SCIENCE IMPORTANT QUESTIONS FOR CLASS 10th [ENGLISH]

 SCIENCE IMPORTANT QUESTIONS FOR CLASS 10TH

CHAPTER – 2

Question no. : 1


When acid reacts with metal, which gas is usually released Explain with an example. How will you check the presence of this gas ?

Question no. : 2


Why does aqueous solution of acid conduct electricity ?

Question no. : 3


Why should plaster of Paris be kept in a moisture – proof pot Explain it.

Question no. : 4


Baking soda washing soda and two – two major use tell.

Question no. : 5


Take a strip of magnesium of equal length in test tube ‘A’ and ‘B’ Add hydrochloric acid (HC in test tube ‘A’ and acetic acid (CH 3 COOH) in test tube ‘B’  . The amount and concentration of both acids are the same. Which test tube will bubble faster and why ?

Question no. : 6


When diluting the acid, why do they recommend that the acid should be mixed with water and not water with acid?

Question no. : 7


Fresh milk has a pH value of What will be the change in its pH value when yoghurt is made Explain your answer.

Question no. : 8


Why do HC , HNO 3 etc. show acidic properties in aqueous solution while solutions of compounds like alcohol and glucose do not show acidity properties ?

Question no. : 9


For the following reaction, first write the word – equation and then the balanced equation :

(a) Dilute sulfuric acid reacts with granular zinc.    

(b) Dilute hydrochloric acid reacts with magnesium strip.    

(c) Dilute sulfuric acid reacts with aluminum powder.  

Question no. : 1


Baking powder is used to make cakes. If you use baking soda to make your mother’s cake at home then – 

(a) How will this affect the taste of the cake and why ?    

(b) How can baking soda be converted into baking powder ?    

(c) What is the significance of adding tartaric acid to baking soda ?  


Question no. : 2


Dry tablets of a common base B become sticky when placed in the open air. It is a product of alkali chlor – alkali process. Identify ‘B’ What type of reaction occurs when B is reacted with an acidic oxide Write a balanced equation of chemical reaction.

Question no. : 3


Carbonate of a metal reacts with an acid to form a gas which flows into a solution to form metallic carbonate again. On the other hand a gas which is obtained at the anode at the time of electrolysis of salt solution if flowed on dry forms a compound which is used to disinfect drinking water. Identify X, Y, and Z.

Question no. : 4


The sulphate salt of an element of group two of the periodic table is a white and soft substance. It can be molded into any shape by making its pulp. If this compound is left in the air for some time it forms a solid. Which cannot be used for molding purposes. Identify this sulphate salt and explain why it behaves like this Also give equations of related reactions.

Question no. : 5


Salt ‘A’ is commonly used in making bakery products. When heated, it is converted into another salt ‘B’ which is used to remove the hardness of water itself and a gas ‘C’ is released. When this gas is flowed in lime water, it makes it milky. A, B and of the Spot.

Question no. : 6


How to differentiate baking powder and baking soda by heating ?

Question no. : 7


What do you mean by strong acids and weak acids Sort strong acid and weak acid from the following 

Hydrochloric acid citric acid formic acid sulfuric acid acetic acid and nitric acid.


Question no. : 8


What does it mean to have crystalline water in a substance Activity shows that crystalline water is present in the blue crystals of copper sulphate ?

Question no. : 9


Explain why aqueous solution of sodium chloride is neutral but aqueous solution of sodium carbonate is alkaline ?

Question no. : 10


Describe the chlor – alkali method for making sodium hydroxide Why is it called chlor – alkali reaction ?

CHAPTER-3

Question no. : 1


Write the electron point structure for sodium oxygen and magnesium.

Question no. : 2


Distinguish between metals and non-metals on the basis of chemical properties.

Question no. : 3


Name three ways to protect iron from rust.

Question no. : 4


What are amphoteric oxides Give an example of two bipolar oxides.

Question no. : 5


Give reasons 

i) Platinum gold and silver are used to make jewelery.     

ii) Sodium Potassium and Lithium are stored inside the oil.   


Question no. : 6


Copper is used to make hot water tanks but not steel. Explain the reason for this.


Question no. : 7


Name two metals which will displace hydrogen from dilute acid and two metals which cannot do so ?

Question no. : 8


You must have seen copper cleaning dirty dishes with lemon or tamarind juice. Why are these citrus substances effective in cleaning dishes ?

Question no. : 9


What is an alloy? Give an example of three alloys.

Question no. : 10


Write three properties of ionic compounds.


 Question no. : 1


A compound and aluminum are used to connect the railway lines

 (a)        Identify compound X. 

 (b)       Write the name of this reaction. 

(c)        Write the chemical equation of this reaction. 


Question no. : 2


A metal that remains in the liquid state at room temperature it is heated in the presence of sulfide and oxygen is obtained. Identify this metal and its ore and  write the chemical equation of the reaction that takes place.

Question no. : 3


You are given a hammer battery bulb wire and switch.

a)         How can you differentiate between samples of metals and non-metals using these?

(b)        Assess the usefulness of these tests for differentiation between metals and non-metals.

Question no. : 4


Explain the following 

(a)        elyuminiyaka ¼? ¿½ the activity decreases if it HNO 3 is immersed in.    

(b)        Cannot catalyze oxides of carbon sodium or magnesium.  

(c)        Sodium chloride NaCl is not a good conductor of electricity in solid state whereas it conducts electricity in dissolved state or in aqueous solution.

(d)       Metals like Na, K, Ca and Mg are never found independently in nature.

Question no. : 5


How do metals combine with oxygen to form oxides? Give the equation.

(a)        Iron with steam

(b)        Calcium and potassium with water

Question no. : 6


Explain the difference between ionic compounds and covalent compounds.

Question no. : 7


A person becomes a goldsmith in every house. He pretended to create the same shine in old and dirty gold ornaments as before. Without a doubt a woman gives him her gold  bracelets which he puts in a special solution. The bracelets start shining like new but their weight is reduced drastically. That woman is very sad and after arguing the  person has to bow down. Like a detective, can you tell us about the nature of that solution?

Question no. : 8


What is the reason that the melting point and statement of metals are high?

Question no. : 9


Write the major physical properties of metals.

Question no. : 10


A non-metallic ‘A’ which is the largest component of the atmosphere , when it is heated with hydrogen ( H 2 ) in the ratio of 1: 3 in the presence of Fe catalyst forms gas  ‘B’ When heated with oxygen it gives an oxide ‘C’ If this oxide is carried in the presence of air in water then it forms an acid ‘D’ which acts as a strong oxidizer. 

i- A, B, C, and D of the Spot. 

  ii- This non-metal is an element of which group of periodic          table ?

CHAPTER – 4


Question no. : 1


What is homologous series Examples of well explaining.

Question no. : 2


What is the reason that diamond is hard and graphite is smooth and soft While both are similar to carbon.  

Question no. : 3


What will be the point structure of the electron of carbon dioxide with the CO 2 formula ?

Question no. : 4


Draw electron point structure 

            1.          Ethanic Acid 2- 2 S 3- 2               


Question no. : 5


Carbon of two properties which the are that cause us around the carbon compounds of huge numbers appear committed to ?

Question no. : 1


Why is carbon and its compounds used as fuel?

Question no. : 2


Both diamond and graphite are made of carbon atoms, yet inequality is found in their physical properties  why?

Question no. : 3


Construct the following electron point.

(a) CH 4 (b) 2                                


Question no. : 4


What will be the electron point structure of a sulfur molecule made up of 8 atoms of sulfur?

Question no. : 5


answer the following questions.

(a) What bonds are found in carbon?       

(b) Name the upper form of carbon?       

(c) What is the valency of carbon ?       

 

CHAPTER- 5


Question no. : 1


Compare the arrangement of the elements in the Modern Periodic Table and the Periodic Table of Madleaf.

Question no. : 2


How is the electronic configuration of the elements related to the position of the elements in the modern periodic table ?

Question no. : 3


In which element 

(a) There are two shells and both are complemented by electrons.      

(b) The electron configuration is , 8, 2 .   

(c) There are total three shells and there are four electrons in the valence shell.   


Question no. : 4


(a)         Which properties of all elements of the column of boron in the periodic table are the same ?

(b)        Which property of all elements of the column of fluorine in the periodic table is the same.

Question no. : 5


Which metals are in the first ten elements in the periodic table ?

Question no. : 6


Name: –  

(a)        Three elements whose outer shells are complete. 

(b) Two elements with two electrons in their outermost shells.       


Question no. : 7


What are the limitations of Dobereiner’s classification ?

Question no. : 8


What are the limitations of Newlands’ octave principle ?

Question no. : 9


Estimate the formula of the oxide of the following elements using the periodic table of mandrel :

      K, C, Al, Si, Ba

Question no. : 10


Why do you think the noble gases are kept in a separate group ?

Question no. : 11


What criteria did Mandleaf adopt to prepare his periodic table?

Question no. : 12


Explain the shortcomings of your periodic table of mandalif.

Question no. : 1


One element is the element of group II covers a third of the periodic table makes fury be basic oxides in the presence of oxygen. 

(a)        Identify that element   

(b)        Write the electron configuration of that element.  

(c)        When this element burns in the presence of a metal, write a balanced chemical equation of the reaction occurring at that time.

Question no. : 2


What criteria did Mendeleev use to prepare his periodic table?

Question no. : 3


Mendeleev predicted some elements that were not available at that time and named two of them – eka-silicon and eka aluminum. 

(a)        Write the names of those elements who took the place of these elements.   

(b)        Write the group number and the covered number of these elements in the modern periodic table. 

(c)        Classify these elements into metals nonmetals nonmetals 

(d)       How many connective electrons are there in each of them.

Question no. : 4


The electronic configuration of an atom is 2 7.

(a)        What is the atomic number of this element

(b)        Which element would have chemical similarity with the following ?  

            N (7), F (9), P (15), Ar (18) ?  

Question no. : 5


Write the names of two elements that exhibit chemical reactivity like magnesium. 

Question no. : 6


Can the following groups of elements be classified as Dobereiner’s triad Explain with reason  

(a)         Na, Si, Cl                     (b)         Be, Mg, Ca

Atomic mass, respectively   Be-9, Na – 23, Mg – 24, Si – 28, Cl – 35 and Ca – 40

Question no. : 7


Arrange the following elements in ascending order of their atomic radii 

      (a) Li, Be, F, N

     (b) Cl, At, Br, I

Question no. : 8


Identify and write the names of the metal elements from the following elements, whose electronic configuration is given below 

      (a) 2, 8, 2 (b) 2, 8, 1 (c) 2, 8, 7 (d) 2, 1 

Question no. : 9


Element ‘A’ atomic number 19) When combined with element ‘B’ atomic number 17) , write the formula for the compound that forms. Draw an electron point diagram of that compound. Explain the nature of the bond formed.

Question no. : 10


Name the following –

(a)    Three elements with an electron in their outermost shell.

(b)     Two elements with two electrons in their outermost shells.

 (c)   Three elements whose outer shell is complete.

























Leave a Comment