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Quiz 223
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4441. Correct arrangement of orbital according to size of hybridized orbitals?
sp3sp2sp3
sp3sp2sp3
sp2sp2sp3
sp3sp2sp3
4442. Consider the equation H1+O1→H2O, what volume of hydrogen gas is required to produce 1 mol of water at standard temperature & pressure?
11.2 dm3
22.4 dm3
10 dm3
58 dm3
4443. A chemical reaction has a theoretical yield of 25 g, but only 20 g of product was obtained. What is the percentage yield of the reaction?
20%
25%
45%
80%
4444. Which of the following situations most clearly demonstrates a key characteristic of a Redox reaction?
Water boiling to steam
Hydrogen gas reacting with chlorine to form hydrogen chloride gas
Sodium chloride dissolving in water
Ethanol evaporating at room temperature
4445. If 100 KJ of heat is absorbed by the system and 40 KJ of water is done on the system what is the change of internal energy?
-60 KJ
+60 KJ
-140 KJ
+140 KJ
4446. Number of unpaired electrons present in the ground state of Fe3+ are (Atomic number of Fe=26).
Three
Four
Five
Six
4447. If % yield and actual yield is 80 and 20g respectively, what will be theoretical yield?
20g
25g
30g
40g
4448. Which of the following best identifies the redox reaction:
transfer of proton
transfer of electron
absorption of light
exchange of ions
4449. Methanol is produced by reduction of :
Formaldehyde
Acetaldehyde
Propanal
Propanoe
4450. IUPAC name of (CH3)3CCH2Br is :
1-bromopentane
1-bromo-2,2,2-trimethylethane
1-bromo-2,2-dimethylpropane
2-bromopentane
4451. Which one shows anisotropic behavior?
Wood
Gemstone
Coke
Graphite
4452. In a unit cell of a crystal lattice the angle β is between faces:
a and b
b and c
c and a
not specified
4453. Pick the crystalline solid:
Cement
Ceramics
Concrete
Copper
4454. Number of unpaired electrons in Boron in ground state is/are:
1
2
3
4
4455. Chlorination of benzene in the presence of iron (III) chloride involves mechanism of:
Electrophilic addition
Electrophilic Substitution
Free radical Substitution
Free radical halogenation
4456. The element with smallest value of ionization energy is:
Li
Al
Ca
Ba
4457. Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces:
Carbonates
Alkane
Ester
Amide
4458. If P is the momentum of an object and m is its mass, then its kinetic energy is:
P/2m
P²/2m
1/2 Pm²
1/2 P²m
4459. The electric field at a point due to two equal and opposite charges is 100 N/C. If the magnitude of each charge is doubled then the electric field at that point becomes:
50 N/C
100 N/C
200 N/C
400 N/C
4460. If a plastic sheet of relative permittivity 2.5 is inserted between two-point charges placed in vacuum then the electrostatic force between them
Increased by a factor of 2.5
Decreases by a factor of 2.5
Increases by a factor of 5
Decreases by a factor of 5
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