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Atomic Number of Metal ‚A‛ is 11, While Atomic Number of Metal ‚B‛ is 20. Which of Them Will Be More Reactive? Write the Chemical Reaction of Dilute Hcl with Metal ‚A‛.

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प्रश्न

Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl  with metal ‚A‛.

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उत्तर

Metal ‘A’ is more reactive than metal ‘B’. 
Atomic number of metal ‘A’ is 11, hence it is Na.

`2Na + 2HCI  → 2NaCI(aq)  + H_2 (g) `

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2018-2019 (March) Balbharati Model Question Paper Set 1

संबंधित प्रश्न

Elements in the same group show the same valency. Give scientific reason.


Write the electronic configuration of K and Ne.


The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.


An element 'M' with electronic configuration (2, 8, 2) combines separately with (NO3), (SO4)2– and (PO4)3– radicals. Write the formula of the three compounds so formed. To which group and period of the Modern Periodic Table does the element 'M' belong? Will 'M' form covalent or ionic compounds? Give reason to justify your answer.


From the following elements :

4Be; 9F; 19K; 20Ca

(i) Select the element having one electron is the outermost shell.

(ii) two elements of the same group.

Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).


Based on the group valency of elements state the formula lot the following giving justification for each :-

(i) Oxides of 1st group elements,

(ii) Halides of the elements of group 13, and

(iii) Compounds formed when an element of group 2 combines with, an element of group 16.


Name the element that has two shells, both of which are completely filled with electrons.


Use the letters only written in the Periodic Table given below to answer the questions that Follow:

  1. State the number of valence electrons in atom J.
  2. Which element shown forms ions with a single negative charge?
  3. Which metallic element is more reactive than R?
  4. Which element has its electrons arranged in four shells?

An element Z has atomic number 16. Answer the following questions on Z:

  1. State the period and group to which Z belongs.
  2. Is Z a metal or a non-metal?
  3. State the formula between Z and hydrogen.
  4. What kind of a compound is this?

How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?


State one reason for keeping fluorine and chlorine in the same of the periodic table.


 Given alongside is a part of the periodic table. As we move vertically downward from Li to fr?

Li Be
Na  
K  
Rb  
Cs  
Fr  
rA Ra 

 What happens to the size of atoms?


An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table:

(a) group 4
(b) group 14
(c) group 15
(d) group 16


Which of the following is the valence shell for the elements of second period of the modern periodic table?

(a) M shell
(b) K shell
(c) L shell
(d) N shell


The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A


Name two elements you would expect to show chemical reactions similar to calcium. What is the basis of your choice?


State the valency of the elements of periods 3 and write the formula of their oxides.


An element X belong to 4th period and 17th group, state.

no of valence electrons in it


An element X belong to 3rd periods and group II of the periodic table state: 

the number of valence electrons,


Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.

Which is more electronegative than chlorine?


An element 'X' (Atomic number – 20) burns in the presence of oxygen to form a basic oxide.
(a) Identify the element and write its electronic configuration.
(b) State its group number and period number in the Modern Periodic Table.
(c) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.


Taking into consideration the period of the elements given below, answer the following questions: 

Elements Atomic Radius (pm)
O 66
B 88
C 77
N 74
Be 111
Li 152
  1. Arrange the above elements in decreasing order of their atomic radii.
  2. State the period to which the above elements belong.
  3. Why this arrangement of elements is similar to the above period of modern periodic table?
  4. Which of the above elements have the biggest and the smallest atom?
  5. What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?

Fill in the blank 
Most electropositive elements belong to ______ group.


Explain
Size of atom changes when it loses or gain electron


What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?


The following questions refer to the Periodic Table.
Name the first and last element in period 2.


Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)


Arrange the following in order of increasing radii: 

 Mg2+, Mg, Mg


Choose the word or phrase from the bracket which correctly complete each of the following statement: 

Metals are good ................. (oxidising agents/reducing agents) because they are electron ............. (acceptors/donors). 


The elements of one short period of the periodic table are given below in order from left to right: 

Li Be B C O F Ne

Place the three elements fluorine, beryllium and nitrogen in the order of increasing electronegativity


The elements of one short period of the periodic table are given below in order from left to right: 

Li Be B C O F Ne

Which one of the above elements belongs to the halogen series?


An element belongs to the third period and Group IIIA (13) of the periodic table. State: the valency,


Moving down in the second group, number of valence electrons ______.


An element A has 2 electrons in its fourth shell. State:

is it an oxidising or reducing agent 


Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.


Name or state following with reference to the element of the first three periods of the periodic table.

A non-metal in period 2 having electronic configuration 2, 6.


Fill in the blanks from the words A to F given below.

A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative

Down a group in the Modern Periodic Table.
No. of electron shells __________; No. of valence electrons ________; Electronegativity ________ Character of elements changes from _________ to ____________.


Give a reason for the following:

A transition from metallic to non-metallic elements is seen on moving from left to right in a period of the periodic table.


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