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

Mention whether it is a physical or chemical changes: -Evaporation of petrol

physical

chemical

Both 1 & 2

none of these

2 / 25

Which of the following reactions is an endothermic reaction?

Burning of coal.

Decomposition of vegetable matter into compost

Process of respiration.

Decomposition of calcium carbonate to form quick lime and carbon dioxide

3 / 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

4 / 25

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should blend with it a solution of:

potassium nitride

potassium sulphide

potassium iodide

5 / 25

Calcium oxide reacts vigorously with water to produce slaked lime. CaO(s) + H₂O(l) → Ca(OH)₂(aq) This reaction can be classified as:

Combination reaction

Exothermic reaction

Endothermic reaction

Oxidation reaction

1 and 3

3 and 4

1, 3 and 4

1 and 2

6 / 25

The chemical formula for methonic acid

H2COH

HOOCH

HCOOH

None

7 / 25

What types of ions are formed when an acid is dissolved in water ?

H+ ions are formed

H<sub>2</sub>0 +

OH- ions

None

8 / 25

The source of citric acid is

lemon

vinegar

orange

none

9 / 25

The source of oxyalic acid is

cucumber

coriander

Potato

Tomato

10 / 25

Hydrogen is used in manufacture

of ammonia for fertilizers and as Rocket fuel.

soaps

dyes

none

11 / 25

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the identical group?

A and B

B and D

A and C

D and E

12 / 25

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

F < O < C < Be < Li

Li < Be < C < O < F

F < O < C < Be < Li

F < O < Be < C < Li

13 / 25

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following classification does the element belong?

Metal

Metalloid

Non-metal

Left-hand side element

14 / 25

Which of the subsequent set of elements is written in sequence of their increasing metallic character?

Be, Mg, Ca

Na, Li, K

Mg, Al, Si

C, O, N

15 / 25

The valency of an element vary across a period

increases

Decreases

Remains constant

increases/decreases

16 / 25

Ester is formed by the reaction between:

An acid and an alcohol

An acid and a base

A base and an alcohol

An acid and an alkene

17 / 25

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

Ethanoic acid

Table salt

Vinegar

Sunflower oil

18 / 25

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

Carbonation

Catenation

Atom combination

Isomerism

19 / 25

The compounds formed by the sharing of electron pairs between two atoms.

covalent compounds

ionic compounds

both 1 & 2

none

20 / 25

Chemical name of the compound CH₃—CH₂—CH₂—Br

1-Bromo Propane

2-Bromo Propane

3-Bromo Propane

4-Bromo Propane

21 / 25

The composition of aqua-regia is:

Dil. HCI : Conc. HNO₃ 3 : 1

Conc. HCI: Dil. HNO₃ 3 : 1

Conc. HCl: Conc. HNO₃ 3 : 1

Dil. HCl : Dil. HNO₃ 3 : 1

22 / 25

Metals are solid in nature. Which one of the Subsequent metals is found in liquid condition at room temperature?

Na

Fe

Cr

Hg

23 / 25

Shwetha took three beakers A, B and C containing zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces were added to each beaker. The solution will Become visible blue in the case of:

Beaker A

Beaker B

Beaker C

Beaker B and C

24 / 25

Name two metals having melting point less than 310 K (37°C).

gold & silver

mercury & silver

cesium (Cs) and gallium (Ga).

none of these

25 / 25

Which metal is less reactive?

calcium

sodium

both 1 & 2

none of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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