidized at anode

Oxidized at cathode

Reduced at cathode

Neither oxidized nor reduced

Solubility of which substance decreases by incressing temperature.

Choose an answer

NaNO3

KNO2

NaCl

Ce2(SO4)3

Salt of weak acid with strong base when dissolved in water gives.

Choose an answer

Acidic solution

Basic solution

Neutral solution

None of above

The concept of distribution of velocities among the gas molecules was given by.

Choose an answer

Clausius

Mexwell

Boltzmann

Vander waal

The bond angle in NH3 molecule is

Choose an answer

109.5^o

107.5^o

104.5^o

106^o

Isomorphic crystals show

Choose an answer

Same chemical properties

Same physical properties

Same crystalline form

Same melting point

Gases exert pressure on the walls of the container becasue the gas molecules.

Choose an answer

Collide with each other

Collide with walls of container

Have definite volume

Obey the gas laws

Total number of d-block elements are

Choose an answer

10

20

30

40

The conversion of benzene to chlorobenzene is a

Choose an answer

Addition reaction

Elimination reaction

Substitution reaction

Dehydration process

which one of the general formula of alkene

Choose an answer

CnH2n

Cn2n+2

CnH2n-2

CnH2n+1

Formation of cyanohydrin from an aldehyde in an example of.

Choose an answer

Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

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

Choose an answer

Na and Mg

Li and Mg

Mg and Ca

Li and Be

Which makes a molecule more stable.

Choose an answer

Greater localization of pi electrons

Less delocalization of pi electrons

Greeter delocalization of pi electrons

Less delocalization for pi electrons

Which sugar is called milk sugar

Choose an answer

Glucose

Fructose

Lactose

Maltose

Pulp is washed to remove lignin from it. Due to the presence of lignin in pulp paper becomes.

Choose an answer

Soft

Brittle

Acidic

Colourless

In t-butyl alcohol, the tertiary carbon is bonded

Choose an answer

Three hydrogen atoms

Two hydrogen atoms

One hydrogen atom

No hydrogen atom

Which element among the following belongs to Group IV A of the Periodic table.

Choose an answer

Barium

Iodine

Lead

Oxygen

___________ is use as a cooling medium for nuclear reactors

Choose an answer

Ne

He

Ar

Kr