Sample Paper class 12th chemistry
Board exams are about to start and thus we have introduced set of sample paper class 12th chemistry here , although different subjects can be obtained at oureducation blog
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Total marks = 70
Question 1 to 10 is of 1 mark each.
Q.1 Write the electronic configuration of an element having atomic number 24?
Q.2 Which type of bond is formed when the atoms zero difference in electronegativity?
Q.3 What is the molar volume at 0°C and 1 bar pressure?
Q.4 What are ionic products of water?
Q.5 How will you separate a mixture of O-nitrophenol and p-nitrophenol?
Q.6 What is the general formula of alkynes?
Q.7 Name two reagent which can be used to distinguish between ethane and ethyne?
Q.8 What is the nature of the classical smog?
Q.9 Why boron is use in nuclear reaction?
Q.10 Define lattice enthalpy?
Question 11 to 20 is of 2 marks each
Q.11 Calculate the total number of angular nodes and radial nodes present in 30 orbitals?
Q.12 Define hydrogen bond. Is it weaker or stronger than the van der waals forces?
Q.13 Given: NH3(g) + 3H2(g) 2NH3(g) , ∆rH° = -92.4 KJmol-1 . What is the standard enthalpy of formation Determine the oxidation number of all the atoms in the following oxidants:KMnO4,K2Cr2O7 and KClO4.
of NH3(g) .
Q.14 What are the necessary conditions for any system to be aromatic?
Q.15 What is smog? How is classical smog is different from photochemical smog?
Q.16 What is spontaneous change? Give example?
Q.17 Why are alkali metals are not found in nature?
Q.18 What is “Acid Rain”?How is it harmful to the environment?
Q.19 Write the chemical equation for combustion reaction of a)Butane b)Toluene .
Q.20 Draw the structure of the following compounds:
a) Hexa-3-oxide b) 2-chloro-2-methylbutan-1-ol
Question 21 to 25 is of 3 marks each
Q.21 Explain why can alkali and alkaline earth metals not be obtained by reduction method?
Q.22 Define the term pesticides? Explain three categories of pesticides?
Q.23 Which out ofNH3 and NF3 has higher dipole moment and why?
Q.24 Define isomorphism. Explain position isomorphism and functional isomorphosim ?
Q.25 Describe the hybridization in case of PCl5.Why are the axial bonds longer as compared to equatorial bonds?
Question 26 to 30 is of 5 marks each
Q.26 State photo electric effect. The work function for caesium atom is 1.9 eV.
Q.27 At 473K, equlibirium constant Kcfor decomposition of phosphorus pentachloride,PCl5 is 8.3 x 10-3.If decomposition is depicted as, PCl5(g) PCl3 (g) + Cl2(g) ∆rH°= 124.0 kJ mol-1
a) Write an expression Kcfor the reaction.
b) What is the value of Kcfor the reverse reaction at the same temperature?
c) What would be the effect on Kc if (i) more PCl5 ia added (ii) pressure is increase ?
Q.28 What is the difference between molecular and empirical formula?A compound contain 4.07% hydrogen , 24.27% oxygen and 71.65% chlorine. Its molecular mass is 98.26 g . What are its empirical and molecular formulas?
Q.29 Addition of HBr to propene yields 2-bromopropane , while in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanisim?
Q.30 Define octet rule. Write its significance and limitations.
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