| 1 |
Which of the following best describes the shape and polarity of the carbon disulphide molecule? |
Bent and polar
Linear and non-polar
Pyramidal and polar
Bent and non-polar
|
| 2 |
Total number of valence electrons in CH4 |
8
9
10
12
|
| 3 |
In which molecule. all atoms are coplanar? |
CH4
BF3
NH3
PH3
|
| 4 |
Which molecule is least ionic" |
NaCI
HCL
HF
CsF
|
| 5 |
Geometry of NH3 is |
<sup>Tetrahedral</sup>
Square planer
Pyramidal
Linear
|
| 6 |
Most reactive among the following |
Li
Mg
Ca
Na
|
| 7 |
Which of the following bonds is not present in NH4CL |
lonic bond
Covalent bond
Co-ordinate covalent bond
De-localized covalent bond
|
| 8 |
Which of the following molecules has angel of 120° |
BeCl2
BF3
CH4
NH3
|
| 9 |
The electrolyte used in fuel cell is |
КOH
NaCl(aq)
NaNO3
Molten NaCl
|
| 10 |
During space flights, astronauts ohlained water from |
Nickel cadmium cells
Lead accumulator
Fuel Cell
Alkaline battery
|
| 11 |
Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe? |
F'e is neutralized
Fe is sublimed
Fe is reduced
Fe is oxidized
|
| 12 |
Which one of the following elements is the strongest reducing agent? |
Chlorine
Sodium
Magnesium
Aluminium
|
| 13 |
Which of the following metal does not liberate hydrogen on reaction with acid? |
Mg
Pt
Zn
Ca
|
| 14 |
Stronger is the oxidizing agent, stronger is the |
emf of cell
Oxidation potential
Reduction potential
Reduction potential
|
| 15 |
During oxidation process, oxidation number of an element |
Decreases
Increases
Remains constant
Both a and b
|
| 16 |
Coinage metals Cu, Ag and Au are the least reactive because they have |
Negative reduction potential
Negative oxidation potential
Positive reduction potential
Positive oxidation potential
|
| 17 |
The standard electrode potential of hydrogen is arbitrarily taken at 298k is |
1.00volt
0.10 volt
0.00 volt
10.0 volt
|
| 18 |
In an electrochemical series, elements are arranged on the basis of |
pH scale
pKa scale
pOH scale
Hydrogen scale
|
| 19 |
In voltaic cell a saht bridge is used in order to |
Pass the electric current
Prevent the flow of ions
Mix solutions of two half cells
Allow movement of' ions between two cells
|
| 20 |
The value of oxidation number of chlorine in HCIOs is |
+7
+5
-1
+3
|
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