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

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Aayush Asked Feb 1

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Aayush Asked Feb 1

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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.

Aayush Asked Feb 1

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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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ANAND_YADAV Asked Jul 25, 2023

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

ANAND_YADAV Asked Jul 25, 2023

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Aayush Asked Feb 1

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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 —

Aayush Asked Feb 1

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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?

ANAND_YADAV Asked Jul 25, 2023

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ANAND_YADAV Asked Jul 30, 2023

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When white phosphorus reacts with caustic soda, the products are PH3 and NaH2PO2. This reaction is an example of :

ANAND_YADAV Asked Jul 30, 2023

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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?

ANAND_YADAV Asked Jul 25, 2023

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ANAND_YADAV Asked Jul 25, 2023

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Calcium is obtained by :

ANAND_YADAV Asked Jul 25, 2023

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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.

Aayush Asked Jan 31

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Chandan Asked Oct 15, 2023

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A gas bubble from an explosion under water oscillates with a time period T which is proportional to $P ^{a} \rho^{b} E ^{c}$ where $P$ is the pressure

Chandan Asked Oct 15, 2023

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Chandan Asked Sep 15, 2023

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The coagulation of 10 mL of a colloidal sol of gold is completely prevented by addition of 0.25 g of a substance X to it before adding 1 mL of 10% NaCl solution. The gold number of X is

Chandan Asked Sep 15, 2023

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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 ____________

Aayush Asked Jan 3

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ALOK_RAJ Asked Nov 19, 2023

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A solution contains 0.18g per mL of a substance X whose molecular weight is

ALOK_RAJ Asked Nov 19, 2023

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ANAND_YADAV Asked Aug 2, 2023

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A Carnot refrigerator extracts heat from water at $0^{\circ}{C}$ and rejects it to room at $24.4^{\circ}{C}$. The work required by the refrigerator for every $1{kg}$ of water converted into ice is

ANAND_YADAV Asked Aug 2, 2023

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ALOK_RAJ Asked Nov 28, 2023

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The pH of pure water at $25^{\circ} {C}$ and $35^{\circ} {C}$ are 7 and 6 respectively. The heat of formation of water from H+ and OH- is

ALOK_RAJ Asked Nov 28, 2023

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ALOK_RAJ Asked Nov 22, 2023

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The density of water at room temperature is 1.0 g/mL. How many molecules are there in a drop of water if its volume is 0.05 mL ?

ALOK_RAJ Asked Nov 22, 2023

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Chandan Asked Sep 13, 2023

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A large tank A of water is kept at a constant temperature $\theta_0$.conductor of length l, area of cross-section A and thermal conductivity K.

Chandan Asked Sep 13, 2023

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Aayush Asked Mar 1

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Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape?

Aayush Asked Mar 1

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Chandan Asked Oct 6, 2023

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Ammonia contains 82.35% of nitrogen and 17.65% hydrogen. Water contains 88.9% of oxygen and 11.1% of hydrogen. Nitrogen dioxide contains 63.15% of oxygen and 36.85% of nitrogen. Show by calculations from these data which law of chemical combination is verified.

Chandan Asked Oct 6, 2023

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ALOK_RAJ Asked Nov 28, 2023

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Amongst H2O, H2S, H2Se and H2Te, the one with the highest boiling point is

ALOK_RAJ Asked Nov 28, 2023

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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.

ALOK_RAJ Asked Nov 28, 2023

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Aayush Asked Feb 2

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If 6.3 g of NaHCO3 are added to 15.0 g of CH3COOH solution, the residue is found to weight 18.0 g. What is the mass of CO2 released in this reaction?

Aayush Asked Feb 2

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Aayush Asked Feb 2

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If 30 ml of H2 and 20 mL of O2 react to form water, what will be left at the end of the reaction?

Aayush Asked Feb 2

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Chandan Asked Oct 7, 2023

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Hydrogen peroxide and water contain 5.93% and 11.2% of hydrogen respectively. How this data illustrates the law of multiple proportions?

Chandan Asked Oct 7, 2023

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Aayush Asked Jan 4

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The dissociation energy of H2 is $103 \cdot 2 kcal mol ^{-1}$. A hydrogen molecule is irradiated with a photon of wavelength 2537Å.

Aayush Asked Jan 4

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Chandan Asked Sep 15, 2023

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For the elementary reaction $M \rightarrow N$, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is

Chandan Asked Sep 15, 2023

by Chandan

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Chandan Asked Aug 9, 2023

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Dissolving 120 g of urea (molar mass 60 ) in 990 g of water gave a solution of density 1.11 g / ml. Select the correct statements :

Chandan Asked Aug 9, 2023

by Chandan

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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?

ALOK_RAJ Asked Aug 3, 2023

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Chandan Asked Sep 29, 2023

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3.7g of an oxide of a metal was heated with charcoal. The liberated CO2 was absorbed in caustic soda solution and weighed 1.0g

Chandan Asked Sep 29, 2023

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Chandan Asked Aug 8, 2023

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40 mL of a mixture of CO and H2 yielded 15 mL of CO2 after explosion with an excess of O2. The percentage of CO in the mixture would be:

Chandan Asked Aug 8, 2023

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Chandan Asked Sep 22, 2023

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A mixture of 0.535g of ethanol and acetaldehyde when treated with a Fehling solution gave 1.2g of a red precipitate.

Chandan Asked Sep 22, 2023

by Chandan

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Aayush Asked Feb 1

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The density of water at $4^{\circ} C$ is $1 \times 10^{3} kg m ^{-3}$. Assuming no empty space to be present between water molecules, the volume occupied by one molecule of water is approximately :

Aayush Asked Feb 1

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Chandan Asked Sep 15, 2023

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The quantity of electricity required to liberate 112 cm^3 of hydrogen at STP from acidified water is —

Chandan Asked Sep 15, 2023

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Saurabh Kumar Verma Asked Apr 19, 2022

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The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298K is

Saurabh Kumar Verma Asked Apr 19, 2022

by Saurabh Kumar Verma

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AnjaliYadav Asked Sep 13, 2022

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A man moves from a place P to another place Q with a constant speed of 10 m / sec. and then he returns back to P again with the same constant speed along the same route. Calculate the average speed of the man.

AnjaliYadav Asked Sep 13, 2022

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