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Subject: Science, asked on 21/1/18

What is Chemical reactivity?

Subject: Science, asked on 21/1/18

Which one is more metallic- chlorine. Or Silicon. Give reason. Plzz fast i have exams 2moro.

Subject: Science, asked on 19/1/18

Some elements show more than one valency. Plzz fast i have exams 2moro..explain .

R J
Subject: Science, asked on 19/1/18

What is credit and what is the role of credit in development of country give two axample

Subject: Science, asked on 17/1/18

what is the actual shape of electron orbitals, its not circular right ?

Subject: Science, asked on 16/1/18

Which is more electronegative Nitrogen or Phosphorus? Why?

Subject: Science, asked on 16/1/18

Please solve this question

(c) How does the valency vary in a period on going from left to right?
 
OR
 
Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why? How does metallic character of elements vary on moving from

(i) left to right in a period?

R J
Subject: Science, asked on 15/1/18


Q. An object of height 5 cm is placed perpendicular to the principal axis of concave lens of Focal length 10 cm. If the distance of the object from the optical centre of lens is 20 cm. Determine position, nature and size of image formed using lens formula. 

R J
Subject: Science, asked on 14/1/18

Q What is covalent bond? What type of bond exists in following:

CCl4 ,CaCl2,CH4, NH3

Subject: Science, asked on 14/1/18

Solve this:

 A compound X has molecular formula, C3H6. One mole of X reacts with one mole of bromine to yield a compound Y. Deduce the structures of X and Y.

Q8. (a) What prevents the entry of food into trachea while swallowing ?

       (b) Why rate of breathing is faster in aquatic animals as compared to terrestrial animals ?
 

Subject: Science, asked on 12/1/18

Why s hydrogen placed in first period

Subject: Science, asked on 11/1/18

The concept of electrons being spherical in shape is theoretical. Then all the observations like atomic radius are based on a theoretical concept. Hence, can we say that it is not entirely true ? 

Subject: Science, asked on 10/1/18

Q2:- Arrange  B, Si ,F ,N,C in their increasing order of their non metallic character

Subject: Science, asked on 10/1/18

Structure of electron dot structure of MgO

Subject: Science, asked on 10/1/18

Can anyone pleasetell how to memorize Group XIII elements of the modern periodic table {in English only}?
[[For Boron(B), Aluminium(Al), Gallium(Ga), Indium(In), Thallium(Tl) & Nihonium(Ni).]]
As early as possible!!

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