Standard Books Chemistry Class 11 Questions

A reaction is said to be in equilibrium when

The nucleus of helium contains

The number of chain isomers possible for hydrocarbon C₅H₁₂ is

Which of the following represents the given sequence of hybridisation of carbon atoms from left to right sp², sp², sp, sp?

Which of the following statements is not true?

Wurtz reaction may be used to unite

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

Study the given figure and label X, Y and Z.

Which of the following is not a redox reaction?

The hybridisation of carbons of C – C single bond of HC ≡ C – CH = CH₂ is

In the Geiger-Marsden scattering experiment, in case of head-on collision the impact parameter should be

An alkene CH₃CH = CH₂ is treated with B₂H₆ in presence of H₂O₂. The final product formed is

An isotone of ⁷⁶₃₂Ge is

Two stable isotopes ⁶Li and ⁷Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. The atomic weight of lithium is

A mixture of 1-iodoethane and 1-iodopropane is treated with sodium metal and dry ether to carry out Wurtz reaction. Which of the following hydrocarbons will be formed?

Which species is acting as a reducing agent in the following reaction? 14H⁺ + Cr₂O₇²⁻ + 3Ni → 2Cr³⁺ + 7H₂O + 3Ni²⁺

The graph of the total number of α-particles scattered at different angles in a given interval of time for α-particle scattering in the Geiger-Marsden experiment is given by

Which alkane is produced when sodium salt of butanoic acid is heated with soda lime?

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

The natural boron of atomic weight 10.81 is found to have two isotopes ¹⁰B and ¹¹B. The ratio of abundance of isotopes of natural boron should be

Which one is the wrong statement

Which of the following spectral series falls within the visible range of electromagnetic radiation?

Cumene on reaction with oxygen followed by hydrolysis gives

The radius of first Bohr's orbit for hydrogen is 0.53 Å. The radius of third Bohr's orbit would be

The reaction, CH₂=CH−CH₃ + HBr → CH₃−CHBr−CH₃ is an example of

According to VSEPR theory,

The shortest wavelength present in the Paschen series of spectral lines is (R = 1.097 × 10⁷ m⁻¹)

The negative part of the addendum (the molecule to be added) adds on to the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as

The relation between the orbital radius and the electron velocity for a dynamically stable orbit in a hydrogen atom is (where, all notations have their usual meanings)

The shape of water molecule which should be tetrahedral has a bent or distorted tetrahedral shape with a bond angle 104.5°. What could be the reason for this?

Which of the following reactions follows Markovnikov’s rule?

In Balmer series of emission spectrum of hydrogen, first four lines with different wavelength Hα, Hβ, Hγ and Hδ are obtained. Which line has maximum frequency out of these?

Which step is chain propagation step in the following mechanism? (i) Cl₂ → hν → Cl• + Cl• (ii) Cl• + CH₄ → •CH₃ + HCl (iii) Cl• + Cl• → Cl₂ (iv) •CH₃ + Cl → CH₃Cl

The wavelength of radiation emitted is λ₀ when an electron jumps from the third to second orbit of hydrogen atom. For the electron jumping from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be

Identify the products X and Y formed in the following reaction. CH₃—CH₂—CH=CH—CH₃ + HCl → X + Y

The magnetic moment of a divalent ion in aqueous solution with atomic number 25 is

Match the column I with column II to identify the products of oxidation of alkanes and mark the appropriate choice.

The shortest wavelength in the Balmer series is (R = 1.097 × 10⁷ m⁻¹)

Few reactions of alkanes are given below. Identify the name of the reaction which is not correctly matched with the reaction.

Match the molecules given in column I with their shapes given in column II and mark the appropriate choice.

The statements (i) In filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital. (ii) When two electrons are placed in two different orbitals, energy is lower if the spins are parallel. are valid for

Carbon is in the lowest oxidation state in

In the given reactions: (i) CH₃Br − Na, ether → X − Br₂, hv → Y − Na, ether → Z (ii) CH₃COOH − NaOH, CaO → X − NaOH, CaO → Y − Br₂, hv → Z Identify X, Y and Z.

Which of the following does not show octahedral geometry?

According to Bohr's theory, the wave number of last line of Balmer series is (R = 1.1 × 10⁷ m⁻¹)

The first line of the Lyman series in a hydrogen spectrum has a wavelength of 1210 Å. The corresponding line of a hydrogen-like atom of Z = 11 is equal to

Structure of XeF₄ is

For azimuthal quantum number l = 3, the maximum number of electrons will be Maximum number of electrons in a subshell with l = 3 and n = 4 is

Which of the following is a decreasing order of oxidation states of the central atoms?

What is the order of reactivity of hydrogen atoms attached to carbon atom in an alkene?