A pure substance which contains only are type of atoms is called —

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ALOK_RAJ Asked Jan 2

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ALOK_RAJ Asked Nov 18, 2023

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A pure substance can only be —

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Chandan Asked Sep 13, 2023

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Explain why cations are smaller and anions larger in radii than their parent atoms?

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The mutation of the type in which a part or the complete gene is removed from the genome is called

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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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Aayush Asked Feb 1

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Caffeine has a molecular weight of 194 . It contains about 30% by mass of nitrogen. The number of atoms of nitrogen in one molecule of it is :

Aayush Asked Feb 1

by Aayush

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ALOK_RAJ Asked Dec 20, 2023

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Which of the following contains the same number of atoms as 6g of magnesium?

ALOK_RAJ Asked Dec 20, 2023

by ALOK_RAJ

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AnjaliYadav Asked Oct 9, 2022

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The element X and Y form a compound which contains the element in ratio of 1: 3 by mass. If their vapor density are in ratio of 2: 3 find empirical formula of compound.

AnjaliYadav Asked Oct 9, 2022

by AnjaliYadav

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1 Vote

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Aayush Asked Feb 1

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An organic compound on analysis was found to contain 0.032% of Sulphur by mass. The molecular mass of the compound, if its one molecule contains two Sulphur atoms, is :

Aayush Asked Feb 1

by Aayush

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ALOK_RAJ Asked Nov 27, 2023

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Write two polymers in each case which are (a) thermoplastic type (b) used as fibres.

ALOK_RAJ Asked Nov 27, 2023

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Aayush Asked Feb 2

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0.05 mole of LiAIH4 in ether solution was placed in a flask containing 74g (1 mole) of t-butyl alcohol. The product LiAIHC12H27O3 weighed 12.7 g. If Li atoms are conserved, the percentage yield is —

Aayush Asked Feb 2

by Aayush

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ALOK_RAJ Asked Aug 3, 2023

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A compound contains carbon and chlorine. The percentage of chlorine in the compound is 92.21. In another compound which contains carbon and sulphur, the percentage of sulphur is 84.21. In a third compound which contains Sulphur and chlorine, the percentage of chlorine is 52.59.

ALOK_RAJ Asked Aug 3, 2023

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test Asked Jun 8, 2022

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A compound contains equal masses of the elements A, B and C if the atomic weights of A, B and C are 20, 40 and 60 respectively. The empirical formula of the compound is

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ANAND_YADAV Asked Jul 30, 2023

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100 mL of sulphuric acid solution (sp. gr. $=1.84$ ) contains 98% by weight of pure acid. Calculate the volume of 0.46M NaOH solution (in L) required to just neutralize the above acid solution.

ANAND_YADAV Asked Jul 30, 2023

by ANAND_YADAV

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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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Aayush Asked Jan 30

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A person adds 1.71 gram of sugar in order to sweeten his tea. The number of carbon atoms added are —

Aayush Asked Jan 30

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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

by ALOK_RAJ

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AnjaliYadav Asked May 2, 2022

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A gas of identical hydrogen-like atoms has some atoms in the lowest (ground) energy level A and some atoms in a particular upper (excited energy level B and there are no atoms in any other energy level.

AnjaliYadav Asked May 2, 2022

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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

by ALOK_RAJ

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ALOK_RAJ Asked Nov 27, 2023

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Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the structural similarities between such polymers?

ALOK_RAJ Asked Nov 27, 2023

by ALOK_RAJ

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ALOK_RAJ Asked Nov 27, 2023

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Which type of biomolecules have some structural similarity with synthetic polyamides? What is this similarity?

ALOK_RAJ Asked Nov 27, 2023

by ALOK_RAJ

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Shakti Asked Dec 20, 2021

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Sulphur exist in different allotropic forms like S2, S6 and S8 etc. If equal moles of these three forms are taken in separate containers, then the ratio of number of atoms present in them respectively is

Shakti Asked Dec 20, 2021

by Shakti

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Dev Yaduvanshi Asked Aug 12, 2023

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Which type of common allergic diseases are generally found in children of 0-6 years of age?

Dev Yaduvanshi Asked Aug 12, 2023

by Dev Yaduvanshi

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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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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

by Chandan

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ALOK_RAJ Asked Apr 3, 2021

127 views

Potassium sulphate is isomorphous with potassium chromate which contains 26.79 % by weight of chromium.

ALOK_RAJ Asked Apr 3, 2021

by ALOK_RAJ

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8 Votes

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Aayush Asked Jan 2

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A column which is uniquely identifies the rows of a table is called a

Aayush Asked Jan 2

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ANAND_YADAV Asked Jul 30, 2023

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The wave, which travels in a strength line and cannot bend around the corner is called transverse wave. Which one of the following is an example of transverse wave?

ANAND_YADAV Asked Jul 30, 2023

by ANAND_YADAV

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Aayush Asked Feb 22

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The vapor pressures of benzene, toluene and a xylene are 75 Torr, 22 Torr and 10 Torr at 20°C. Which of the following is not a possible value of the vapor pressure of an equimolar binary/ternary solution of these at 20°C? Assume all form ideal solution with each other.

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Aayush Asked Jan 30

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Which of the following methods of expressing concentration of a solution is/are independent of temperature?

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ALOK_RAJ Asked Nov 28, 2023

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Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn blue?

ALOK_RAJ Asked Nov 28, 2023

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Chandan Asked Sep 12, 2023

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100 mL of air containing only oxygen and nitrogen is taken in a jar over water. NO is slowly passed till more brown fumes appear in the gas jar. It is found that 42 mL of NO is required. The percentage nitrogen in the air would be:

Chandan Asked Sep 12, 2023

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Chandan Asked Aug 18, 2023

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The substances to which an immune response is produced are called —

Chandan Asked Aug 18, 2023

by Chandan

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ALOK_RAJ Asked Dec 20, 2023

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A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 4 by weight. The ratio of number of molecules of oxygen and nitrogen is :

ALOK_RAJ Asked Dec 20, 2023

by ALOK_RAJ

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ALOK_RAJ Asked Nov 19, 2023

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A certain volume of nitrogen contains 3000 molecules at $30^{\circ} C$. How many molecules will it contain if it is heated to $100^{\circ} C$ and the pressure remains the same?

ALOK_RAJ Asked Nov 19, 2023

by ALOK_RAJ

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Chandan Asked Sep 29, 2023

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The vapour density of a chloride of a metal is 81.5 (H=1) and the chloride contains 34.46 % metal. The specific heat of the metal is 0.115. Calculate the exact atomic weight and molecular formula of chloride.

Chandan Asked Sep 29, 2023

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