Class 11 PT I Question Paper 2024-25 Chemistry

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UNIT TEST 1 2024-25
Class-XIth
Subject- Chemistry
Time- 90Min. M.Marks-40
Q.1- Different proportions of oxygen in the various oxides of nitrogen
prove the law of? 1
(i) Reciprocal [ ] (ii) Multiple [ ]
(iii) Constant [ ] (iv) Conservation of Mass [ ]
Q.2- Which of the following ions contains zero unpaired electron?
1
(i) Cr+2[ ] (ii) Fe+2 [ ]
(iii) Cu+2 [ ] (iv) Zn+2 [ ]
Q.3- Vapour density of a gas is 22. What is its molecular mass?
1
(i) 44 [ ] (ii) 33 [ ]
(iii) 22 [ ] (iv) 11 [ ]
Q.4- Different lines in Ballmer series of H spectrum line in-
1
(i) Far IR [ ] (ii) IR [ ]
(iii) UV[ ] (iv) Visible [ ]
Q.5- The No. of molecules in 8906 lit. of a gas at NTP are-
1
(i) NA [ ] (ii) 2.NA [ ]
(iii) 4NA [ ] (iv) 6NA [ ]
Q.6- Which one of the following electronic configuration is not

possible? 1
(i) 2P6 [ ] (ii) 3s1 [ ]
(iii) 2b5 [ ] (iv) 4f12 [ ]

Q.7- The chloride of a metal has the formula Mcl3. The formula of its
phosphate will be. 1
(i) M2PO4 [ ] (ii) MPO4 [ ]
(iii) M3PO4 [ ] (iv) M (PO4)2 [ ]
Q.8- The orbital angular momentum of an electron is 2p-orbital is-
1
(i) h/4π [ ] (ii) h/2π [ ]

(iii) zero[ ] (iv) 2ℎ /2π [ ]
Q.9- The no. of molecules present in a drop of water, if its volume is
0.05ml, are- 1
(i) 1.66 x 1021 [ ] (ii) 1.66 x 1022 [ ]
(iii) 1.66 x 1023 [ ] (iv) 1.66 x 1024 [ ]
Q.10- Maximum no. of electrons in a subshell l=3 and n=4 is-
1
(i) 10 [ ] (ii) 12 [ ]
(iii) 14 [ ] (iv) 16 [ ]
Read the give passage and answer the questions that follows-
Orbitals are region or space where there is maximum probability of
finding electrons. Qualitatively, these orbitals can be distinguished
by their size, shape and orientation. An orbital of small size means
there is more chance of finding the electron near the nucleus.
Shape and orientation means the direction in which probability of
finding electron is maximum. Atomic orbitals can be distinguished
by quantum numbers. Each orbital is designated by three quantum

numbers n, I and mi (magnetic quantum number) which define
energy, shape and orientation but these are not sufficient to explain
spectra of multi- electrons atoms. Spin quantum number (ms)

determines the spin of electron. Spin angular momentum of
electron has two orientations relative to chosen axis which are
distinguished by spin quantum numbers m, which can take values
+1/2 and -1/2.
Q.11- How many orbitals are associated with n = 3?
1
Q.12- Describe the orbitals represented by (i) n = 2, 1= 1 (ii) n = 4,
1 = 0. 1
Q.13- How many electron are possible in an orbital? Why?
1
Q.14- What is shape of 's' and 'p' orbitals?
1

ASSERTION AND REASON QUESTIONS
In the following questions a statement of Assertion (A) followed by a
statement of Reason (R) is given. Choose the correct option out of
the choices given below each question.
a) If both Assertion & Reason are true and the reason is the correct
explanation of the assertion.
b) If both Assertion & Reason are true but the reason is not the
correct explanation of the assertion.
c) If Assertion is a true statement but Reason is false.
d) If both Assertion and Reason are false statements.
Q.15- Assertion (A): The empirical mass of ethene is half of its
molecular mass.

Reason (R): The empirical formula represents the simplest
whole number ratio of various atoms present in a compound.
1

Q.16. A: Photoelectric effect is most readily shown by cesium.
1
R: Photon have easiest access to the surface of cesium
metal.
Q.17- Write down electronic configuration of Cr+++, Br-?
1
Q.18- Define the molality? 1
Q.19- A mixture having 2 gm of H2 and 32gm. of oxygen occupies a volume of ..... at NTP. 1

Q.20- Find the quantum no. of 24e- of iron?
1
Q.21- What is Pauli’s exclusion Principle? Explain it by giving an
example? 2
Q.22- How many litres of N2 gas will be obtained by heating 3.2gm.
of ammonium nitrite at NTP? 2
Q.23- Find out the no. of gm-molecule and H atoms in 0.017gm
NH3? 3
Q.24- A golf ball has a mass of 40gm and a speed of 45m.s-1. If the speed can be measured
with in accuracy of 2%. Calculate the uncertainty in the position? 4

Q.25- Calcium carbonate reacts with aq. Hcl to gives calcium chloride and CO2. What
mass of CaCO3 is required to react completely with 25ml. of 0.75M Hcl? 4

Q.26- A- Calculate the % composition of each element in sugar?
3
B- If the density of methanol is 0.793kg L-1. What is its
volume needed for making 2.5 L of its 0.25M solution?

2

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