Chemistry Quiz for Class 12
- Question of
The ion which has the highest magnetic moment is ______.
- Fe+3
- V+2
- Sc+3
- Cr+4
- Question of
The following compounds are paramagnetic and colored, except ______.
- ScCl3
- CuCl2
- CoCl2
- FeCl3
- Question of
In the following figure, the substance that causes the greatest movement in the indicator of the sensitive balance when put in the tube is ______.
- Mn2+
- Fe2+
- V2+
- Cr3+
- Question of
The following elements are arranged according to chemical activity Iron Copper Silver Platinum If you knew that the element scandium replaces hydrogen of water vigorously, what is its occupying place in the previous arrangement?
- Before iron
- After silver
- Between iron and copper
- After copper
- Question of
If you have two solutions, one of them contains V3+ ions and the other contains Zn2+ ions. Which of those solutions is colorless? [ V3+- Zn2+] And the scientific reason behind this is that ______ [all of its d-electrons are unpaired-all of its d-electrons are paired]
- Zn2+, all of its d-electrons are paired
- V3+ ,all of its d-electrons are unpaired
- Zn2+, all of its d-electrons are unpaired
- V3+ ,all of its d-electrons are paired
- Question of
When d-sublevel contains eight electrons, the number of half-filled orbitals equals ______.
- 2
- 1
- 3
- 4
- Question of
What is the name of the element or compound used in detecting of some industrials flaws as cracks in welded locations?
- Cobalt-60
- Vanadium pentoxide
- Copper
- Copper (II) sulphate
- Question of
An element belongs to the first transition series, it’s magnetic moment in X2O3 compound equals 3, deduce the atomic number of this element.
- 24
- 25
- 26
- 27
- Question of
Magnetic moment is ______.
- the tendency of an element to be attracted to an external magnet
- determined by the number of unpaired electrons in the 3d sublevel
- both
- none of these
- Question of
All of the transition metals are characterized by ______.
- electric conductivity
- forming colored solutions
- several oxidation states
- ability to be magnetized
- Question of
Which one of the following is non-crystalline or amorphous?
- Glass
- Diamond
- Common Salt
- Graphite
- Question of
Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is?
- 0.20
- 0.40
- 0.46
- 0.36
- Question of
NH4NC>3 is used in salt bridge because?
- The transport number of NH4+ and NO3– ions are almost equal.
- It is a good conductor of electricity.
- It is a weak electrolyte.
- It forms a jelly like material with agar-agar.
- Question of
Which among the following is a false statement?
- Molecularity of a reaction may be zero or fraction.
- Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.
- Rate of zero order reaction is independent of initial concentration of reactant.
- For a first order reaction, t1/2=0.693/K
- Question of
According to adsorption theory of catalysis, the speed of the reaction increases because?
- Adsorption lowers the activation energy of the reaction.
- Adsorption produces heat which increases the speed of the reaction.
- In the process of adsoption, the activation energy of the molecules becomes large.
- The concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.
- Question of
The electrolytic reduction technique is used in the extraction of?
- Highly electropostive elements.
- Metalloids.
- Transition metals.
- Highly electronegative elements.
- Question of
H2S is more acidic than H2O because?
- Atomic number of sulphur is higher than oxygen.
- Oxygen is more electronegative than sulphur.
- H — S bond dissociation energy is less as compared to H — O bond.
- H — O bond dissociation energy is less also compared to H — S bond.
- Question of
Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is?
- Complex forming nature.
- Low heats of hydration.
- High ionization energies.
- High heat of vaporization.
- Question of
Primary and secondary valency of Pt in [Pt(en)2Cl2] are?
- 2, 6
- 6, 4
- 4, 6
- 4, 4
- Question of
A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms react with ale. KOH and produces hydrocarbon which forms red ppt. with ammonical Cu2Cl2. ‘X’ gives an aldehyde on reaction with aq. KOH. The compound ‘X’ is?
- 1, 1-Dichloropropane
- 2, 2-Dichloropropane
- 1, 2-Dichloropropane
- 1, 3-Dichloropropane
- Question of
The product ‘Z’ is
- Benzoic acid
- Benzaldehyde
- Benzene
- Toluene
- Question of
Which among the given molecules can exhibit tautomerism?
- III only
- Both I and III
- Both I and II
- Both II and III
- Question of
The compound ‘A’ is?
- Ethane nitrile
- Propane nitrile
- Nitro methane
- Methyl isocyanate
- Question of
The IUPAC name of ‘Y’ is?
- N-methyl propan-2-amine
- N-isopropyl methanamine
- N-methyl propanamine
- Butan-2-amine
- Question of
The compounds , n-butane and isobutane are best considered as:
- Chain isomers
- Positional isomers
- Meta-mers
- Functional group isomers
- Question of
Phenol react with acetyl chloride in the presence of a bas to form:
- Ester
- Citric acid
- Alcohol
- Acid
- Question of
The color of Iodoform is:
- Yellow
- Black
- White
- Blue
- Question of
What is the name of the following benzene derivative?
- 4-Nitrobenzoic acid
- 1,3-Dibromobenzene
- 3-Chlorophenol
- 3-Bromo-5-chloronitrobenzene
- Question of
What is the name of the following benzene derivative?
- 3-Bromo-5-chloronitrobenzene
- 1,2,3 Trimenthylbenzene
- 1,3-Dibromobenzene
- 2 Ethyltoluene
- Question of
What is the IUPAC name of the following structure of a compound ?
- Pentanal
- 3-pentanone
- 1-phenyl-1-butanone
- Butanedial
