XI Chemistry Model Paper (Revised) 2021 || BIEK || Talha's Physics Academy

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1. Rain drops have spherical shape because a sphere has the least
* Area * Volume
* Length * Surface to volume ratio
2. The quantities relationship between the substances according to balance equation describes:
* Reversible reaction * Stoichiometry
* Limiting reactant * Percentage compound
3. have
* Two significant figures * Three significant figures
* Four significant figures * Five significant figures
4. The no. of orbitals in a shell can be determined by the formula
* (2l+1) * 2(2l+1)
* n
2 * 2n2
5. S
-2
(Z=16) is isoelectronic with
* 11Na+1 * 9F
-1
* 19K
+1 * 13Al+3
6. The most of the radiations coming out from pitch blend were
* Electron * Proton
* X-rays * Neutron
7. The bonds present in ethene (C2H4) molecule
* Five σbond and one bond
* Two σ bond and two bond
* Three σ bonds and two bonds
* All σ bonds
8. Which molecule has linear structure:
* CH4 * NH3
* BF3 * C2H2
9. Ice floats on top of water because its density is
* Lesser than density of water * Equal to density of water
* Greater than density of water * All of them
10. Heat absorbed by a system when its volume does not change is equal to
* Internal energy * Work done by a system
* Increase in internal energy * Change in enthalpy of system
11. Which of the following is intensive property of system?
* Density * Energy
* Volume * Entropy
12. The product of pressure and volume, PV has the dimension
* Pressure * Volume
* Energy * Temperature
13. For the reaction 2NH3 N2+ 3H2 the relationship between Kc and Kp
14. Given the equilibrium the PCl5 PCl3 + Cl2 ∆H = +ve
concentration of Cl2 at equilibrium will be increased by
* Lowering of temperature * Adding PCl3 to the mixture
* Adding PCl5 to mixture * Increasing pressure
15. Which one of the following solution is basic
* NH4Cl * NaCl
* Na2CO3 * KCl
16. The oxidation number of Cr in
* +3 * +6
* +12 * -2
17. The properties of solution which depends upon the no. of particles of solute are called
* Colligative properties * Intensive properties
* Qualitative properties * Physical properties
18. If the rate of reaction is independent of concentration of the reactant the reaction is of
* Zero order * 1st order
* 2nd order * 3rd order
19. A catalyst is a substance which increase the rate of reaction of chemical reaction,because
* It increases the temperature * It increases pressure
* It changes the rate constant * It lowers the activation energy
20. The branch of chemistry which deals with the study of reaction rates is known as
* Photochemistry * Chemical kinetics
* Thermodynamics * Electrochemistry
21. The penetration power of β-particle in air as compare to α-particle is
* 100 times * 2 time
* 1000 times * 200 times
22. A gas at zero kelvin:
* Is super cooled * freezes * liquefies * has zero volume
23. The molecular formula of vitamin C is C6H8O6, Its Emperical formula is:
* C2H3O2 * C3H4O3 * CH2O * CHO2
24. E+PV is called:
* Entropy * Enthalpy * Free Energy * Internal Energy
25. The quantum number values for 3p orbitals are:
* n=2, l=1, * n=3, l=0, * n=2, l=2, * n=3, l=1,
26. Orbitals having same energy are called:
* Hybrid orbitals
* Valence orbitals
* Degenerate orbitals
* Bonding orbitals
27. The net enthalpy change in a chemical reaction is same, whether it is brough about in two or more different ways in one or several steps. It is known as:
* Henry’s Law
* Joule’s Principle
* Hess’s Law
* Law of Conservation of energy
28. Which of the following compound does not contain hydrogen bonding
* CH4 * H2O * NH3 * HF
29. In a chemical reaction equilibrium is said to have established when:
* Concentration of Products and reactants are equal.
* Rate of Opposing reaction become equal
* Opposing reaction cease
* Rate of forward reaction is twice as compare to reverse reaction.
30. Which of the following molecules has the largest bond angle:
* H2O * NH3 * CH4 * BeCl2
31. The value of R (general gas constant) in Unit is
*
* .mole
* .mole
*
32. Bohr’s Atomic model is contradicted by:
* Planck’s Quantum Theory
* Chadwick Experiment
* Heisenberg uncertainty Principle
* Faraday’s Law
33. The ⁄ value of electron is :
34. The reaction which involves both oxidation and reduction is called:
* Addition reaction
* Redox reaction
* Elimination reaction
* Substitution reaction.
35. The rate of reaction
* Increases as the reaction proceeds
* Decreases as the reaction proceeds
* Remain the same as the reaction proceed
* May decreases or increases as the reaction proceed
36. For gaseous system, the value of Kp and Kc are same when:
* Reaction occurs at
* Reaction is endothermic
* reaction is exothermic
* No. of moles of products are equal to No. of moles of reactant.
37. Heat absorbed or released during a chemical process at constant pressure is equal to:
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