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How many ${}^{12}\text{C}$ atoms are there in $24\text{mg}$ of ${}^{12}\text{C}$?

Distinction between primary, secondary and tertiary alcohol is done by [MP PMT/PET 1988; RPMT 2000]

If uncertainty in position and momentum are equal, then uncertainty in velocity is eqaul to:

Isotone of ${}_{32}^{76}Ge$ is/are:

Which of the following has the maximum covalent radii?

The correct decreasing order of reactivity among the following is

The standard heat of combustion of solid boron is equal to

For the given reactions ,the name of the reaction which isn't correctly matched is :

The pair of compounds having metals in their highest oxidation state is

Review the equilibrium and choose the correct statement

$HCl{O}_4+H_{2}O\rightleftharpoons H_3{O}^{+}+Cl{O}_4^{-}$

The energy of an electron in the ground state of a $H$-atom is $-2.15\times {10}^{-18}J$. The Ionisation energy of the atomic hydrogen in terms of ${10}^{5}Jmo{l}^{-1}$ is:

Which of the following has the largest size?

Solid ammonium carbamate dissociates into $N{H}_3$ and $C{O}_2$ as $N{H}_{2}COON{H}_4\rightleftharpoons N{H}_3\left(g\right)+C{O}_2\left(g\right).$ The total pressure at equilibrium is 5 atm. Calculate the equilibrium constnat $K_p.$

The rate of a first order reaction is $1.8\times {10}^{-3}mol{L}^{-1}mi{n}^{-1},$ when the initial concentration is 0.3 mol $L^{-1}$ . The rate constant in the units of second is

Which one of the following is used to make non-stick cookware

Which of the following compounds has a zero dipole moment?

A soft silver-white metal (A) burns with a golden-yellow flame to give a yellow powder (B) which on treatment with water liberates oxygen giving a clear solution (C). The solution, when mixed with $Al$, attacks the metal, liberating a gas (D) and forming a water-soluble compound (E). The metal (A) dissolves in liquid $N{H}_3$ to form a deep blue solution which is a good conductor and an excellent reducing agent. Identify (D):

Solubility products of $Al(OH{)}_3$ and $Zn(OH{)}_2$ are $2.7\times {10}^{-23}and3.2\times {10}^{-14}$ respectively. If to a solution of 0.1 M each of $A{l}^{3+}andZ{n}^{2+}ions,N{H}_{4}OH$ is added in increasing amounts which of the following will be precipitated first ?

$Ca+O\to \underset{–}{A}$

$Ca+N_2\to \underset{–}{B}$. A & B are

Which of the following formulae are correctly mentioned?

What is the ratio of time period in the second orbit of hydrogen atom to the third orbit of $H{e}^{+}$ ion?

Which of the following polymers can be used for lubrication and as an insulator?

Which of the following molecule does not have a plane of symmetry?

List-I contains questions related to the reaction sequence and List-II contains their answers.





Which of the following options has the correct combination considering List-I and List-II?

Which of following correctly represents the relation between capillary rise h and capillary radius r?

In the hydrolysis of ICl, the products are:

Gaseous benzene reacts with hydrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction: $C_6{H}_6\left(g\right)+3H_2\left(g\right)\to C_6{H}_{12}\left(g\right).$A mixture of $C_6{H}_6$ and excess $H_2$ has a pressure of 60 mm of Hg in an unknown volume. After the gas has been passed over a nickel catalyst and all benzene converted to cyclohexane, the pressure of the gas was 30 mm of Hg at same volume and temperature. The fraction of $C_6{H}_6$(by volume) present in the original volume is___.

(1) $-C\equiv N$ , (2) $-CON{H}_2$ , (3) $-\stackrel{O}{\stackrel{||}{C}}-$, (4)$-CHO$

The decreasing order of priority for the given functional groups (for IUPAC nomenclature) is:

A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molecular mass = 60g/mole) in the same solvent . If the densities of both the solutions are assumed to be equal to 1g/cc, molar mass of substance will be

For which of the following reactions, $K_P=K_C$ ?

Arrange the following in increasing order of their basic strength.

$C{H}_{3}CO{O}^{\ominus },FC{H}_{2}CO{O}^{\ominus },ClC{H}_{2}CO{O}^{\ominus },BrC{H}_{2}CO{O}^{\ominus }$

The number of isoelectronic species among the following are:

$C{a}^{2+},Ar,C{l}^{-},K^{+},Kr,F^{-}$

Acetamide changes into methylamine by

When 0.0976 g of magnesium was heated in air, 0.1627 g of magnesium oxide $\left(MgO\right)$ was produced. What is the mass of oxygen needed to produce 0.1627 g of $MgO$?

In Hofmann bromamide degradation, one of the important steps is the migration of

Ferric hydroxide sol is
positively charged colloid. The coagulating power of

ions would be in the
order

The correct decreasing order of atomic size of the following species is:

$K^{+},C{l}^{-},S^{2-},C{a}^{2+}$

In metal deficiency defect

The ratio of magnetic moments of $Fe\left(III\right)$ and $Co\left(II\right)$ is:

Match the reactions with products:

Arrange the following groups in the order of decreasing (+I) effect with reference to hydrogen.

During a flame test, the alkaline earth metal that gives orange-red colour is:

A compound 'X' reacts with conc. Sulphuric acid to give an alkene. The alkene reacts with bromine and subsequent treatment of the product with alcoholic KOH yields propyne. The formula of the compound is

For a $3s-$ orbital

$\Psi \left(3s\right)=\frac{1}{9\sqrt{3}}{\left(\frac{1}{a_0}\right)}^{\frac{3}{2}}(6-6\sigma +{\sigma }^2)e^{\frac{-\sigma }{2}};\text{where}\sigma =\frac{2r.Z}{3a_0}$

What is the maxium radial distance of node from nucleus?

How many $H_{2}O$ should be added to the RHS of the following equation to balance number of oxygen atoms on the left ?



$6F{e}^{2+}+C{r}_2{O}_7^{2-}+14H^{+}⟶6F{e}^{3+}+2C{r}^{3+}+$ ___________