NCERT Solutions For Class 10 Science Chapter 9 Heredity and Evolution

NCERT Solutions For class 9 science chapter 10 Heredity and Evolution

NCERT Books Solutions For Class 10 Science Chapter 9 Heredity and Evolution

Class 10 is the first stepping stone for a student in the competitive world. With the introduction of the CBSE Board Exam for class 10 a few years back, this has become an important gateway for a student as based on the results of class 10th a student selects his future stream of Science, Commerce, or Arts.

Takshila Learning provides you with detailed and well explained NCERT Solutions for Class 10 of each chapter of each subject for NCERT Class 10. These NCERT Solutions help you to easily understand every concept so that you can score high in your CBSE Class 10 Board Exams.

Below you can find the NCERT solution for Class 10th Science. You can get a Solution for the all-important question of “Heredity and Evolution”

Questions Covered In Heredity And Evolution Class 10 NCERT Solutions

Pg No. 40

Ques 1: Give an example of a metal whichi. is a liquid at room temperature.
ii. can be easily cut with a knife.
iii. is the best conductor of heat.
iv. is a poor conductor of heat.

Ques 2: Explain the meanings of malleable and ductile.

Pg No. 46

Ques 1: : Why sodium is kept immersed in kerosene oil?

Ques 2:Write equations for the reactions of:
(i) iron with steam
(ii) calcium and potassium with water

Ques 3: Samples of four metals A, B, C and D were taken and added to the
following solution one by one. The results obtained have been tabulated as
follows.

Ques 4: Which gas is produced when dilute hydrochloric acid is added to a
reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.

Ques 5: What would you observe when zinc is added to a solution of iron (II)
sulphate? Write the chemical reaction that takes place.

Pg No. 49

Ques 1: (i) Write the electron-dot structures for sodium, oxygen and magnesium.
(ii) Show the formation of Na2O and MgO by the transfer of electrons.
(iii) What are the ions present in these compounds?

Ques 2: Why do ionic compounds have high melting points?

Pg No. 53

Ques 1:Define the following terms:
(i) Mineral
(ii) Ore
(iii) Gangue

Ques 2: Name two metals which are found in nature in the free state.

Ques 3: What chemical process is used for obtaining a metal from its oxide?

Pg No. 55

Ques 1:: Metallic oxides of zinc, magnesium and copper were heated with the
following metals.

Ques 2: Which metals do not corrode easily?

Ques 3: What are alloys?

EXERCISE

Ques 1: Which of the following pairs will give displacement reactions?
a) NaCl solution and copper metal
b) MgCl2 solution and aluminum metal
c) FeSO4 solution and silver metal
d) AgNO3 solution and copper metal.

Ques 2: Which of the following methods is suitable for preventing an iron frying
pan from rusting?
a) Applying grease
b) Applying paint
c) Applying a coating of zinc
d) all of the above.

Ques 3: An element reacts with oxygen to give a compound with a high melting
point. This compound is also soluble in water. The element is likely to be
(a) calcium
(b) carbon
(c) silicon
(d) iron

Ques 4: Food cans are coated with tin and not with zinc because
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.
(c) zinc is more reactive than tin.
(d) zinc is less reactive than tin.

Ques 5: You are given a hammer, a battery, a bulb, wires and a switch.
(a) How could you use them to distinguish between samples of metals and nonmetals?
(b) Assess the usefulness of these tests in distinguishing between metals and nonmetals.

Ques 6: What are amphoteric oxides? Give two examples of amphoteric oxides.

Ques 7: Name two metals which will displace hydrogen from dilute acids, and two
metals which will not.

Ques 8: In the electrolytic refining of a metal M, what would you take as the anode,
the cathode and the electrolyte?

Ques 9:Pratyush took sulphur powder on a spatula and heated it. He collected the
gas evolved by inverting a test tube over it, as shown in figure below.

Ques 10: State two ways to prevent the rusting of iron

Ques 11: What type of oxides are formed when non-metals combine with oxygen?

Ques 12: Give reasons
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluminum is a highly reactive metal, yet it is used to make utensils for
cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the
process of extraction.

Ques 13: You must have seen tarnished copper vessels being cleaned with lemon
or tamarind juice. Explain why these sour substances are effective in cleaning the
vessels.

Ques 14: Differentiate between metal and non-metal on the basis of their chemical
properties.

Ques 15: A man went door to door posing as a goldsmith. He promised to bring
back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of
gold bangles to him which he dipped in a particular solution. The bangles
sparkled like new but their weight was reduced drastically. The lady was upset
but after a futile argument the man beat a hasty retreat. Can you play the
detective to find out the nature of the solution he had used?

Ques 16: Give reasons why copper is used to make hot water tanks and not steel
(an alloy of iron).

 

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NCERT Solutions For Class 10 Science Chapter 9 Questions Answers

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