Pumice stone is an example of

Which of the following statements are NOT correct? A. Hydrogen is used to reduce heavy metal oxides to metals. B. Heavy water is used to study reaction mechanism. C. Hydrogen is used to make saturated fats from oils. D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element. E. Hydrogen reduces oxides of metals that are more active than iron. Choose the most appropriate answer from the options given below.

The given compound CH=CH−CH−CH_2−CH_3 | X Is an example of____

Match List-I with List-II List - I A. Coke B. Diamond C. Fullerene D. Graphite List - II I. Carbon atoms are sp³ hybridised. II. Used as a dry lubricant III. Use as a reducing agent IV. Cage like molecules Choose the correct answer from the options given below:

In Lassaigne’s extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with $Fe^{2+}$ due to the formation of -

Given below are two statements:$\newline$Assertion A: A reaction can have zero activation energy.$\newline$Reason R: The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value is called activation energy.$\newline$In the light of the above statements, choose the correct answer from the options given below.

Consider the following reaction and identify the product (P). CH_3−CH−CH−CH_3 | OH + HBr → Product (P)

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

The relation between n_m (the number of permissible values of magnetic quantum number (m)) for a given value of azimuthal quantum number (l), is

Complete the following reaction: [C] is ________

The right option for the mass of CO$_2$ produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40)$\newline {CaCO}_3 \xrightarrow{1200 K} CaO + CO_2$

Assertion A: In equation $\Delta_r G = - nF E_{cell},$ value of $\Delta_r G$ depends on n.$\\$Reason R: $E_{cell}$ is an intensive property and $\Delta_r G$ is an extensive property.

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

Homoleptic complex from the following complexes is:

The number of sigma bonds, pi bonds and lone pair of electrons in pyridine, respectively, are:

Intermolecular forces are forces of attraction and repulsion between interacting particles that will include:$\newline$A. Dipole-dipole forces$\newline$B. Dipole-induced dipole forces$\newline$C. Hydrogen bonding$\newline$D. Covalent bonding$\newline$E. Dispersion forces.$\newline$Choose the most appropriate answer from the options given below:

Select the correct statement from the following: \newline \text{A. Atoms of all elements are composed of two fundamental particles.$\newline$ B. The mass of the electron is $9.10939 \times 10^{-31} kg. \newline$C. All the isotopes of a given element show the same chemical properties.$\newline$D. Protons and electrons are collectively known as nucleons.$\newline$E. Dalton’s atomic theory, regarded the atom as an ultimate particle of matter.$\newline$ Choose the correct answer from the options given below:

Some tranquilizers are listed below. Which one from the following belongs to barbiturates?

Assertion A: Helium is used to dilute oxygen in diving apparatus.$\\$Reason R: Helium has high solubility in O$_2. \\$Choose the correct answer from the options given below:

Assertion A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.$\\$Reason R: The deep blue solution is due to the formation of amide.$\\$Choose the correct answer from the options given below:

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:

The correct order of energies of molecular orbitals of $N_2$ molecule is:

Amongst the following, the total number of species NOT having eight electrons around central atom in its outermost shell is, NH$_3,$ AlCl$_3,$ BeCl$_2,$ CCl$_4,$ PCl$_5$:

Which one is an example of heterogeneous catalysis?

Which one of the following statements is correct?

Which amongst the following options is correct graphical representation of Boyle’s Law?

Identify the product in the following reaction:$$

Which amongst the following molecules produces polymerization to form neoprene?

The conductivity of centimolar solution KCl at 25$^\circ$C is 0.0210 ohm$^{-1}$ cm$^{-1}$ and resistance of the cell containing the solution at 25$^\circ$C is 60 ohm. The value of cell constant is:

Identify product (A) in the following reaction:

The stability of Cu$^{2+}$ is more than Cu$^{+}$ salts in aqueous solution due to -

For a certain reaction, the rate = k[A]^2[B]. When the initial concentration of A is tripled keeping concentration of B constant, the initial rate would

Given below are two statements:$\\$Statement I: A unit formed by the attachment of a base at 1' position of sugar is known as nucleoside.$\\$Statement II: When nucleoside is linked to phosphorous acid at 5' - position of sugar moiety, we get nucleotide.

Which of the following reaction will NOT give primary amine as the product?

The element expected to form largest ion to achieve the nearest noble gas configuration is:

A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is A$_xB_y,$ then the value of x + y is:

Which amongst the following will be most readily dehydrated under acidic conditions?

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

Match List-I with List-II:

Which of the following statements are incorrect?$\\$A. All the transition metals except scandium form MO oxides which are ionic.$\\$B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in Sc$_2$O$_3$ to Mn$_2$O$_7. \\$C. Basic character increases from V$_2$O$_5$ to V$_2$O$_3. \\$D. V$_2$O$_5$ dissolves in acids to give VO$_4^{3-}$ salts.$\\$E. CrO is basic but Cr$_2$O$_3$ is amphoteric.

Which of the following compound is most stable?

The reaction that does NOT take place in a blast furnace between 900 K to 1500 K temperature range during extraction of iron is:

The equilibrium concentrations of the species in the reaction A + B $\rightleftharpoons$ C + D are 2, 3, 10 and 6 mol L$^{-1}$, respectively at 300 K. $\Delta G^{\circ}$ for the reaction is (R = 2 cal/mol K)

Consider the following compounds/species. The number of compounds/species which obey Huckel's rule is

On balancing the given redox reaction,$\newline a Cr_2O_7^{2-} + b SO_3^{2-} (aq) + c H^+ (aq) \rightarrow 2a Cr^{3+} (aq) + b SO_4^{2-} (aq) + \frac{c}{2} H_2O (\ell) \newline$ the coefficients are:

Identify the final product obtained in the following sequence of reactions.

Consider the following reaction: Identify products A and B

Identify the major product obtained in the following reaction.

Given below are two statements:$\\$Statement-I: The nutrient deficient water bodies lead to eutrophication.$\\$Statement-II: Eutrophication leads to decrease in the level of oxygen in the water bodies.

What fraction of one edge centered octahedral void lies in one unit cell of FCC?