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Quiz 2
Mdcat-past-papers - DUHS - Chemistry Quiz
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Board: DUHS | Subject: Chemistry |
21. The boiling point of water in Kelvin scale is:
0 K
32 K
273 K
373 K
22. Which of the following is a covalent crystal?
NaCl
KI
MgBr₂
Diamond
23. The nature of attraction which holds molecular crystal is:
Ionic bond
Hydrogen bond
Covalent bond
Van Der Waals force
24. The two crystals NaNO₃ & CaCO₃ are both trigonal, they are:
Isomers
Polymorphs
Allotropes
Enantiomers
25. Cation and anion formed which combines to form crystal lattices:
Only cation is isoelectronic to nearest noble gas
Cation and anion both are isoelectronic to nearest noble gas
Cation and anion both are isoelectronic to nearest noble gas & No of electrons lost by metal and number of electrons gain by non-metal are equal
Only anion is isoelectronic to nearest noble gas
26. Radius of first orbit of hydrogen is 0.53°A. Which orbit has a radius of 4.77°A?
First
Second
third
Fourth
27. What is mass of one proton? correct representation?
Equal to 1836 electron
Equal to positron
Equal to electron
Equal to 1836 neutron
28. Which of the following has only one orientation in space and in magnetic field?
P orbital
s orbital
d orbital
f orbital
29. The Magnetic quantum number of 4f orbital would be
-2, -3, -1, 0, +2, +3, +4
-3, -2, -1, 0, +1, +2, +3
-3, -2, -1, 0, +1, +2, +3, +4
-3, -2, -1, 0, +1, +2, +3
30. CO₂ & SO₂ are two compounds. Which of the following best describes these two compounds?
Both CO₂ & SO₂ are linear and non-polar
CO₂ is angular and polar, SO₂ is linear and non-polar
CO₂ is linear and non-polar, SO₂ is angular and polar
Both CO₂ and SO₂ are angular and polar
31. What hybridization is present on carbon atoms in Ethyne (C₂H₂)?
sp3
sp²
sp
dsp³
32. Ethene has hybridization of C Atom :
dsp3
sp
sp2
d2sp³
33. Carbon atoms in ethane are hybridized:
sp
sp²
sp³
sp³d
34. The dipole moment of CO₂ is zero because it is:
Angular
Linear
Triatomic
Pyramidal
35. The equation of the first law of thermodynamics q = ΔE + W reduces at constant volume to:
ΔE = W
q = ΔE + PΔV
q = ΔE + W
q = ΔE
36. What is ΔH equal to according to the first law of thermodynamics?
ΔE – PΔV
ΔE + PΔV
–ΔE – PΔV
–ΔE + PΔV
37. The correct equation for the first law of thermodynamics is:
ΔE = q + w
ΔE = w – q
ΔE = Δq – pΔV
ΔE = Δq + pΔV
38. Reaction taking place in one step or in several steps have same ΔH. It is the statement of:
Lussac's law of combining volume
Hess's law
Boyle's law
Charles's law
39. Which of the following is true for equilibrium reaction at equilibrium?
Rate of forward reaction > backward reaction
Rate of backward = forward reaction
Rate of forward < backward reaction
Rate of backward reaction > forward reaction
40. Rate of reaction increases by the addition of a catalyst because:
Catalyst reacts with reactant
Catalyst reacts with product
Energy of activation decreases
Energy of activation increases
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