#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Three

11th Standard

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Chemistry

Time : 00:10:00 Hrs
Total Marks : 10

25 x 1 = 25
1. How many molecules of hydrogen is required to produce 4 moles of ammonia?

(a)

15 moles

(b)

20 moles

(c)

6 moles

(d)

4 moles

2. The molar mass of Na2SO4 is.....

(a)

129

(b)

142

(c)

110

(d)

70

3. Shape of an orbital is given by

(a)

Principal quantum number

(b)

Spin quantum number

(c)

Azimuthal quantum number

(d)

Magnetic quantum number

4. Assertion (A): Angular momentum of an electron in an atom is quantized
Reason (R): In an atom only those orbits are permitted in which angular momentum of the electron is natural number multiple of $\frac { h }{ 2\pi }$

(a)

Both A and R are true and R is the correct explanation of A

(b)

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

(c)

A is true but R is false

(d)

Both A and R are false

5. Consider the following statements.
(i) The region where the probability density of electron is zero, called nodal surface.
(ii) The probability of finding the electron is independent of the direction of the nucleus.
(iii) The number of radial nodes is equal to n + 1+ 1
Which of the above statements is/are correct?

(a)

(i) and (iii)

(b)

(i) and (ii)

(c)

(iii) only

(d)

(i) and (iii)

6. The number of unpaired electrons in carbon atom in the gaseous state is___________.

(a)

0

(b)

1

(c)

2

(d)

3

7. The energy of an electron of hydrogen atom in 2nd main shell is equal to________________

(a)

-13.6 eV atom-1

(b)

-6.8 eV atom-1

(c)

-0.34 eV atom-1

(d)

-3.4 eV atom-1

8. Which one of the following is the time independent Schrodinger wave equation?

(a)

$\triangle x.\triangle p\ge {h\over 4\pi}$

(b)

${\partial^2\psi\over \partial x^2}+{\partial^2\psi\over \partial y^2}+{\partial^2\psi\over \partial z^2}+{8\pi^2m\over h^2}=0$

(c)

${\partial^2\psi\over \partial x^2}+{\partial^2\psi\over \partial y^2}+{\partial^2\psi\over \partial z^2}+{8\pi^2m\over h^2}(E-V)\psi=0$

(d)

$\hat{H}\psi-E\psi=-{8\pi^2m\over h^2}$

9. Which one of the quantum number is used to calculate the angular momentum of an atom?

(a)

n

(b)

m

(c)

l

(d)

s

10. The orbital with n = 3 and l=2 is____.

(a)

3s

(b)

3p

(c)

3d

(d)

3j

11. What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

(a)

AB

(b)

AB3

(c)

A3B

(d)

3AB3

12. The element with atomic number 57 belongs to _____

(a)

s-block

(b)

p-block

(c)

d-block

(d)

f-block

13. The elements at the extreme left of periodic table has strong behaviour ______

(a)

Oxidizing

(b)

Reducing

(c)

both oxidisation and reducing

(d)

electro negative

14. Find the incorrect statement.

(a)

Smallest atom of periodic table is He

(b)

p-block elements are metals, nonmetals and metalloids

(c)

Noble gases have 8 valence electrons except He

(d)

Valence electron and valency is same for group I

15. The metal which is a liquid at room temperature is _______

(a)

Gallium

(b)

Mercury

(c)

Germanium

(d)

Tellurium

16. Match the list I with list II and select the correct answer using the code given below the list.

 List I List II A Unnilbium 1 Bohrium B Unnil hexium 2 Ronigenium C unnnunium 3 scaborgium D Unnilsepluim 4 Nobelium
(a)
 A B C D 1 2 4 3
(b)
 A B C D 3 1 4 2
(c)
 A B C D 4 3 2 1
(d)
 A B C D 4 3 1 2
17. The variation of volume V, with temperature T, keeping pressure constant is called the coefficient of thermal expansion ie $\alpha =\frac { 1 }{ V } { \left( \frac { \partial V }{ \partial T } \right) }_{ P }$ . For an ideal gas a is equal to

(a)

T

(b)

1/T

(c)

P

(d)

none of these

18. Which is true about cyclic process?

(a)

ΔU=0; ΔH=0

(b)

ΔU>0; ΔH<0

(c)

ΔH=0; ΔU<0

(d)

ΔU=0; ΔH<0

19. Which of the following does not result in an increase in the entropy?

(a)

crystallisation of sucrose from solution

(b)

rusting of iron

(c)

conversion of ice to water

(d)

Vapourisation of camphor

20. Change in Gibbs free energy is given by:

(a)

$\Delta$G=$\Delta$H + T$\Delta$S

(b)

$\Delta$G=$\Delta$H - T$\Delta$S

(c)

$\Delta$G=$\Delta$H $\times$ T$\Delta$S

(d)

None of these

21. The IUPAC name of  is

(a)

2 – Bromo -3 – methyl butanoic acid

(b)

2 - methyl - 3- bromobutanoic acid

(c)

3 - Bromo - 2 - methylbutanoic acid

(d)

3 - Bromo - 2, 3 - dimethyl propanoic acid

22. Cis – 2 – butene and trans – 2 – butene are

(a)

conformational isomers

(b)

structural isomers

(c)

configurational isomers

(d)

optical isomers

23. Which of the following can be used as the halide component for friedal - crafts reaction?

(a)

Chloro benzene

(b)

Bromo benzene

(c)

chloro ethene

(d)

isopropyl chloride

24. The treatment of ethyl formate with excess of RMgX gives

(a)

$R-\underset { \overset { || }{ O } }{ C } -R$

(b)

$R-\underset { \overset { | }{ OH } }{ CH } \quad R$

(c)

R- CHO

(d)

R- O- R

25. Ozone depletion will cause

(a)

forest fires

(b)

eutrophication

(c)

bio magnification

(d)

global warming