Neet Chemistry

Neet Chemistry

1 / 119

1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to :

2 / 119

The highest number of helium atoms is in :

3 / 119

A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is:

(Given atomic masses of A = 64 B = 40 C = 32u )

$$AB_2C_2$$

4 / 119

The right option for the mass of CO2 produced by heating 20 g of 20% pure limestone is :

(Atomic mass of Ca = 40 ) $$\lbrack CaCO_3\;\xrightarrow{1200K}CaO\;+\;CO_2\;\rbrack$$

5 / 119

What mass of 95% pure CaCO3 will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction?

$$CaCO_3(s)\;+\;2HCl(aq)\;\rightarrow\;CaCl_2(aq)\;+\;CO_2(g)\;+\;H_2O(l)$$

[Calculate upto second place of decimal point]

6 / 119

An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is:

[Atomic wt. of C is 12, H is 1]

7 / 119

Which one of the following has maximum number of atoms ?

8 / 119

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :

9 / 119

The density of 2M aqueous solution of NaOH is $$1.28g\;/\;cm^3$$. The molality of the solution is :

Given that molecular mass of $$NaOH\;=\;40\;g\;mol^{-1}$$

10 / 119

In which case is number of molecules of water maximum?

11 / 119

Calculate the energy in joule corresponding to light of wavelength 45 nm:

12 / 119

A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is:

13 / 119

Select the correct statements from the following:

(A) Atoms of all elements are composed of two fundamental particles.
(B) The mass of the electron is .
(C) All the isotopes of a given elements show same chemical properties.
(D) Protons and electrons are collectively known as nucleons.
(E) Dalton's atomic theory, regarded the atom as an ultimate particle of matter.

Choose the correct answer from the options given below:

14 / 119

According to law of photochemical equivalence the energy absorbed (in ergs/mol) is given as

15 / 119

In the photo-electron emission, the energy of the emitted electron is :

16 / 119

If the energy of a photon is given as $$3.03\times10^{-19}J$$ then, the wavelength $$\left(\lambda\right)$$ of the photon is :

17 / 119

The value of Planck's constant is  $$6.63\times10^{-34}\;Js$$. The velocity of light is
$$3.08\times10^8\;ms^{-1}$$ . Which value is closest to the wavelength in nanometres of a quantum of light with frequency of $$8\times10^{15}\;s^{-1}$$ ?

18 / 119

The energy absorbed by each molecule $$(A_2)$$ of a substance is $$4.4\times10^{-19}J$$ and bond energy per molecule is $$4.4\times10^{-19}J$$. The kinetic energy of the molecule per atom will be :

19 / 119

 The energies  of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e.,  will be:

20 / 119

Arrange the following elements in increasing order of first ionization enthalpy : 

Li, Be, B, C, N

Choose the correct answer from the options given below:

21 / 119

Arrange the following elements in increasing order of electronegativity:

N, O, F, C, Si

Choose the correct answer from the options given below:

22 / 119

If the atomic number of an element is 33, It will be placed in the periodic table in the :

23 / 119

The electronic configuration of an element is  . What is the atomic number of the element, which is just below the above element in the periodic table ?

24 / 119

The element, with atomic number 118, will be :

25 / 119

An atom has electronic configuration  , you will place it in which group ?

26 / 119

The element Z = 114 has been discovered recently it will belong to which of the following family/group and electronic configuration?

27 / 119

Match the following:

                        Oxide                             Nature
                      (A) CO                         (i) Basic
                      (B) BaO                       (ii) Neutral
                    (C)                       (iii) Acidic
                    (D)                       (iv) Amphoteric

Which of the following is correct option ?

28 / 119

Identify the incorrect match:

                          Name               IUPAC Official Name
                  (A) Unnilunium                     (i) Mendelevium
                  (B) Unnitrium                     (ii) Lawrencium
                  (C) Unnilhexium                     (iii) Seaborgium
                  (D) Unununnium                   (iv) Darmstaditium

29 / 119

The IUPAC name of an element with atomic number 119 is:

30 / 119

Which of the following does not apply to metallic bond ?

31 / 119

Among , the covalent bond character follows the order :

32 / 119

Among the following which compound will show the highest lattice energy ?

33 / 119

Strongest bond is in between :

34 / 119

The weakest among the following types of bonds is :

35 / 119

Which of the following pairs will form the most stable ionic bond ?

36 / 119

Linus Pauling received the Nobel Prize for his work on:

37 / 119

Which of the following compounds has a 3-centre bond?

38 / 119

Cation and anion combines in a crystal to form following type of compound:

39 / 119

The correct sequence of increasing covalent character is represented by:

40 / 119

The heat of combustion of carbon tois - 393.5kJ / mol . The heat released upon formation of 35.2 g of  from carbon and oxygen gas is:

41 / 119

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy  of the gas in joules will be :

42 / 119

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is: 

[Given that 1 L - bar = 100J ]

43 / 119

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure.

AB→ Isothermal expansion

AC→ Adiabatic expansion

Which of the following options is not correct?

44 / 119

An ideal gas expands isothermally from against a constant pressure of . The work done on the gas is:

45 / 119

The correct option for free expansion of an ideal gas under adiabatic condition is:

46 / 119

Which one among the following is the correct option for right relationship between  for one mole of ideal gas ?

47 / 119

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

48 / 119

The work done during reversible isothermal expansion of one mole of hydrogen gas at from pressure of 20 atmosphere to 10 atmosphere is:

49 / 119

Match List I with List II.

                    List I (Process)                   List II (Conditions)
              A. Isothermal process                 I. No heat exchange
              B. Isochoric process   II. Carried out at constant temperature
              C. Isobaric process       III. Carried out at constant volume
              D. Adiabatic process     IV. Carried out at constant pressure

Choose the correct answer from the options given below:

50 / 119

Identify the correct order of solubility in aqueous medium :

51 / 119

The value of $$K_{sp}$$ of $$CaCO_3$$ and $$CaC_2O_4$$ are $$4.7\times10^{-9}$$ respectively at $$25^\textdegree C$$.  If the mixture of these two is washed with water, what is the concentration of $$Ca^{2+}$$ ions in water?

52 / 119

Identify the correct order of solubility in aqueous medium:

53 / 119

Using the Gibbs' energy change, , for the following reaction,

the in water at is:

54 / 119

Which one of the following pairs of solution is not an acidic buffer?

55 / 119

 The  are respectively, Which one of the following salts will precipitate last if solution is added to the solution containing equal moles of ?

56 / 119

Consider the nitration of benzene using mixed conc. of . If a large amount of  is added to the mixture, the rate of nitration will be:

57 / 119

Concentration of the $$Ag^+$$ ions in a saturated solution of $$Ag_2C_2O_4$$ is $$2.2\times10^{-4}$$. Solubility product of $$2.2\times10^{-4}\;mol\;L^{-1}$$ is:

58 / 119

The solubility of in water is . The value of its solubility product  will be:

59 / 119

pH of a saturated solution of is 9. The solubility product  Is :

60 / 119

A compound contains atoms of three elements A, B and C. If the oxidation number of A is +2, B is +5, and that of C is -2, the possible formula of the compound is :

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62 / 119

 

63 / 119

64 / 119

What is the change in oxidation number of carbon in the following reaction?


0 to +4

65 / 119

The loss of electron is termed as:

66 / 119

Which of the following involves a redox reaction?

67 / 119

Zn gives  H2  gas with  and HCl but not with  because :

68 / 119

Which of the following reactions is the metal displacement reaction? (Choose the right option.)

69 / 119

Which reaction is NOT a redox reaction?

70 / 119

In borax bead test which compound is formed?

71 / 119

 

Choose the right answer

72 / 119

Choose the right answer

73 / 119

  

Choose the right answer

74 / 119

Which of the following structure is similar to graphite?

75 / 119

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence:

76 / 119

Which one of the following elements is unable to form $$MF_6^{3-}$$ 

77 / 119

Aluminium chloride in acidified aqueous solution forms a complex 'A', in which hybridisation state of Al is 'B'. What are 'A' and 'B', respectively?

78 / 119

Which of the following statement is not correct about diborane?

79 / 119

Taking stability as the factor, which one of the following represents correct relationship?

80 / 119

The correct IUPAC name of the compound:

81 / 119

Which nomenclature is not according to IUPAC system ?

82 / 119

The structure of isobutyl group in an organic compound is :

83 / 119

Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is:

84 / 119

The IUPAC name of the compound is :

85 / 119

The correct structure of 2, 6-Dimethyl-dec-4-ene is :

 

86 / 119

The correct IUPAC name of the following compound is:

87 / 119

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with  due to the formation of :

88 / 119

The number of o-bonds, π-bonds and lone pair of electrons in pyridine, respectively are :

89 / 119

Match List 1 with List II

List I                                                   List II
 (Molecule)                                       (Number and types of bond/s between two carbon atoms)

  1. Ethane                                         I. One o-bond and two π-bonds
  2. Ethene                                         II. Two π-bonds
  3. Carbon molecule, O2               III. One o-bond
  4. Ethyne                                         IV. One o-bond and one π-bond

Choose the correct answer from the options given below:

90 / 119

The correct statement regarding the comparison of staggered and eclipsed conformation of ethane, is:

91 / 119

With respect to the conformers of ethane, which of the following statements is true?

92 / 119

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is:

93 / 119

The alkane that gives only one mono-chloro product on chlorination with $$CI_2$$ in presence of diffused sunlight is:

94 / 119

 

 

Choose the right answer:

95 / 119

Dihedral angle of least stable conformer of ethane is:

96 / 119

Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is :

97 / 119

For the given reaction :

98 / 119

Given below are two statements:

Statement I: The boiling point of three isomeric pentanes follows the order n-pentane > isopentane > neopentane

Statement II: When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.

In the light of the above statements, choose the most appropriate answer from the options given below :

99 / 119

 

 

 

Choose the right answer

100 / 119

Which of the following statements, regarding the mole fraction (x) of a component in solution, is incorrect?

101 / 119

Molarity of liquid HCl will be, if density of solution is 1.17 g/cc:

102 / 119

1M, 2.5 litre NaOH solution is mixed with another 0.5 M. 3 litre NaOH solution. Then find out the molarity of resultant solution.

103 / 119

The mole fraction of the solution is: solute in one molal aqueous

104 / 119

25.3 g of sodium carbonate, $$Na_2CO_3$$ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ions, $$Na^+$$ and carbonate ions, $$CO_3^{2-}$$ are respectively: $$Na_2CO_3=106\;g\;mol^{-1}$$

105 / 119

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M $$HNO_3$$? The concentrated acid is 70% $$HNO_3$$.

106 / 119

What is the mole fraction of the solute in a 1.00 m aqueous solution?

107 / 119

Which of the temperature? following is dependent on

108 / 119

If molality of the dilute solution is doubled, the value of molal depression constant $$\left(K_f\right)$$ will be :

109 / 119

The density of 2 M aqueous solution NaOH is $$1.28\;g/cm^3$$ The molality of the solution is :

[Given that molecular mass of NaOH = $$40\;g\;mol^{-1}$$]

110 / 119

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to :

111 / 119

Molar conductivities at infinite dilution of  respectively. Lambda deg m for  will be :

Molar conductivities ( Lambda deg m ) at infinite dilution of are 126.4, 425.9 and  respectively. Lambda deg m for will be :

112 / 119

Limiting molar conductivity of $$NH_4OH$$ , Le Lambda $$\wedge^\circ(NH_4OH)$$ is equal to :

113 / 119

At  molar conductance of 0.1 molar aqueon At of ammonium hydroxide is and at infinite dilution its molar conductance  The degree or ionisation of ammonium hydroxide at the same concentration and temperature is :

114 / 119

Aqueous solution of which of the following compounds is the best conductor of electric current?

115 / 119

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

116 / 119

Following limiting molar conductivity are given as :

117 / 119

The molar conductivity of 0.007 M acetic acid is  . What is the dissociation constant of acetic acid? Choose the correct option.

118 / 119

The molar conductance of NaCl, HCI and at infinite dilution are 126.45, 426.16 and  respectively. The molar conductance of  at infinite dilution is :

119 / 119

The conductivity of centimolar solution of KCl at is $$0.0210ohm^{-1}cm^{-1}$$ and the resistance of the cell containing the solution at is 60 ohm. The value of cell constant is:

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