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Hassan
1.If absolute temperature of the gas is doubled and the pressure is reduced to one half the volume the gas will.
A. Remains uncharged
B. Increase four time
C. Reduce to 1/4
D. Remains uncharged
2.The diffusion of gases at absolute zero will be
A. Unchanged
B. Zero
C. slightly decreases
D. Unchanged
3.NaCI is face centered cubic structure. The Na ion at the face of the unit cell is shared by
A. 2-unit cells
B. 4-unit cells
C. Only one unit cell
D. 2-unit cells
4.Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization
A. Chlorine
B. Argon
C. Phosphorus
D. Chlorine
5.The boiling point of water at Murree Hills.
A. 90oC
B. 98oC
C. 100oC
D. 90oC
6.Which one of the following inter molecular forces are present in neon gas molecules.
A. Hydrogen bond
B. dipole -Dipole attraction
C. London dispersion force
D. Hydrogen bond
7.In which , case particles are separated from each other.
A. Fusion
B. Condensation
C. Neutralizations
D. Fusion
8.When water freezes at 0°C, its density decreases due to
A. Cubic structure of ice
B. Empty spaces present in the structure of ice
C. Change of bond lengths
D. Cubic structure of ice
9.Existence of an element in more than one crystalline form is known as.
A. Anisotropy
B. Allotropy
C. Isomorphism
D. Anisotropy
10.The polarizabilities of elements mostly increase down the group due to the reason that
A. The atomic numbers increase
B. Number of protons increase
C. Number of shells increase along, with increase of shielding effect
D. The atomic numbers increase
11.Polymorphic substances have
A. Same physical and chemical properties
B. Different physical and chemical properties.
C. Same physical but different chemical properties
D. Same physical and chemical properties
12.Which of the following can form H-bonds
A. NH3
B. C2H6
C. NaCI
D. NH3
13.The mass of one mole of electron is:
A. 1.008 mg
B. 0.184 mg
C. 0.54 mg
D. 1.008 mg
14.27 g of Al will react with how much mass of O2 to produce Al2O3:
A. 8 g of oxygen
B. 16 g of oxygen
C. 32 g of oxygen
D. 8 g of oxygen
15.The number of moles of NO2 which contains 16 g of oxygen:
A. 0.25
B. 0.5
C. 1
D. 0.25
16.The volume occupied by 2.0 g of Ne at STP:
A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 2.24 dm3
17.A sample in the ionization chamber of mass spectrometer is ionized by:
A. Electrons
B. Proton
C. Neutron
D. Electrons
18.Which one of the following pair is not iso-electronic:
A. CO, N2
B. Na+, Ne
C. Ca, Ar
D. CO, N2
19.Which one of the following is not a molecular ion:
A. N+2
B. CH+4
C. C6H+8
D. N+2
20.180 g of glucose contains number of hydrogen atoms:
A. 3.6 x 1023
B. 6.0 x 1023
C. 7.2 x 1023
D. 3.6 x 1023
21.Who first of all determined atomic masses of elements:
A. J. Berzelius
B. J.J. Thomson
C. Johon Dalton
D. J. Berzelius
22.The mass of H-atom is 1.008 a.m.u. Its mass in kg should be:
A. 1.008 x 1.661 x 10 -23 kg
B. 1.008 1.661 x 10-27 kg
C. 1.008 x 1.661 x 10-27 kg
D. 1.008 x 1.661 x 10 -23 kg
23.The atomicity of one molecule of Haemoglobin is:
A. 10,000
B. 68,000
C. 17,000
D. 10,000
24.Formation of uninegative ion is:
A. Exothermic
B. Endothermic
C. Both A & B
D. Exothermic
25.Which of the following elements has nine isotopes:
A. Ca
B. Pd
C. Cd
D. Ca
26.Which of the following will form single peak in mass spectrograph:
A. Iodine
B. Arsenic
C. Fluorine
D. Iodine
27.Which one of the following contains maximum no. of molecules:
A. 16.0 g of CH4
B. 16.0 g of O2
C. 16.0 g of SO2
D. 16.0 g of CH4
28.Atoms of all the elements always contain in nucleus:
A. Proton
B. Proton and neutron
C. Neutron
D. Proton
29.Actual yield of a chemical reaction is always less than theoretical yield because:
A. Side reactions
B. Wastage of products
C. Reversible reactions
D. Side reactions
30.Mass of sodium in 53 g of Na2CO3 is:
A. 23 g
B. 46 g
C. 92 g
D. 23 g
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