Top 10 Questions in ICSE Class 10 Chemistry Exam - 2020

Check top 10 important chemistry questions and answers that will help you plan your study and revision in ICSE Class 10 Chemistry exam - 2020

By Topperlearning Expert 09th Mar, 2020 | 06:38 pm

The ICSE Class 10 Chemistry is exam is just a week away. This subject is crucial as it has the scope to score high marks and help the student to fare well in the board exams. Chemistry is a subject that has both formulae as well as theory, in order to prepare for a subject that has elements of both. It is important that the student gets enough written practice.

The ICSE Class 10 Chemistry paper will be of 80 marks and will have two sections. Section 1 of the paper is compulsory while Section 2 will have multiple optional numbers. Based on the previous papers and frequently asked questions, our academic experts have listed important questions that the students must revise before the exam.

Important Questions & Answers ICSE Class 10 Board Exam 2020 : Chemistry

Arrange the following according to the instructions given in the brackets:
a. Cs, Na, Li, K, Rb (increasing order of metallic character)
b. Mg, Cl, Na, S, Si (decreasing order of atomic size)
c. Na, K, Cl, S, Si (increasing order ionisation energy)
d. Cl, F, Br, I (increasing order of electron affinity)
Ans.
a. Li < Na < K < Rb < Cs
b. Na > Mg > Si > S > Cl
c. Na < Si < S < Cl
d. I < Br < Cl < F
Element X is a metal with a valency 2, and element Y is a non-metal with a valency 3.
a. Write an equation to show how Y forms an ion.
b. If Y is a diatomic gas, then write an equation for the direct combination of X and Y to form a compound.
Give equations for the following conversions from A to E:
Identify the cations in each of the following cases:
a. NaOH solution when added to Solution (A) gives a reddish brown precipitate
b. NH₄OH solution when added to Solution (B) gives a white ppt. which does not dissolve in excess.
c. NaOH solution when added to Solution (C) gives a white ppt. which is insoluble in excess.
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
a. Find the number of moles of hydrogen present.
b. What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (Atomic masses: H = 1, C = 12, O = 16)
c.If the number of molecules of hydrogen in the cylinder is X, then calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.
d. State the law that helped you to arrive at the above result.
State the observations at the anode and cathode during the electrolysis of
a. Fused lead bromide using graphite electrodes
b. Copper sulphate solution using copper electrodes
a. Name the solution used to react with bauxite as a first step in obtaining pure aluminium oxide in Bayer’s process.
b. Write the equation for the reaction where aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
c. Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
d. Write the equation for the reaction which occurs at the cathode during the extraction of aluminium by electrolysis.
What will you observe when
a. Platinum is added to aqua regia
b. Nitric acid is added to silver nitrate solution
c. Nitric acid is kept in a reagent bottle for a long time.
d.Ammonia is passed over heated copper oxide.
e. Concentrated sulphuric acid is exposed to air
f Copper sulphate (II) comes in contact with concentrated sulphuric acid
Identify the term or substance based on the descriptions given below:
a. Ice-like crystals formed on cooling an organic acid sufficiently.
b. Hydrocarbon containing a triple bond used for welding purposes.
c. The property by virtue of which the compound has the same molecular formula but different structural formula.
d. The compound formed where two alkyl groups are linked by a carbonyl group.
Complete the following table which relates to the homologous series of hydrocarbons.

General formula	IUPAC name of the homologous series	Characteristic bond type	IUPAC name of the first member of the series
C_nH_{2n- 2}	(A) ________	(B) ________	(C) ________
C_nH_{2n + 2}	(D)________	(E) ________	(F) ________

Review all the important answers and practice material for the ICSE Class 10 Chemistry exam 2020 below:

ICSE Class 10 Chemistry Exam 2020 - Sample Papers

ICSE Class 10 Chemistry Exam 2020 - Previous years papers

ICSE Class 10 Chemistry Exam 2020 – Most important questions

ICSE Class 10 Chemistry Exam 2020 – Revision notes

Important topics for your reference:

Top 10 Questions in Physics ICSE Class 10 Exam - 2020

7 tips for cracking the ICSE Class 10 Social Science Exam

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