CBSE Class X – Science Chemistry Exam (Full Syllabus)

This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Chemistry

Each time random 25 questions will be displaced from the question bank of 500 + Questions
So we recommend you to retake the quiz till you have mastered all the questions

1 / 25

Identify the reducing agent in the following reactions: 2H₂O + 2F₂ → 4HF + O₂

H₂O

F₂

HF

O₂

2 / 25

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Name the type of reaction taking place.

double displacement reaction

single displacement reaction

double replacement reaction

all of these

3 / 25

State the reactions exothermic or endothermic in nature: Dilution of sulphuric acid

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

4 / 25

One of the following does not happen during a chemical reaction.

Breaking of old chemical bonds and formation of new chemical bonds

Formation of new substances with entirely diferent properties

Atoms of one element change into those of another element to form new products

A rearrangement of atoms takes place to form new products

5 / 25

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Designate the accurate observation:

The surface of metal becomes shiny.

The reaction mixture turns milky.

Odour of a pungent smelling gas is recorded.

A colourless and odourless gas is evolved

6 / 25

Identify the true representation of reaction occurring during chloralkali process.

2NaCl(l) + 2H₂O(l) → 2NaOH(l) + Cl₂(g) + H₂(g)

2NaCl(l) + 2H₂O(aq) → 2NaOH(aq) + Cl₂(g) + H₂(aq)

2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(aq) + H₂(aq)

2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(g) + H₂(g)

7 / 25

An old person complained of acute pain in stomach. Doctor gave small antacid tablet and he got immediate relief. What actually happened?

anatacids added excess acid in his stomach

anatacids neutralized the excess acid in his stomach

anatacids removed the excess acid in his stomach

none

8 / 25

Antacid are

Acidic in nature

Basic in nature

both

none

9 / 25

The chemical used in manufacture of soaps

Na₂Co₃

NaOH

NACo₄

Na₂OH

10 / 25

Common name calcium sulphate hemihydrate

lime stone

Plaster of paris

white stone

none

11 / 25

Organise the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al:

Cl > Si > Al > Mg > Na

Na > Mg > Al > Si > Cl

Na > Al > Mg > Cl > Si> Ca > Mg

Al > Na > Si

12 / 25

Arrange these elements in decreasing order of their atomic radii

Carbon Nitrogen Oxygen Fluorine

Fluroine oxygen carbon Nitrogen

Nitrogen Oxygen Carbon Fluroine

Oxygen Nitrogen Fluroine Carbon

13 / 25

Arrange these elements in increasing order of their atomic radii

Boron Lithuim Beryllium

Beryllum Lithium Boron

Lithium Beryllium Boron

Lithuim Boron Beryllium

14 / 25

Which is not true about the noble gases?

They exist in atomic form

They are non metallic in nature

Xenon is the most reactive.

They are radioactive in nature

15 / 25

The formulae of chlorides of Eka-silicon the elements predicted by Mendeleev.

GeCl

GeCl2

GeCl4

GeCl3

16 / 25

Which of the following is the molecular formula of cyclobutane?

C4H10

C4H6

C4H8

C4H4

17 / 25

The ability of an atom to form bonds with other atoms of the same element.

Carbonation

Catenation

Atom combination

Isomerism

18 / 25

A saturated hydrocarbon undergoes complete combustion and burns with

blue flame

red flame

orange flame

white flame

19 / 25

Unsaturated hydrocarbon undergoes incomplete combustion and burns with

blue fame

red fame

white fame

yellow fame

20 / 25

Molecular formula of Methane

CH₆

CH₄

CH₅

CH₃

21 / 25

Which one of the following metals does not respond with cold as well as hot water?

Na

Ca

Mg

Fe

22 / 25

The Lustrous non-metal

mercury

iodine

iron

almunium

23 / 25

The Most malleable and ductile metal

mercury

sodium

gold

silver

24 / 25

Give the formula of the stable binary compound that would be formed by the combination of following pair of elements: Mg and N₂

Mg3N2

MgN2

MgN

MgN3

25 / 25

Which metal is less reactive?

magnesium

calcium

both 1 & 2

none of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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