MIZORAM BOARD OF SCHOOL EDUCATION SAMPLE PAPER OF CHEMISTRY OF CLASS 10 :

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MIZORAM BOARD OF SCHOOL EDUCATION SAMPLE PAPER OF CHEMISTRY OF CLASS 10 :

The Mizoram Board of School Education, was established  to work and supervise the education system of the  School education in the state  and to localize  the  study courses and matters connected their with the state .

The Mizoram Board Of School Education , prvides the vision and mission of world-class education and faculties  in the state through leadership qualities , support, and services and teachers . The main aim is to continuously improve  education in the State of Mizoram.

The Mizoram Board of School Education  supervises the execution  and governance of  various activities that include devising of the courses of study, prescribing world class syllabus, conducting public examinations, granting affiliations to various  colleges of state and, providing direction and  support and leadership for all educational institutions under its jurisdiction area . It consists of the Chairman , General branch , Academic branch , Examination branch , Regional Office of the board etc .

The Controller of Examinations (CE) is the head of the Examination Branch and is responsible for all matters concerning examinations and administration of examinations. The CE is assisted by three officers of the branch viz., a Deputy Controller of Examinations and two Assistant Controller of Examinations and subordinate staff.

This question paper contains two sections Section A and Section B . The Section A consists of very short and short question answers and the Section B consists of the very long question answers . This sample paper is of 70 marks and the rest of which belongs to practical .

MIZORAM BOARD OF SCHOOL EDUCATION SAMPLE PAPER OF CHEMISTRY OF CLASS 10 :

SECTION – A

VERY SHORT QUESTION ANSWERS ( 10 * 1 = 10 MARKS )

1 a)define mass number ?

It is the sum of number of protons and number of neutrons present in the nucleus of an atom .

b)what is occlusion ?

Hydrogen is readily adsorbed by metals like palladium , platinum etc . This property is called occlusion .

c)define hydrogenation ?

The addition of hydrogen to organic compounds in the presence of a catalyst such as nickel , platinum , etc is called hydrogenation .

d) name two metals which liberate hydrogen from sodium hydroxide ?

Aluminium and zinc

e)what do the following symbols represent  2H and H2 ?

2H represents two atoms of hydrogen and H2 represents one molecule of hydrogen .

f)name a metal which is lighter than water ?

Sodium

g) name a metal which is good conductor of electricity ?

Carbon

h)what are the two types of cokes?

Hard coke and soft coke

i)what is hard coke?

It is a light substance having lustre and is used industrial furnaces .

j)what is chemical name of bleaching powder ?

Bleaching powder is calcium oxychloride that is CaOCl2

SHORT QUESTION ANSWERS ( 10 * 2 = 20 MARKS )

2 a) justify that respiration involves both physical and chemical changes ?

During respiration we breathe O2 and exhale out CO2. This is a chemical change .At the same time lungs  undergo expansion and contraction . this is an example of physical change .

b) what is synthesis?

It is  a reaction in which a compound is formed by the union of two elements or simple compounds . It belongs to direct combination reaction .

c) define modern periodic table ?

It is the table or chart in which various elements have been arranged in order of increasing atomic numbers in such a manner that the elements having similar properties fall in the same vertical coloumn or group .

d) ) state what is observed when ammonium chloride is heated ?

On heating ammonium chloride it sublimes and when its vapour are condensed on the cooler surface to give white sublimate .

e) give four characterstics of rusting of iron ?

The four characterstics of rusting of iron are

i)                    It is a permanent change

ii)                   It is irreversible

iii)                 New product is formed

iv)                 Energy is evolved

f) give four characterstics of digestion of food ?

Four characterstics of digestion of food are

i)                    It is a permanent change

ii)                   It is irreversible

iii)                 New product is formed

iv)                 Energy is evolved

g)what is a reactant and a product ?

Reactant : In a reaction the substances which react with each other are called reactants

Products:In a reaction , the new substances which are produced as a result of reaction are called products .

h)show that there is no change in mass in a physical change ?

Take some ice in a test tube . cork it and weight it.now heat the test tube. Ice melts to give liquid water and again weight it.the weight remains unchanged.thus during physical change there is no change in mass .

i) state some uses of slaked lime ?

Slaked lime is used in :

i)                    The manufacture of bleaching powder

ii)                   In purification of sugar and coal gas

iii)                 Used for dehairing of hides

iv)                 For softening hard water

j) define efflorescence ?

The phenomenon due to which crystalline hydrated salts lose their water of crystallisation slowly to the air at room temperature forming a powdery residue is called efflorescence .

SECTION – B

VERY LONG QUESTION ANSWERS ( 8 * 5 = 40 MARKS )

QUE 1 )give three merits and two demerits of morden periodic table ?

ANS) Merits :

i)                    It has simplified the study of elements

ii)                   It is based upon atomic number which is based upon more fundamental property of an atom

iii)                 It relates to the position of an element to its electronic configuration

Demerits :

i)                    The position of hydrogen is not certain in the periodic table

ii)                   Lanthanides and actinides don’t find a proper position in the periodic table .

iii)                 A few elements are not arranged according to their electronic configuration .

QUE 2) explain why ionic compounds are soluble in water ? explain why ionic compounds have high boiling and melting points ?

ANS )Water is a polar compound having high dielectric constant value and therefore in water the attractive forces between the oppositely charged ions are very much decreased and hence ionic compounds are soluble in water  .

Ionic compounds have high boiling and melting points beaceuse In ionic compounds there are strong electrostatic forces of attraction between the oppositely charged ions . Thus a large amount of energy is required to overcome the attractive forces

Que 3) define covalency ? write down two conditions for formation of covalent bonds ?

ANS) It is the number of electrons contributed by an atom of the element for mutual sharing during the formation of covalent bond . The two conditions for formation of covalent bonds are :

i) the combining atom should not have low ionisation energies

ii)the combining atoms should not have high electron affinities .

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QUE 4 )what is drying agents ? define dehydrating agents ?

ANS )These are the substances which can easily absorb moisture from other substances without chemically reacting with them . for example Quick lime ( CaO).

These are the substances which can remove water molecules even from compounds . example conc . sulphuric acid (H2SO4)

 

QUE 5 )state three uses of quick lime ? state two advantages of liquid carbon dioxide extinguisher ?

ANS )Quick Lime is used in

i)                    The manufacture of glass and cement

ii)                   It is used as a drying agent

iii)                 It is used as a flux during the extraction of metals

The advantages of liquid carbon dioxide are :

i)                    It can be used for electric fires.

ii)                   It can be used in case of oil fires .

QUE 6 )give one example in each case

a) a compound containing ionic bonds .

b)a compound containing a single covalent bond

c)a compound containing a double covalent bond

d)a compound containing a triple covalent bond

e)a compound containing both covalent and ionic bonds

f)a compound containing two double bonds

ANS)    a)sodium chloride ( Na+ Cl-)

b) hydrogen chloride (H-Cl)

c)oxygen molecule ( O=O)

d)nitrogen molecule(N=N)

e)sodium hydroxide Na+ ( O-H)-

f)carbon dioxide  (O=C=O)

QUE 7 ) define solubility curve ? what are the applications of solubility curves ?

ANS ) It is a curve showing the variation of solubility of solute in a given solvent with temperature. The applications are :

i) we can find the solubility of a substance at any given temperature .

ii) we can compare the solubilities of different substances at different temperatures .

iii)we can determine the effect of cooling on the hot solutions of various substances.

QUE 8 )Write the main points of Dalton’s atomic theory ?

ANS ) i) all matter is made up of large number of extremely small individual particles called atom .

ii)Atoms of the same element are alike

iii)Atoms of different elements are different

iv)Atom is a smallest unit of matter which takes part in chemical reactions .

v)Atoms cannot be changed

vi)Atoms can neither be created nor be destroyed .

 

 

 

 

 

 

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