CBSE Class 11 Chemistry Chapter 11 p-Block MCQs
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CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (Set A)
1. Burning of amorphous boron in air forms
(B) Mixture of B2O3 and BN
(C) Only B2O3
(D) Only BN
Answer: Mixture of B2O3 and BN.
2. Potash alum’s , aqueous solution gives
(A) Two types of ions
(B) Only one type of ion
(C) Four types of ion
(D) Three types of ions
Answer: Three types of ions.
3. Solid CO2 is used as
(B) Fire extinguisher
(D) Artificial respirant
4. Solder is an alloy of
(A) Pb + Sn
(B) Pb + Sn + Zn
(C) Pb + Zn
(D) Sn + Zn
Answer: Pb + Sn.
5. BF3 is an example of Lewis acid because it behaves as
(C) Free radical
6. Producer gas is a mixture of
(A) CO + N2
(B) CO + H2
(C) N2 + CH4
(D) CO + H2 + N2
Answer: CO + H2 + N2.
7. Which is not an allotrope of carbon?
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET B)
1. Nitric oxide is
(A) Acidic towards litmus
(B) Basic towards litmus
(C) Neutral towards litmus
Answer: Neutral towards litmus.
2. Among the fluorides below, the one which does not exist is
3. H2S exhibits
(A) Oxidizing properties
(B) Reducing properties
(C) Basic properties
(D) None of these
Answer: Reducing properties.
4. HNO3 is manufactured by
(A) Ostwald’s process
(B) Haber’s process
(C) Contact’s process
(D) Fischer-Tropsch’s process
Answer: Ostwald’s process.
5. In the reaction, 2KI + H2O2 + O3 —–> 2KOH + O2 + A the compound A is:
6. Number of hydroxyl groups present in pyrosulphuric acid is
7. Mark the strongest acid
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET C)
1. Oxygen is paramagnetic. The unpaired electrons are present in
(A) Antibonding orbitals
(B) Bonding orbitals
Answer: Antibonding orbitals.
2. By warming a paste of bleaching powder with a solution of ammonia, we get
3. H3PO2 has the name and basicity respectively
(A) Phosphorous acid and two
(B) Hypophosphorous acid and two
(C) Hypophosphorous acid and one
(D) Hypophosphoric acid and three
Answer: Hypophosphorous acid and one.
4. Sulphur forms the chlorides S2Cl2 and SCl2 .16g/mol is the equivalent mass of Sulphur in SCl2 .Therefore, the equivalent mass of Sulphur in S2Cl2 is
(A) 32 g/mol
(B) 16 g/mol
(C) 64 g/mol
(D) 8 g/mol
Answer: 32 g/mol.
5. Which oxide is more acidic?
6. Which statement is not correct for nitrogen?
(A) It has a small size
(C) It is a typical non-metal
(D) d-orbitals are available for bonding
Answer: d-orbitals are available for bonding.
7. Industrial name of H2S2O7 is
(A) Pyrosulphuric acid
(B) Marshall’s acid
(D) All of these
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET D)
1. Caro’s acid is
2. Which is neutral to litmus?
3. BF3 is an example of Lewis acid because it behaves as:
(C) Free radical
4. CCl4 does not show hydrolysis but SiCl4 is readily hydrolysed because:
(A) Carbon cannot expand its octet but silicon can expand
(B) Electronegativity of carbon is higher than of silicon
(D) Carbon forms double and triple bonds but not silicon
Answer: Carbon cannot expand its octet but silicon can expand.
5. What is the number of free electrons present on each carbon atom in graphite?
6. Structure of boric acid (H3BO3) is:
7. The hybridization of boron atom in orthoboric acid is:
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET E)
1. The protective film of oxide on the surface of Al metal may be strengthened by:
2. Which of the following is only acidic in nature?
3. A metallic oxide which imparts purple colour to pottery is:
(A) Lead oxide
(B) Copper oxide
(C) Sodium oxide
(D) Manganese dioxide
Answer: Manganese dioxide.
4. Which of the following is a three dimensional silicate?
(D) None of these
5. The most abundant gas in ordinary air among the following is:
(C) Carbon dioxide
(D) Carbon monoxide
6. Boric acid on heating at 150 ͦC gives:
7. Which property is common in diamond and graphite?
(A) Electrical conductivity
(B) Relative atomic weight
(C) Crystal structure
Answer: Relative atomic weight.
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET F)
1. In which of the following the inert pair effect is most prominent?
2. Which oxide has three-dimensional structure?
3. Diamond and graphite are:
4. Which element has a limited coordination number of four?
5. In which of the following type of silicate one oxygen atom of basic tetrahedral unit is shared
(A) sheet silicate
(B) ortho silicate
(C) pyro silicate
(D) 3D silicate
Answer: pyro silicate.
6. B2H6 can be prepared by
(A) BCl3 + NaH
(B) BF3 + LiAlH4
(C) NaBH4 + I2
(D) All of these
Answer: All of these.
7. S–S bond is present in
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET G)
1. Quartz is an example of
(A) amorphous 3D silicate
(B) ring silicate
(C) crystalline 3D silicate
(D) chain silicate
Answer: crystalline 3D silicate.
2. Which of the following is thermally least stable
3. Metal which becomes passive with conc. HNO3
(D) Both (1) & (3)
Answer: Both (1) & (3).
4. Which is incorrectly given according to order indicated
(A) F2>Cl2>Br2>I2; Oxidising power
(B) HI>HBr>HCl>HF; Acidic strength
(C) F2>Cl2>Br2>I2; Bond dissociation enthalpy
(D) HF>HI>HBr>HCl; Boiling point
Answer: F2>Cl2>Br2>I2; Bond dissociation enthalpy
5. In graphite, electrons are
(A) Localised on each C-atom
(B) Localised on every third C-atom
(C) Delocalised within the layer
(D) Present in anti-bonding orbital
Answer: Delocalised within the layer.
6. Which of the following compounds may not be obtained by hydrolysis of xenon fluorides?
7. NH3 reacts with excess of Cl2 gas and gives
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET H)
1. Aqueous solution of borax
(A) Acidic in nature
(B) Alkaline in nature
(C) Requires 2 mole of acid for neutralisation
(D) (B) and (c) both are correct
Answer: (B) and (C) both are correct.
2. Thermally most stable oxyacid of Cl is
3. N2 does not show property of catenation because
(B) inter–electronic repulsion between non–bonding electrons is greater
(C) N ≡N has high bond enthalpy
(D) nitrogen has very high ionisation enthalpy.
Answer: inter–electronic repulsion between non–bonding electrons is greater.
4. Pure N2 gas is obtained form
(A) NH3 + NaNO2
(B) NH4Cl + NaNO2
(C) N2O + Cu
Answer: NH4Cl + NaNO2.
5.Ammonium compound which on heating does not give NH3 is
6. In the brown ring test, the brown colour of the ring is due to
(A) a mixture of NO and NO2
(B) nitrosoferrous sulphate
(C) ferrous nitrate
(D) ferric nitrate.
Answer: nitrosoferrous sulphate.
7. The reaction of elemental P4 in aqueous NaOH gives
(A) PH3, NaH2PO2
(B) PH3, NaPO4
(C) NaHPO4, NaPO4
(D) Na3P, Na3PO4
Answer: PH3, NaH2PO2.
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET I)
1. Phosphine, acetylene and ammonia is formed by treating water with
(A) Mg3P2, Al4C3, Li3N
(B) Ca3P2, CaC2, Mg3N2
(C) Ca3P2, CaC2, CaCN2
(D) Ca3P2, Mg2C, NH4NO3
Answer: Ca3P2, CaC2, CaCN2.
2. Which of the following oxides of group –16 has the highest boiling point?
3. XeF6 on partial hydrolysis with water produces a compound ‘X’. The same compound ‘X’ is formed when XeF6 and silica reacts with each other . The compound ‘X’ is
4. Which of the following inert gas compounds is not
5. Molecular formula of Feldspar is
6. A soft heavy metal with melting point 30C and is used in making heat sensitive thermometers, the metal is
7. Which metal is protected by a layer of its own oxide?
CBSE Class 11 Chemistry Chapter 11 p-Block MCQs (SET J)
1. Hardest substance among the following is
2. The correct formula of borax is
3. Boron compounds behave as Lewis acids because of their
(A) Covalent nature
(B) Electron deficient character
(C) Ionization property
(D) Ionic nature
Answer: Electron deficient character.
4. Melting point is highest for
5. Hybridisation of boron atom in orthoboric acid is
6. Which of the following is not possible due to back bonding.
(A) State of hybridization may change
(B) Bond order increases
(C) Bond angle always increases
(D) Lewis acidic strength decreases
Answer: Bond angle always increases.
7. The number of P–OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid (H4P2O7) respectively are
(A) Five and four
(B) Four and five
(C) Four and four
(D) Five and five
Answer: Four and five.
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