untitled

Multiple Choice

Dissolved Sodium chloride can be separated from salt solution by

• Chemical process of extraction

• Physical process of evaporation

• Chemical processes

Multiple Choice

Blood and sea water are

• blood is a mixture whereas sea water is a compound

• blood is a compound and sea water is a mixture

• both mixtures

Multiple Choice

Define a pure substance?

• A pure substance consists of a single type of particles and constant composition.

• A pure substance consists of two different types of particles with variable composition

• A pure substance consists of many types of particles and different composition

Multiple Choice

In a sugar solution water is_____ and sugar is_____

• water is solute and sugar is solvent

• water solute and as well as solvent

• water is solvent and sugar is solute

Multiple Choice

What is meant by chromatography?

• The process of separation of volatile and non volatile mixtures is called chromatography.

• The process of separation of components of a mixture based on its solubility is called chromatography

• The process of separation based on its solubility is called chromatography

Multiple Choice

The method used in washing machines to squeeze out water from wet clothes

• Sublimation

• Distillation

• Centrifugation

Multiple Choice

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

• Supersaturated Solution

• Colloidal Solution

• Aqueous Solution

• Thermo Saturated Solution

Multiple Choice

A sample contains two substances and has uniform properties. The sample is ________?

• A compound.

• A heterogeneous mixture.

• An element.

• A homogeneous mixture.

Multiple Choice

A mixture will appear translucent in the case of?

• Copper sulphate + water.

• Alum + water.

• Sugar + water.

• Starch + water.

Multiple Choice

Which of the following is an example of heterogeneous substance?

• Bottled water.

• Table salt.

• Pieces of copper.

• Candle.

Multiple Choice

Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y   $\rightarrow$    P
X and Y cannot be broken down into simpler substances by simple chemical
reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compound
(iii) X and Y are elements
(iv) P has a fixed composition

• (a) (i), (ii) and (iii),

• (b) (i), (ii) and (iv)

• (c) (ii), (iii) and (iv)

• (d) (i), (iii) and (iv)

Multiple Choice

What is the solute in the soda water?

• Water

• Carbon dioxide

• Sugar

• Oxygen

Multiple Choice

how will you seperate oxygen from a mixture of liquid air?

• centrifugation

• seperating funnel

• fractional distillation

• distillation

Multiple Choice

Tyndall effect is observed in forests because of

• tress

• high oxygen level

• mist and dust particles in the air

• less sunlight

Multiple Choice

If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of

• (a) Evaporation

• (b) Precipitation

• (c) Condensation

• (d) Sublimation

Multiple Choice

Which of the following elements is not a metalloid?

• (a) Boron

• (b) Silicon

• (c) Germanium

• (d) Tungsten

Multiple Choice

Brass is an alloy. It is a mixture of______

• 30% Zinc 70% copper

• 20% copper 80% nickel

• 40% iron 80% copper

• 35% gold 65% zinc

Multiple Choice

Brass is an alloy. It is a mixture of______

• 30% Zinc 70% copper

• 20% copper 80% nickel

• 40% iron 80% copper

• 35% gold 65% zinc

Multiple Choice

Air is regarded as mixture because?

• It's pressure may vary.

• It's temperature may vary.

• Volume changes under different compositions.

• It's compositions may vary.

Multiple Choice

In which of the following constituents are present in the ratio?

• Mixture.

• Compound.

• Solution.

• Colloid.

Multiple Choice

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

• Supersaturated Solution

• Colloidal Solution

• Aqueous Solution

• Thermo Saturated Solution

Multiple Choice

Immiscible liquids separate out into layers depending on their

• Volumes

• Weights

• Masses

• Densities

Multiple Choice

_____________ was the first scientist to coin the term element in _____.

• Robert Boyle, 1683

• Antoine Lavoisier , 1661

• Robert Boyle, 1661

• Antoine Robert Lavoisier, 1743

Multiple Choice

By which process can we separate cream from milk?

• Centrifugation

• Chromatography

• Promation

• Filtration

Multiple Choice

Which method do we use to separate two miscible liquids?

• Centrifugation

• Evaporation

• Distillation

• Separating Funnel

Multiple Choice

A compound can have variable composition.

• False

• Wrong Question

• Sometimes

• True

Multiple Choice

A sample contains two substances and has uniform properties. The sample is ________?

• A compound.

• A heterogeneous mixture.

• An element.

• A homogeneous mixture.

Multiple Choice

A mixture will appear translucent in the case of?

• Copper sulphate + water.

• Alum + water.

• Sugar + water.

• Starch + water.

Multiple Choice

Which of the following is an example of heterogeneous substance?

• Bottled water.

• Table salt.

• Pieces of copper.

• Candle.

Multiple Choice

Which of the following is an example of homogeneous substance?

• Granite.

• Copper sulphate.

• m&m candy.

• Muddy water.

Multiple Choice

Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y   $\rightarrow$    P
X and Y cannot be broken down into simpler substances by simple chemical
reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compound
(iii) X and Y are elements
(iv) P has a fixed composition

• (a) (i), (ii) and (iii),

• (b) (i), (ii) and (iv)

• (c) (ii), (iii) and (iv)

• (d) (i), (iii) and (iv)

Multiple Choice

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

• (a) Composition of solute

• (b) Concentration of a solvent

• (c) Concentration of a solute

• (d) Concentration of a solution

Multiple Choice

What is the solute in the soda water?

• Water

• Carbon dioxide

• Sugar

• Oxygen

Multiple Choice

how will you seperate oxygen from a mixture of liquid air?

• centrifugation

• seperating funnel

• fractional distillation

• distillation

Multiple Choice

Tyndall effect is observed in forests because of

• tress

• high oxygen level

• mist and dust particles in the air

• less sunlight

Multiple Choice

Rusting of an article made up of iron is called

• (a) corrosion and it is a physical as well as chemical change

• (b) dissolution and it is a physical change

• (c) corrosion and it is a chemical change

• (d) dissolution and it is a chemical change

Multiple Choice

Two substances, A and B were made to react to form a third substance,
A2B according to the following reaction
2 A + B   $\rightarrow$     A2 B
Which of the following statements concerning this reaction are incorrect?
(i) The product A2B shows the properties of substances A and B
(ii) The product will always have a fixed composition
(iii) The product so formed cannot be classified as a compound
(iv) The product so formed is an element
 

• (a) (i), (ii) and (iii),

• (b) (ii), (iii) and (iv)

• (c) (i), (iii) and (iv)

• (d) (ii), (iii) and (iv)

Multiple Choice

When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:

• (a) Centrifugation

• (b) Fractional distillation

• (c) Evaporation

• (d) Tunneling

Multiple Choice

If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of

• (a) Evaporation

• (b) Precipitation

• (c) Condensation

• (d) Sublimation

Multiple Choice

Which of the following elements is not a metalloid?

• (a) Boron

• (b) Silicon

• (c) Germanium

• (d) Tungsten

Multiple Choice

Which of the following non-metal is a good conductor of electricity?

• (a) Aluminium

• (b) Silicon

• (c) Graphite

• (d) Gold

Multiple Choice

Brass is an alloy. It is a mixture of______

• 30% Zinc 70% copper

• 20% copper 80% nickel

• 40% iron 80% copper

• 35% gold 65% zinc

Multiple Choice

How will you separate the components of sugar solution

• evaporation

• crystallization

• filtration

• chromatography

Multiple Choice

Tyndall effect is observed in both suspensions and colloids.

• True

• Never

• Sometimes

• False

Multiple Choice

What is the dispersion phase and medium of milk?

• Liquid and Solid,

• Solid and Liquid

• liquid and liquid

• gas and solid

Multiple Choice

The smallest particle of a substance is......

• atom

• element

• molecule

• compound

Multiple Choice

Atomicity is ......

• the number of atoms present in an element.

• the number of atoms present in a molecule.

• atomic mass

• none of the above

Multiple Choice

The short-hand notation of an element is called....

• formula

• symbol

• mark

• representation

Multiple Choice

The bonding capacity of an element is called......

• Atomic number

• Atomic Mass Unit

• Molecular mass

• Valency

Multiple Choice

"Total mass of the products formed in chemical reaction is exactly equal to the total mass of the reactants present in it." is a .....

• Law of constant proportion

• Law of multiple proportion

• Law of conservation of mass

• All the above

Multiple Choice

"In a compound, the elements always present in the fixed ratio of their mass." is a ....

• Law of constant proportion

• Law of conservation of mass

• Law of multiple proportion

• None of the above

Multiple Choice

Father of modern chemistry is......

• Antoine Lavoisier

• Joseph L Proust

• John Dalton

• Rutherford

Multiple Choice

Who proposed Law of Conservation of mass?

• Proust

• Dalton

• Democrats

• Lavoisier

Multiple Choice

Who proposed Law of constant proportion?

• John Dalton

• Joseph L Proust

• Lavoisier

• Neil's Bohr

Multiple Choice

Who Proposed the law of multiple proportion?

• Antoine Lavoisier

• Joseph L Proust

• John Dalton

• Neil's Bohr

Multiple Choice

The Latin name of water is.....

• Oxy

• Hello

• Hydro

• none of the above

Multiple Choice

An Indian sage who postulated the atom in his VISHESIKA SUTRA was ... ...

• Maharishi Kannada

• Maharishi Kasyapa

• Maharishi Kannada and Kasyapa are same.

• None of the above

Multiple Choice

'S' is the symbol of ....

• Silicon

• Sulfur

• Sodium

• Above all

Multiple Choice

The symbol of Gold is......

• G

• Ag

• Au

• Go

Multiple Choice

The Latin name of Potassium is......

• Natrium

• Kalium

• Plum bum

• None of the above

Multiple Choice

Hydragyrum is the Latin name of ......

• Iron

• Mercury

• Tin

• Tungsten

Multiple Choice

Chemical formula of Sodium Carbonate.

• NaHCO₃

• Na₂CO₃

• NaOH

• Na₂SO₄

Multiple Choice

H₂SO₄ Is the chemical formula of......

• Hydrogen Chloride

• Sulfuric acid

• Nitric acid

• Carbonic acid

Multiple Choice

Valency of inert gas elements.

• 0

• 2

• 1

• 3

Multiple Choice

Valency of Hydrogen is......

• 1

• 2

• 3

• 4

ATOMS AND MOLECULES CLASS IX

​

LAW OF CHEMICAL COMBINATION

1. LAW OF CONSERVATION OF MASS
2. LAW OF CONSTANT PROPORTION OR DEFINITE PROPORTION

Multiple Choice

Which law states that mass can neither be created nor be destroyed and given by ______________________.

• Law of conservation.

• Law of definite, Antonie Lavoisier

• Law of conservation, Proust

• None of the above

Multiple Choice

Which law states that mass can neither be created nor be destroyed?

• LAW OF MULTIPLE PROPORTION

• LAW OF CONSERVTION OF MASS

• LAW OF CONSTANT PROPORTION

• LAW OF CONSTANT PROPORTION

Multiple Choice

Which law states that in a chemical substance the elements are always present in definite proportion by mass and given by ______________________

• Law of conservation of mass, Proust

• Law of constant proportion,Lavosier

• Law of constant proportion, Proust

• None of the above

Multiple Choice

Atoms of different substances are ___________ in all aspects i.e they possess different size, shape, mass etc.

• different

• same

• both 1 & 2

• none of the above

Multiple Choice

Atoms of the same substances are _____________________ in all aspects, i.e they possess same size, shape , mass, chemical properties etc

• Different

• Identical

• Both 1 & 2

• None of the above

Multiple Choice

The ratio of mass for oxygen and hydrogen in water will be _______.

• 1:8

• 8:1

• 1:2

• 2:1

Multiple Choice

What is mass of water?

• 3g

• 7g

• 10g

• 18g

Multiple Choice

______________ is the smallest particle that takes part in a chemical reaction.

• Molecule

• Compound

• Atoms

• Ion

Multiple Choice

Atoms of different elements combine with each other in a simple ______________ number ratio to form compound.

• Whole

• Fraction

• Natural

• None of the above

Multiple Choice

The smaller tiny particles of matter which cannot be divided further is called _______________.

• Ion

• Molecule

• Atom

• Compound

Multiple Choice

__________________ is the smallest building block of matter.

• Compound

• Atom

• Molecule

• Both 1 & 2