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 4NH₃ + 5O₂ → 4NO + 6H₂O

O₂

NH₃

NO

H₂O

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.Write the chemical name of the black precipitate formed.

hydrogen sulphide

copper sulphide.

hydrogen sulphate

none of these

3 / 25

Mention whether it is physical or chemical changes :Curdling of milk

chemical

physical

Both 1 & 2

none of these

4 / 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

5 / 25

Which of the subsequent does show an oxidation reaction

Gain of oxygen

Loss of oxygen

Gain of hydrogen

None of the above

6 / 25

Calcium phosphate is present in tooth enamel. Its nature is:

Basic

Acidic

Neutral

Amphoteric

7 / 25

A visually challenged student, has to carryout a lab test to detect the presence of acid in a given solution. The acid-base indicator favoured by him will be:

Blue litmus

Clove oil

Red cabbage extract

Hibiscus extract

8 / 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

9 / 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

10 / 25

How many water molecules are present in plaster of paris

one third

half

4

2

11 / 25

Arrange these elements in decreasing order of their atomic radii

Lithuim Boron Berium

Berium Lithium Boron

Lithium Beium Boron

Boron Lithuim Berum

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

The valency of an element vary across a period

increases

Decreases

Remains constant

increases/decreases

14 / 25

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

GaCl₄

GaCl₂

GaCl

GaCl₃

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

From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

17 / 25

Which of the following substance produces brisk effervescence with baking soda solution?

Ethanoic acid

Table salt

Vinegar

Sunflower oil

18 / 25

The number of covalent bonds in the molecule of ethane.

4

7

3

1

19 / 25

UnSaturated hydrocarbons contains

double/triple covalent bonds

single covalent bonds

four covalent bonds

five covalent bonds

20 / 25

Molecular formula of Methane

CH₆

CH₄

CH₅

CH₃

21 / 25

The metals that float when dealt with water are:

Manganese and sodium

Manganesium and sodium

sodium and calcium

Magnesium and Calcium

22 / 25

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

AI

Au

Cu

Pt

2 and 4

1

2

1 and 3

23 / 25

Which metal can be displaced by copper from its salt solution?

Silver & zinc

Silver & mercury

Iron & silver

Iron & mercury

24 / 25

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire.

Due to high exothermic hydrogen evolved immediately catches fre

Due to low exothermic hydrogen evolved immediately catches fre

Due to high endothermic hydrogen evolved immediately catches fre

Due to low endothermic hydrogen evolved immediately catches fre

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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