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A mixture of CaCl^2 and NaCl weighing 4.44g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate . The calcium carbonate so obtainable is heated strongly to get 0.56g of CaO . The percentage of NaCl in mixture is

If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction.
The numerical value of energy involved in the given process $K\to K^{-}$ is less than that of which of the following processes?

A six-coordinate complex of formula $CrC{l}_6.6H_2$O is green in colour. A $0.1\text{M}$ solution of the complex when treated with excess of $AgN{O}_3$ gave $28.7\text{g}$ of white precipitate. The formula of the complex would be:

In the isoelectronic series of metal carbonyls, the 'M-C' bond strength is expected to increase in the order:

Which of the following is the correct expanded form of 406?

Which one of the given carbides yields methane on hydrolysis?

The half-life of a substance in a certain enzyme-catalysed reaction is $138s$. The time required for the concentration of the substance to fall from $1.28{\text{mg L}}^{-1}$ to $0.04{\text{mg L}}^{-1}$ is:

Arrange the following molecules in increasing order of $\sigma$ to $\pi$ bond ratio:

Mark the incorrect statements.
(a)Catalyst provides an alternative pathway to reaction mechanism
(b)Catalyst raises the activation energy
(c)Catalyst lowers the activation energy
(d)Catalyst alters enthalpy change of the reaction

Find out the correct order of basic strength among the given compounds.

An analytic balance has uncertainty In measurement equal to $\pm$1 mg. Then report the result in terms of percentage if the weight of a compound is

(a) 1 g

(b) 10 g

(c) 100 g

Assertion (A) Olefinic monomers undergo addition polymerisation.

Reason (R) Polymerisation of vinyl chloride is initiated by peroxides/persulphates.

(a) Assertion and Reason both are correct statement But reason does not explain Assertion.

(b) Assertion and Reason both are correct statement and Reason explains the Assertion.

(c) Both assertion and reason are wrong statements.

(d) Assertion is correct statement and Reason is wrong statement.

(e) Assertion is wrong statement and reason is correct statement.

Which of the following has largest radius?

Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm³ at 27°C. R = 0.083 bar dm³ K^–1 mol^–1.

1.25 moles of a gas A and y moles of a gas B exert a pressure of 300 Pa in a container of volume $10m^3$ at $1000K$. Find the value of y in terms of R (where R is the gas constant in $J{K}^{-1}mo{l}^{-1}$ )

A $0.50\text{g}$ sample of rock was found to have $2.5\times {10}^{-6}\text{mol}$ of ${}_{19}^{40}K(t_{1/2}=1.3\times {10}^9\text{years})$ and $7.5\times {10}^{-6}{\text{mol of}}_{20}^{40}Ca$. How old is the rock?

Calcium crystallises in a face centred cubic unit cell .The volume of unit cell is $1.72\times {10}^{-22}c{m}^3$. What will be its density $\left(ingc{m}^{-3}\right)$ if it contains $0.5\%$ of Schottky defect?

Ziegler - Natta catalyst is

Tollen’s reagent is

Which among the following is the correct decreasing order of covalent character?

An organic compound contains 40% of C, 6.66 % of H, 53.34 % of O. Predict it's molecular formula. The density of the compound at STP is 0.00535 g/mL.

A Fischer projection of (2R, 3S)-2,3-butanediol is:

How many electrons have magnetic Quantum number equal to zero in the ground state electronic configuration of Fe+3 ion

0.1 M NaCl and 0.1 M CH₃COOH are kept in separate containers. If their osmotic pressures Are P₁ and P₂ respectively then the correct statement is:

The central dogma of molecular genetics states that the genetic information flows from:

Which of the following is heterocyclic?