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: Fe₂O₃ + 3CO → 2Fe + 3CO₂

CO

Fe

CO₂

Fe₂O

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.Why does the colour of the solution fades?

due to its reaction with hydrogen sulphide gas and results into the formation of colourless solution of sulphuric acid.

due to its reaction with Copper sulphate gas and results into the formation of colourless solution of sulphuric acid.

Both 1 & 2

all of these

3 / 25

Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be designated as:

displacement and redox

decomposition and redox

displacement and endothermic

decomposition and exothermic.

4 / 25

The following reaction is an example of a: 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Displacement reaction

Combination reaction

Redox reaction

Neutralisation reaction

1 and 4

2 and 3

1 and 3

3 and 4

5 / 25

Which of the following are combination reactions?

KClO₃ →^(Heat)→ 2KCl + 3O₂

MgO + H₂O → Mg(OH)₂

4Al + 3O₂ → 2Al2O₃

Zn + FeSO₄ →ZnSO₄ + Fe

1 and 4

3 and 4

2 and 4

2 and 3

6 / 25

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Wash the hand with a saline solution

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

After washing with plenty of water, apply a solution of sodium hydroxide on the hand

Neutralise the acid with a strong alkali

7 / 25

Baking soda is a blend of:

Sodium carbonate and acetic acid

Sodium carbonate and tararic acid

Sodium hydrogen carbonate and tartaric acid

Sodium hydrogen carbonate and acetic acid

8 / 25

Which of the subsequent is/are true when HCl(g) is passed through water?

It does not ionise in the solution as it is a covalent compound

It ionises in the solution

It gives both hydrogen and hydroxyl ions in the solution.

It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

2 and 4

1

2

3 and 4

9 / 25

Which of the following statements is correct about an aqueous solution of an acid and a base?

The higher the pH, the stronger the acid

The higher the pH, the weaker the acid

The lower the pH, the stronger the base

The lower the pH, the weaker the base

2 and 4

1 and 3

2 and 3

1 and 4

10 / 25

Antacid are

Acidic in nature

Basic in nature

both

none

11 / 25

Where would you establish the element with electronic confguration 2, ǫ in the modern periodic table?

Group 8

Group 2

Group 18

Group 10

12 / 25

Three elements B, Si and Ge are:

Metals

Non-metals

Metalloids

Metal, non-metal and metalloid

13 / 25

Modern Periodic Law States that

Properties of elements are a periodic function of their atomic masses

Properties of elements are a periodic function of their atomic number

Properties of elements are a periodic function of their atomic size

Properties of elements are a periodic function of their Mass number

14 / 25

The atomic number of an element is 20, its valency is

2

8

16

4

15 / 25

Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be and F

F < C < O < Be < Li

F < O < C < Be < Li

Li < Be < C < O < F

Li < Be < C < F < O

16 / 25

The organic compounds having functional group are known as:

Aldehyde

Ketone

Carboxylic acids

Alcohol

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

Ethene is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

20 / 25

The molecular formula of Ethanol

C₂H₆OH

C₂H₇OH

C₂H₅OH

C₂HOOH

21 / 25

The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

X is a metal

Y is a non-metal and Z is a metal

22 / 25

Although metals form basic oxides, which of the subsequent metals form an amphoteric oxide?

Na

Ca

Al

Cu

23 / 25

Metal that can be cut by knife

mercury

sodium

Iron

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

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Li and O₂

Li₂O

Lio₂

Li₃O

LiO₃

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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