Neet Chemistry

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 :

The highest number of helium atoms is in :

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 )

$$AB_2C_2$$

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

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

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]

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]

Which one of the following has maximum number of atoms ?

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

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

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

In which case is number of molecules of water maximum?

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

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:

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:

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

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

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

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 $$8\times10^{15}\;s^{-1}$$ ?

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 :

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

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:

Arrange the following elements in increasing order of electronegativity:

N, O, F, C, Si

Choose the correct answer from the options given below:

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

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 ?

The element, with atomic number 118, will be :

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

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

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 ?

Identify the incorrect match:

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

Which of the following does not apply to metallic bond ?

Among , the covalent bond character follows the order :

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

Strongest bond is in between :

The weakest among the following types of bonds is :

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

Linus Pauling received the Nobel Prize for his work on:

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

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

The correct sequence of increasing covalent character is represented by:

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:

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 :

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 ]

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?

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

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

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

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

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

Match List I with List II.

Choose the correct answer from the options given below:

Identify the correct order of solubility in aqueous medium :

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?

Identify the correct order of solubility in aqueous medium:

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

the in water at is:

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

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

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:

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:

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

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

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 :

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

0 to +4

The loss of electron is termed as:

Which of the following involves a redox reaction?

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

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

Which reaction is NOT a redox reaction?

In borax bead test which compound is formed?

Choose the right answer

Choose the right answer

Choose the right answer

Which of the following structure is similar to graphite?

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

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

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

Which of the following statement is not correct about diborane?

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

The correct IUPAC name of the compound:

Which nomenclature is not according to IUPAC system ?

The structure of isobutyl group in an organic compound is :

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

The IUPAC name of the compound is :

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

The correct IUPAC name of the following compound is:

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 :

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

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:

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

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

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:

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

Choose the right answer:

Dihedral angle of least stable conformer of ethane is:

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 :

For the given reaction :

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 :

Choose the right answer

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

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

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.

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

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: $$Na_2CO_3=106\;g\;mol^{-1}$$

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% $$HNO_3$$.

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

Which of the temperature? following is dependent on

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

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 = $$40\;g\;mol^{-1}$$]

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

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 :

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

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 :

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

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

Following limiting molar conductivity are given as :

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

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 :

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: