When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of A?
JEE WhatsApp Group
Sign in
Please select an account to continue using cracku.in
↓ →
JEE WhatsApp Group
Join Our JEE Preparation Group
Prep with like-minded aspirants; Get access to free daily tests and study material.
When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of A?
Login to view the detailed solution.
Arrange the following orbitals in decreasing order of energy.
A. n = 3, l = 0, m = 0
B. n = 4, l = 0, m = 0
C. n = 3, l = 1, m = 0
D. n = 3, l = 2, m = 1
The correct option for the order is:
Login to view the detailed solution.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The first ionization enthalpy of 3d series elements is more than that of group 2 metals
Reason (R): In 3d series of elements successive filling of d-orbitals takes place.
In the light of the above statements, choose the correct answer from the options given below:
Login to view the detailed solution.
.webp)
Incorrect statement for the use of indicator in acid-base titration is:
Given below are two statements:
Statement I: H$$_2$$O$$_2$$ is used in the synthesis of Cephalosporin
Statement II: H$$_2$$O$$_2$$ is used for the restoration of aerobic conditions to sewage wastes.
In the light of the above statements, choose the most appropriate answer from the options given below:
The element playing significant role in neuromuscular function and interneuronal transmission is:
.webp)
The Lewis acid character of boron tri halides follows the order:
In Dumas method for the estimation of N$$_2$$, the sample is heated with copper oxide and the gas evolved is passed over:
Login to view the detailed solution.
A hydrocarbon 'X' with formula C$$_6$$H$$_8$$ uses two moles of H$$_2$$ on catalytic hydrogenation of its one mole. On ozonolysis, 'X' yields two moles of methane dicarbaldehyde. The hydrocarbon 'X' is:
Login to view the detailed solution.
.webp)
The normal rain water is slightly acidic and its pH value is 5.6 because of which one of the following?
Evaluate the following statements for their correctness.
A. The elevation in boiling point temperature of water will be same for 0.1 M NaCl and 0.1 M urea.
B. Azeotropic mixture boil without change in their composition.
C. Osmosis always takes place from hypertonic to hypotonic solution.
D. The density of 32% H$$_2$$SO$$_4$$ solution having molarity 4.09 M is approximately 1.26 g mL$$^{-1}$$.
E. A negatively charged sol is obtained when KI solution is added to silver nitrate solution.
Choose the correct answer from the options given below:
Match List I with List II
List I List II
A. Physisorption I. Single Layer Adsorption
B. Chemisorption II. 20-40 kJ mol$$^{-1}$$
C. N$$_2$$(g) + 3H$$_2$$(g) $$\xrightarrow{Fe(s)}$$ 2NH$$_3$$(g) III. Chromatography
D. Analytical Application or Adsorption IV. Heterogeneous catalysis
Choose the correct answer from the options given below:
Login to view the detailed solution.
.webp)
Which one of the following statements is incorrect?
Which of the following elements have half-filled f-orbitals in their ground state?
A. Sm, B. Eu, C. Tb, D. Gd, E. Pm
(Given: atomic number Sm = 62; Eu = 63; Tb = 65; Gd = 64, Pm = 61)
Choose the correct answer from the options given below:
Login to view the detailed solution.
In the following halogenated organic compounds the one with maximum number of chlorine atoms in its structure is:
Login to view the detailed solution.
Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC results in (Q). When (Q) is heated with dil. NaOH we get (R). The final product (R) is:
(1) 
(2) 
(3) 
(4) 
An organic compound [A] (C$$_4$$H$$_{11}$$N), shows optical activity and gives N$$_2$$ gas on treatment with HNO$$_2$$. The compound [A] reacts with PhSO$$_2$$Cl producing a compound which is soluble in KOH. The structure of A is:
Login to view the detailed solution.
Which of the following compounds are not used as disinfectants?
A. Chloroxylenol
B. Bithional
C. Veronal
D. Prontosil
E. Terpineol
Choose the correct answer from the options given below:
Login to view the detailed solution.
_1.webp)
Given below are two statements:
Statement I: Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement II: The green colour observed is due to the formation of copper(I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below:
Compound A, C$$_5$$H$$_{10}$$O$$_5$$, given a tetraacetate with AC$$_2$$O and oxidation of A with Br$$_2$$ - H$$_2$$O gives an acid, C$$_5$$H$$_{10}$$O$$_6$$. Reduction of A with HI gives isopentane. The possible structure of A is:
Assume carbon burns according to following equation:
$$2C(s) + O_2(g) \rightarrow 2CO(s)$$
when 12 g carbon is burnt in 48 g of oxygen, the volume of carbon monoxide produced is ______ $$\times 10^{-1}$$ L at STP [nearest integer]
[Given: Assume CO as ideal gas, Mass of C is 12 g mol$$^{-1}$$, mass of O is 16 g mol$$^{-1}$$ and molar volume of an ideal gas at STP is 22.7 L mol$$^{-1}$$]
Login to view the detailed solution.
Amongst the following, the number of species having the linear shape is
XeF$$_2$$, I$$_3^+$$, C$$_3$$O$$_2$$, I$$_3^-$$, CO$$_2$$, SO$$_2$$, BeCl$$_2$$ and BCl$$_2^\ominus$$
Login to view the detailed solution.
Enthalpies of formation of CCl$$_4$$(g), H$$_2$$O(g), CO$$_2$$(g) and HCl are -105, -242, -394 and -92 kJ mol$$^{-1}$$ respectively. The magnitude of enthalpy of the reaction given below is kJmol$$^{-1}$$. (nearest integer)
$$CCl_4(g) + 2H_2O(g) \rightarrow CO_2(g) + 4HCl(g)$$
At 298 K, the solubility of silver chloride in water is $$1.434 \times 10^{-3}$$ g L$$^{-1}$$. The value of $$-\log K_{sp}$$ for silver chloride is
(Given mass of Ag is 107.9 g mol$$^{-1}$$, and mass of Cl is 35.5 g mol$$^{-1}$$)
The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater than 400 kJ mol$$^{-1}$$ and forming stable super oxide is
A sample of a metal oxide has formula M$$_{0.83}$$O$$_{1.00}$$. The metal M can exist in two oxidation states +2 and +3. In the sample of M$$_{0.83}$$O$$_{1.00}$$, the percentage of metal ions existing in +2 oxidation state is %. (nearest integer)
The resistivity of a 0.8M solution of an electrolyte is $$5 \times 10^{-3}$$ $$\Omega$$cm. Its molar conductivity is $$ 10^4$$ $$\Omega^{-1}$$ cm$$^2$$ mol$$^{-1}$$. (Nearest integer)
The rate constant for a first order reaction is 20 min$$^{-1}$$. The time required for the initial concentration of the reactant to reduce to its $$\dfrac{1}{32}$$ level is ______ $$\times 10^{-2}$$ min. (Nearest integer)
If the CFSE of [Ti(H$$_2$$O)$$_6$$]$$^{3+}$$ is -96.0 kJ/mol, this complex will absorb maximum at wavelength ______ nm. (nearest integer)
Assume Planck's constant (h) = $$6.4 \times 10^{-34}$$ Js, Speed of light (c) = $$3.0 \times 10^8$$ m/s and Avogadro's constant (N$$_A$$) = $$6 \times 10^{23}$$/mol.
The number of molecules which gives haloform test among the following molecules is:
Login to view the detailed solution.
Educational materials for JEE preparation
Share