Introduction

Q. In hydrogen atom the de broglie wavelength of an electron in the second Bohr orbit is 1-105.8pm 2-211.6pm 3-211.6π pm 4-52.9π pm

Q.

Pick out the molecule which has zero dipole moment

1. NH₃

2. H₂O

3. BCl₃

4. SO₂

Q.

Assertion (A): Pent -1-ene and pent-2-ene are position isomers.

Reason (R): Position isomers differ in the position of functional group or a substituent.

1. A is not correct but R is correct.

2. Both A and R are correct and R is the correct explanation of A.

3. Both A and R are not correct.

4. Both A and R are correct but R is not the correct explanation of A.

Q. Why co2 is non polar molecules but h2o is polar

Q. If wavelength of the 4th line of balmer series of He+ ion is X, then calculate the wavelength of 3rd line of balmer series of Be3+ ion in terms of X?

Q. Sum of number of protons neutrons and electrons in 12g of carbon is ? 1. 1.8 2. 12.0441023rd 3.1.0841025th 4.10.841023rd

Q. What is ionisation energy and separation energy? How to find them?

Q.

An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be

1. 26

2. 30

3. 56

4. 36

Q. 1. If the de Broglie wavelength of an electron revolving in 2nd orbit of H atom is x then radius of that orbit is given by Options:, A)X/pi B)2X/pi C)X/2pi D)cannot be determined

Q. Draw the Lewis dot structures of (PO4)3-, (HPO3)2- and (H2PO2)- and mention Co-ordinate bonds wherever required.

Q. according to law of photochemical equivalence , the energy absorbed is given as (in ergs/mole)

Q.

Which of the following elements are called representative elements?

1. s block elements only

2. d block elements only

3. p block elements only

4. s and p block elements only

Q.

A gas mixture consists of $2$ moles of nitrogen and $4$ moles of xenon at temperature "t". neglecting all vibrational modes, the total internal energy of the system is

Q. 42. The circumference of the 4th Bohr orbit hydrogen atom is 5.32nm. The de Broglie wavelength for the electron is?

Q.

Calculate the enthalpy change for the following reaction
$C{H}_4\left(g\right)+2O_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(l\right)$
Given enthalpies of formation of $C{H}_4,C{O}_2\&H_{2}O$ are $-74.8KJmo{l}^{-1},-393.5KJmo{l}^{-1}$ and $-286.2KJmo{l}^{-1}$ respectively.

1. 891.1 KJ

2. -891.1 KJ

3. 890.1 KJ

4. -890.1 KJ

Q. the energy of separation of an electron in a hydrogen like atom in excited state is 3.4eV. The de broglie wavelength(in angstrom) associated with the electron is (1)0.33 (2)6.66 (3)13.31 (4)none of the

Q. 8.Compare rate of reaction with Ag+NO3- or rate of SN1 reaction

Q. 23.The CNC bond angle in CH3NCS is

Q.

Sulphide ions in alkaline solution react with solid sulphur to form polyvalent sulphide ions. The equilibrium constant for the formation of $S_2^{2-}$ and $S_3^{2-}$ from S and $S^{2-}$ ions are 1.7 and 5.3 respectively. Equilibrium constant for the formation of $S_3^{-2}$ from S is:

1. 1.33

2. 3.11

3. 4.21

4. 1.63

Q. 8 Given the following reactions involving A, B, C and D I) C + B+-------> C+ + B II) A+ + D------> No reaction III) C+ + A-----> No reaction IV) D + B-------> D+ + B The correct arrangement of A, B, C, D in order of their decreasing ability as reducing agent

Q. At 298 K, highest value of conductivity κ is of

298 K पर, चालकता κ के उच्चतम मान वाला है

1. Sodium
   
   सोडियम
2. Iron
   
   आयरन
3. Teflon
   
   टेफ्लॉन
4. Pure water
   
   शुद्ध जल

Q.

Name the lightest alkali metal.

Q. 40.Why bond order of CO+ is 3.5, explain with reason?

Q.

The symbol for element with atomic number 111 and name Unununnium is

1. UuU

2. Uun

3. Uuu

4. UUU

Q. 42. The most malleable metals (Au, Cu, Ag) have close packing of the type (a) hcp (b) ccp (c) bcc (d) not related

Q. 32 Strongest B-F bond is in 1.BF4- 2.H3N->BF3 3.BF3 4.H2N-BF2

Q. 17.De broglie wavelength associated with an electron in the 3rd orbit of He+ ion is Options:A)10angstrong B)2 angstrong. C)5 angstrong D)1 angstrong

Q.

$C_{graphite}+O_2\left(g\right)\to C{O}_2\left(g\right)$

$\Delta H=-94.05kcalmo{l}^{-1}$

$C_{diamond}+O_2\left(g\right)\to C{O}_2\left(g\right);\Delta H=-94.50kcalmo{l}^{-1}$ therefore

1. 

2. 

3. Graphite is the stabler allotrope

4. Diamond is harder than graphite

Q.

In the system $AB\left(s\right)\rightleftharpoons A\left(g\right)+B\left(g\right)$ doubling the quantity of AB (s) would -

1. increase the amount of both A & B to double their values

2. cause no change in the amounts of A and B

3. increase the amount of A to double its value

4. increase the amount B to double its value

Q. Which one of the following is not applicable to the phenomenon of adsorption ?