Question

please its very urgent
o1. What is the difference between molarity and molality?

2. States Hund’s Rule.

3. Write the electronic configuration of Cu (Atomic no. =29)

4. Why water has maximum density at 277 k?

5. On the basis of VSEPR Theory predict the shapes of the following

molecule (a) PF5 (ii) SiF4

6. Why vegetables are cooked with difficulty at a hill station?

7. What is the effect of temperature on ionic product of water and

why?
8. Write the conjugate bases for the following acids: HF, H2SO4.

Assertion and Reason Type Questions

In the following questions, a statement of Assertion (A) followed by a

statement of Reason (R) is given. Choose the correct answer out of

the following choices:

(a) Both Assertion and Reason are true and the Reason is the correct

explanation of Assertion.

(b) Both Assertion and Reason are true and the Reason is not the

correct explanation of Assertion.

(c) Assertion is not true but the Reason is true.

(d) Both Assertion and Reason are false.

9. Assertion: HNO2 act as both, as an oxidizing agent as well as reducing

agent

Reason: The oxidation number of N can increase above +3 and can

decrease below +3

10. Assertion: F2 does not undergo disproportionation reactions.

Reason: Fluorine shows only 0 and -1 oxidation state.

SECTION B

11. Why are atoms with half filled and fully filled orbital extremely

stable?

12. The electron energy in hydrogen atom is given by

En = (-2.18 x 10-18)/n2

J. Calculate the energy required to remove the

electron completely from n = 2 orbit?

13. Explain why Cations are smaller and anions are larger than the

parent atom?

14. State Hess’s Law. What is the basis of Hess’s Law?

15. When ΔH>0 and ΔS<0, reaction is never spontaneous. Explain.

equilibrium constant expression
16. An acid having pH = 6 is diluted 1000 times. What will be the pH of

the final solution.

17. Describe the hybridization in case of ethyne.

SECTION C

18. Draw the molecular orbital diagram of O2. Calculate its Bond order

and comment on its magnetic behavior.

19. For the reaction at 298 k, 2A + B ------→ C, ΔH = 400Kj mol-1



and ΔS = 0.2 KJ K-1 mol-1

.

At what temperature will the reaction become spontaneous

considering ΔH and ΔS to be constant over the temperature range.

20. A sample of HI is placed in a flask at a pressure of 0.2 atm. AT

equilibrium the partial pressure of HI(g) is 0.04 atm. What is Kp for the

reaction.

21. Balance the following redox reaction in basic medium by any

method: MnO4

-

+ I-

---------→ MnO2 + I2

Section D

22. In the modern periodic table, elements are arranged in order of

their increasing atomic number which is related to electronic

configuration. Depending on the type of orbital receiving last electron ,

the elements in the periodic table have been divided into 4 bolcks s, p,

d, f. The modern periodic table consist of 7 periods and 18 groups. Each

period began with the filling of new energy shell. In accordance with

aufbau principle the seven periods have 2, 8,8,18,18,32 and 32

elements. To avoid the periodic table too long, two series of f block

elements, are placed at the bottom of periodic table

(i) The element with atomic no. 52 belongs to

(a) s block (b) p block (c) d block (f) f block

(ii) The elements with atomic no. 35, 53 and 85 are all
(a) noble gases (b) halogens (c) heavy metals (d) light metals

(iii) The electronic configuration of the element which is just above the

element with atomic no. 43 in the same group is….

(a) Is2 2s2 2p6 3s2 3p6 3d5 4s2

(b) Is2 2s2 2p6 3s2 3p6 3d5 4s34p6

(c) Is2 2s2 2p6 3s2 3p6 3d6 4s2

(d) Is2 2s2 2p6 3s2 3p6 3d7 4s2

(iv) Which of the elements whose atomic no. are given below cannot

be accommodated in the present set up of long form of periodic table

Section E

23. (a) If the density of methanol is 0.793 kg L-1

, What is it volume

needed for making 2.5 L of its 0.25 M solution?

(b) Calculate the number of atoms in each of the following:

(i) 52 moles of He (ii) 52 u of He (iii) 52 g of He

24.(a) Pressure of 1 g of ideal gas A at 270C is found to be 2 bar. When

2g of another ideal gas B is introduced in the same flask at same

temperature pressure becomes 3 bar. Find the relationship between

their molecular masses.

(b) Explain the significance of vander waal’s parameter?​

Answer 1

what is difference between molarity and molality ?

ANSWER :- in the photo