Calcium is obtained by :

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ANAND_YADAV Asked Jul 25, 2023

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In the synthesis of sodium carbonate by Solvay (or ammonia soda) process the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in the process is —

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ANAND_YADAV Asked Jul 25, 2023

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Which of the following statements about the highly pure dilute solution of sodium in liquid ammonia at -33ºC is incorrect?

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ALOK_RAJ Asked Nov 28, 2023

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When chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained.

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Aayush Asked Feb 1

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A substance absorbs CO2 and violently reacts with water. The substances is —

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Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through (A), it turns cloudy.

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Aayush Asked Jan 31

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Lithium only forms monoxide when heated in oxygen. Sodium forms monoxide and peroxide in excess of oxygen. Other alkali metals form superoxide with oxygen i.e. MO2.

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ALOK_RAJ Asked Jul 25, 2023

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Which of the following statements are true about the alkali metals?

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ANAND_YADAV Asked Jul 25, 2023

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Bubbling CO2 through which of the following will produce a white precipitate —

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ANAND_YADAV Asked Jul 25, 2023

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Which of the following compounds on thermal decomposition yields a basic as well as an acidic oxide?

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ANAND_YADAV Asked Jul 25, 2023

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Sodium and potassium react with water much more vigorously than lithium because :

ANAND_YADAV Asked Jul 25, 2023

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Aayush Asked Feb 1

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The law of multiple proportions is illustrated by the pair of compounds —

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Chandan Asked Aug 26, 2023

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In the term $\left(P+a n^{2} N^{2}\right)$ proposed by Vander Waal

Chandan Asked Aug 26, 2023

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Chandan Asked Sep 11, 2023

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A long spring is stretched by 2 cm, it potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be —

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Aayush Asked Jan 31

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Weight of copper oxide obtained by treating 2.16 g of metallic copper with nitric acid and subsequent ignition was 2.7 g.

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Aayush Asked Feb 1

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Which one is the best example of law of conservation of mass?

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Aayush Asked Jan 3

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We have taken a saturated solution of $AgBr$. $K _{ sp }$ of $AgBr$ is $12 \times 10^{-14}$.

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Aayush Asked Jan 3

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The solubility of $\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right] ClO _{4}$ ____________, if the $\lambda_{ Co \left( NH _{3}\right)_{4} Cl _{2}^{+}}=50, \lambda_{ ClO _{4}{ }^{-}}=70$ and the measured resistance was $33.5 \Omega$ in a cell with cell constant of $0.20$ is ____________

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ALOK_RAJ Asked Nov 28, 2023

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Of the following statements about enzymes which is/are true?

ALOK_RAJ Asked Nov 28, 2023

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ALOK_RAJ Asked Oct 18, 2023

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A resistance of $50 \Omega$ is registered when two electrodes are suspended into a beaker containing a dilute solution of a strong electrolyte such that exactly half of the them are submerged into solution.

ALOK_RAJ Asked Oct 18, 2023

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ALOK_RAJ Asked May 7, 2022

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Most efficient overlapping is

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ALOK_RAJ Asked May 7, 2022

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In which one of the following pairs the radius of the second species is greater than that of the first?

ALOK_RAJ Asked May 7, 2022

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Aayush Asked Apr 11

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1.0 g of hydrogen is heated to combine with 80.0 g of bromine and 1.0 g of calcium (valency =2) combines with 4.0 g of bromine.

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ALOK_RAJ Asked Nov 22, 2023

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How many molecules of acetylene would be formed when 10.0g of calcium carbide is treated with water?

ALOK_RAJ Asked Nov 22, 2023

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Aayush Asked Feb 1

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10 moles of C3O2 do not contain :

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Aayush Asked Jan 4

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Acetic acid has $K _{ a }=1.8 \times 10^{-5}$ while formic acid has $K _{ a }=2.1 \times 10^{-4}$.

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Aayush Asked Jan 3

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Find $E ^{0}$ for the following reaction : $MnO _{4}^{-}+4 H ^{+}+3 e ^{-} \longrightarrow MnO _{2}+2 H _{2} O$

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ALOK_RAJ Asked Dec 1, 2023

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Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below.

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ALOK_RAJ Asked Oct 18, 2023

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You are given the following cell at 298K, $Zn \left| Zn^{++} _{( aq .)}\right|| HCl ( aq .)|\left| H _{2}( g )\right| Pt$ with $E _{\text {cell }}=0.701 V$ and $E _{ Zn ^{2+} / Zn }^{0}=-0.76 V$.

ALOK_RAJ Asked Oct 18, 2023

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ALOK_RAJ Asked Jul 25, 2023

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39.4 kg of gold was recovered from a Smuggler. The number of atoms of gold recovered are —

ALOK_RAJ Asked Jul 25, 2023

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ALOK_RAJ Asked Apr 24, 2022

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A student made the following observations in the laboratory:

ALOK_RAJ Asked Apr 24, 2022

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Shiv roshan kushwaha Asked Apr 3, 2022

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Which of the following can show disproportionation reaction :

Shiv roshan kushwaha Asked Apr 3, 2022

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Chandan Asked Sep 15, 2023

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A body of mass m kg is rotating in a vertical circle at the end of a string of length r metre.

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ALOK_RAJ Asked Aug 3, 2023

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Thomas throws a silver coin in the sea. The density of the coin is 0.985 gm/m3. Will the coin float on the surface of water or it will sink?

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ANAND_YADAV Asked Jul 29, 2023

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The Young's modulus of a material of wire is 12.6 × 1011 dyne /cm2. Its value in MKS system is :

ANAND_YADAV Asked Jul 29, 2023

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ANAND_YADAV Asked Jul 29, 2023

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$\int \frac{x d x}{\sqrt{2 a x-x^{2}}}=a^{n} \sin ^{-1}\left[\frac{x}{a}-1\right]$. The value of $n$ is —

ANAND_YADAV Asked Jul 29, 2023

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Calcium is obtained by :

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