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Subject: Chemistry, asked on 8/9/17

Answer the following questions-
1. Identify the element with a five electrons in the outer subshell
2.  Identified the element that would tend to lose two electrons 
3. Identify the element that would tend to gain two electrons
4. identify the group having metals nonmetals liquid as well as gas at the room temperature
5. show by chemical reaction with water that Na2O is a basic oxide and CL2O7 is an acidic oxide  

Subject: Chemistry, asked on 8/9/17

 Give reasons 
​1. O is higher electron affinity than N
2.  Electron affinity of noble gases is zero 
 

Subject: Chemistry, asked on 8/9/17

 How will you justify the presence of 18 elements in the fifth period of the periodic table.

Subject: Chemistry, asked on 8/9/17

To 15g of NaOH Is dissolved in 250 ML of a  solution.  Calculate it's molarity and normality 

Subject: Chemistry, asked on 8/9/17

Explain the hybridisation, bonding and structure of PCl5

Subject: Chemistry, asked on 8/9/17

 What is inductive effect? Given example 

Subject: Chemistry, asked on 8/9/17

Write IUPAC names for C6H5CH2CHO and (CH3)2 ----- CH(NH2)CH2CH2CH3
 

Subject: Chemistry, asked on 8/9/17

 Account for the following-
1.  Hydrogen is similar to both alkali and halogen 
2. How does H2O2 behave as a bleaching agent
3.  Draw the structure of H202  in gas phase

Subject: Chemistry, asked on 8/9/17

Predict the formula of the binary compound formed by the combination of the following pairs of elements-
1. Magnesium and nitrogen
2. Silicon and oxygen 
3.  Aluminium and chlorine       

Subject: Chemistry, asked on 8/9/17

 What causes temporary and permanent hardness of water? Explain Clarks method of removing temporary hardness of water. 

Subject: Chemistry, asked on 8/9/17

 a). Molecular formula of a compound in a homogeneous Series is C2H40. What is the molecule are formula of its next number? 
b).  State the principle of the following techniques taking an example in each case
      1. Steam distillation
      2.  Chromatography

Subject: Chemistry, asked on 8/9/17

Calculate the amount of sulphuric acid present in 200 ML of 0.1M  sulphuric acid 

Subject: Chemistry, asked on 8/9/17

 Draw resonating structure of CO3^2-

Subject: Chemistry, asked on 8/9/17

 In an excited hydrogen atom an electron undergoes a transition from n=1 to n=2.  Assuming the value of R= 1.09677*10^7 m^-1
a) The wave number of the emitted radiation. 
b)  The frequency of the emitted radiation
c)  The wavelength of the emitted radiation

Subject: Chemistry, asked on 8/9/17

 A compound contains 4.07% hydrogen, 24.25% carbon and 71.75% chlorine. It's  molar mass is 99.03 g. What is the empirical and molecular formula? 

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