laboursonline – MCQs, Mock Tests | Chemistry Chemistry MCQ Question

Identify the correct statement regarding CO

1. it combines with H2O to form carbonic acid
2. it reacts with red blood cells of haemoglobin
3. it is powerful oxidizing agent
4. it is used to prepare aerated drinks

✅ Correct Answer: 2

The chief ore of A? is:

1. Na3A?F6
2. A?2O32H2O
3. A?2O3H2O
4. A?2O33H2O

✅ Correct Answer: 2

If temperature of gallium arsenide is increased then its conductivity will

1. decrease
2. increase
3. remains constant
4. first decreases then increases

✅ Correct Answer: 2

Boric acid cannot be used

1. As antiseptic in medicine
2. For washing eyes
3. In soda bottles
4. For enamel and glazes

✅ Correct Answer: 3

Which of the following will decompose to produce litharge

1. Pb2O
2. Pb3O4
3. PbO2
4. All of the above

✅ Correct Answer: 2

Which element can form tripositive ion?

1. Beryllium
2. Carbon
3. Silicon
4. Aluminium

✅ Correct Answer: 4

Which of the following is metasilicic acid?

1. H2SnO3
2. H2SiO3
3. H3AsO4
4. H3SbO4

✅ Correct Answer: 2

Coordination number of the transition element in [Pt Cl NO2 (NH3)4]2- is

1. 2
2. 6
3. 4
4. 8

✅ Correct Answer: 2

K2 (Cu(CN)4) which one is correct

1. Potassium tetra cyano cupperate
2. Co-ordination number is 2
3. Ligand is positively charged
4. Central atom is present in avionic sphere

✅ Correct Answer: 4

The oxidation number of central metal atom in [Ni(CO)4] is

1. 0
2. 2
3. 4
4. 6

✅ Correct Answer: 3

Group VIB of transition elements contains

1. Zn Cd Hg
2. Fe Ru Os
3. Cr Mo W
4. Mn Te Re

✅ Correct Answer: 3

The leements in which d or f orbitals are in the process of completion are

1. outer transition elements
2. inner transition elements
3. typical transition elements
4. transition elements

✅ Correct Answer: 4

The location of transition elements is in between

1. lanthanides & actinides
2. s and p block elements
3. chalcogens and halogens
4. d and f block elements

✅ Correct Answer: 2

The melting points and boiling points upto meddle of 3d- series

1. increases
2. decreases
3. remain same
4. no regular trend

✅ Correct Answer: 1

Pure metal

1. corrode slowly
2. corrode rapidly
3. does not corrode easily
4. none of these

✅ Correct Answer: 3

Compounds attracted by applied strong magnetic field are called

1. diamagnetic
2. paramagnetic
3. good conductor
4. ferromagnetic

✅ Correct Answer: 2

The correct electronic configuration of Cr is

1. [Ar]4s23d4
2. [Ar] 4s23d4
3. [Ar]4s03d5
4. [Ar]4s13d5

✅ Correct Answer: 4

The oxidation state of transition elements is usually

1. variable
2. constant
3. single
4. infinite

✅ Correct Answer: 1

When light is exposed to transition element then electrons jump from lower orbitals to higher orbitals in

1. orbitals of f-subshell
2. orbitals of d-subshell
3. orbitals of p-subshell
4. both a & b

✅ Correct Answer: 4

Non-stoichiometric compounds of transition elements are called

1. hydrates
2. hydrides
3. binary compounds
4. interstitial compounds

✅ Correct Answer: 4

When a compound of transition element is dissolved in a solution of salt then it produces

1. simples ions
2. complex ions
3. double salts
4. strong anions

✅ Correct Answer: 2

The specie which donates electrons to central metal atom in coordination sphere is called

1. anion
2. cation
3. Ligand is positively charged
4. acid

✅ Correct Answer: 3

The species which donate two electron pairs in a coordination compound is called

1. ligand
2. mono-dentate ligand
3. poly-dentate ligand
4. bi-dentate ligand

✅ Correct Answer: 4

Which of the following can form a chealate

1. ammine
2. oxalato
3. carbonyl
4. cyano

✅ Correct Answer: 2

The central atom along with ligands is called

1. complex ion
2. coordination sphere
3. ligand
4. complex compound

✅ Correct Answer: 2

The compound or complex ion which has a ring in its structure

1. polydentate ligand
2. chelate
3. monodentate ligand
4. hydrate

✅ Correct Answer: 2

In complex compounds the oxidation number is written in

1. English
2. Greek
3. Roman numeral
4. Hebrew

✅ Correct Answer: 3

Geometry of the complex compounds usually depends upon

1. type of ligands
2. types of hybridization in the elements of ligands
3. hybridization of central metal
4. All of above

✅ Correct Answer: 3

When the central atom of coordination compound is sp3d2 hybridization the expected geometry will be

1. tetrahedral
2. square planar
3. trigonal bipyramidal
4. octahedral

✅ Correct Answer: 4

In pig iron the concentration of C-atom is

1. 0.12 --- 0.25%
2. 2.5 --- 4.5%
3. 2.0 --- 4.0%
4. 0.25 --- 2.5%

✅ Correct Answer: 2

In the production of wrought iron Mg Si and P are removed in the form of

1. oxides
2. silicates
3. slag
4. carbonates

✅ Correct Answer: 3

With impurities like P and S the open hearth furnace is lined with.

1. SiO2
2. Fe2O3
3. FeO
4. CaO MgO

✅ Correct Answer: 4

The oxidation number in [MnO4]-2

1. 7
2. ?7
3. 6
4. ?6

✅ Correct Answer: 3

Which is sold as fertilizer

1. CaSiO3
2. Na2SiO3
3. Ca3(PO4)2
4. MnSiO3

✅ Correct Answer: 3

Any process of chemical decay of metals due to the action of surrounding medium is called

1. activation
2. enameling
3. corrosion
4. coating

✅ Correct Answer: 3

When an active metal like Al comes in contact with less active element like Cu then it produces

1. dry cell
2. galvanic cell
3. electrolytic cell
4. a and b

✅ Correct Answer: 2

Which of the following is typical transition metal?

1. Sc
2. Y
3. Cd
4. Co

✅ Correct Answer: 4

The molecular formula of toluene is

1. C7H7
2. C7H8
3. C8H8
4. C8H7

✅ Correct Answer: 2

In benzene sulphonic acid the sulphonic group is attached with benzene ring through

1. Hydrogen
2. Oxygen
3. Sulphur
4. ?OH

✅ Correct Answer: 3

Phenanthrene is a fused polycyclic compound contains ______ benzene rings

1. Two
2. Three
3. Four
4. Five

✅ Correct Answer: 2

Aniline is a derivative of benzene which contains

1. Imino group
2. Amino group
3. Amide group
4. Nitro group

✅ Correct Answer: 2

How many ? electrons are there in benzene to form delocalized electronic cloud

1. 3
2. 4
3. 6
4. 8

✅ Correct Answer: 3

Nitration of chlorobenzene gives

1. o - chloronitrobenzene
2. p - chloronitrobenzene
3. m - chloronitrobenzene
4. a & b

✅ Correct Answer: 4

When two or more different substituents are attached with a benzene ring the number 1 position in the ring is given to a high priority group. Which one of the following groups has highest - priority?

1. ?NH2
2. ?CHO
3. ?COOH
4. ?CN

✅ Correct Answer: 3

When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound?

1. Bromine
2. Chlorine
3. Fluorine
4. Iodine

✅ Correct Answer: 4

Which one of the following is not a meta directing group?

1. ?CN
2. ?OH
3. ?COOH
4. ?CHO

✅ Correct Answer: 2

Which pair of groups contains both ortho & para directing groups

1. ?OH ?RCO
2. ?NR3 ?CN
3. ?OCH3 ?CHO
4. ?N (CH3)2 -NH2

✅ Correct Answer: 4

Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in

1. The presence of Oxygen
2. The presence of Hydrogen
3. The absence of Oxygen
4. The presence of excessive Oxygen

✅ Correct Answer: 3

By which method the molecular mass of benzene was determined as 78.108?

1. Specific gravity method
2. Vapour density method
3. X-ray diffraction method
4. Distillation methos

✅ Correct Answer: 2

How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum?

1. Two
2. Three
3. Four
4. Six

✅ Correct Answer: 2

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Chemistry MCQ Question - Transition Elements