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In an ecosystem, the 10% energy available for transfer from one trophic level to the next is in the form of

In an apparatus, 16.8 g of sodium bicarbonate was subjected to heating till it underwent complete decomposition, what is the expected loss in weight? When thesame apparatus was fitted to a condenser, theloss in weight was different from theearlier loss in weight. Justify the difference.

In addition to sodium hydrogencarbonate, bakings powder contains a substance 'X'. Name the substance 'X'.

In acetylene, there are _________covalent bonds.

In a voltaic cell, if iron and silver electrodes are connected with each other then current flow

In a triad of three elements A, B, and C, the atomic mass of A and B are 80 and 120 respectively. Find the atomic mass of element C.

In a test-tube, hydrochloric acid is poured over a few zinc granules. List two observations that suggest that a chemical reaction has occurred. 2HCl+ZnrarrZnCl_(2)+H

In a solution with pH 6 acidic, basic or neutral ? Justify

In a solution the component which is present in lesser amount is called solvent

In a solution the component which is present in a larger amount is called

In a solution, the component present in lesser amount by weight is called ...... and in a large amount by weight is called ........

In a__________ reaction, a singlecompoundsplitsintotwoor moresimpler substancesundersuitableconditions .

In a reaction 6.0g of sodium carbonate were reacted with 10g of hydrochloric acid solution. The product was a mixture of 4.5g of carbon dioxide and 11.5g of sodium chloride solution. This data in agreement with the law of

In a process 701 J of heat is absorbed by a system and 394 J work is done by the system. What is the change in internal energy for the process?

In a power station coal is burnt to heat water to produce steam which further runs the turbine to generate electricity. This power station is a

In a period , the metallic character of the element increases while their non mtallic character decreases

In a period from left to right , the matallic character of elements _____ and nonmetallic character _____

In a Particular transition series, the atomic radius reaches minimum up to group VIII elements, then again increases towards the end of the series. Give appropriate reasons.

In a molecule of saturated hydrocarbon, the number of C atoms is 5. What is the number of H atoms and what is the formula of the compound?

In a molecule of saturated hydrocarbon, the number of H atoms is 16, what is the number of atoms and what is the name of this molecule?

In a homologous series, the successive compounds differ by a………………….group.

State true or false: In a group, the valency of each element is the same.

In a group, the atomic size_________ from top to bottom. (increases / decreases).

In a period if the atomic radius of the first element is 152 pm, what is the atomic radius of the third element-more than or less than 152 pm?

In a Dobereiner's triad consisting of three elements A, B, and C, the sum of atomic masses of A and B is 115 and the average of atomic masses A and C is 81. Find the atomic mass of A, B, and C. Predict the names of these elements.

In a Daniel cells, if A (E_(0) = -0.76 ) and B(= - 2.36 V) half - cells are taken then

In a compound C_(x)H_(y)O_(z) , the mass % of C and H is 6:1 and the amount of oxygen present is equal to the half of the oxygen required to react completely C_(x)H_(y). Find the empirical formula of the compound.

In a combination reaction?

In a combination reaction, only two substances can combine to form a new single substance.

In a combination reaction two elements combine to form a compound .

In a chemicalreaction , thenumber of atomsof reactantsand thatof theproducts mustbe equal .

In a chemicalreaction , theatoms of thereactingmoleculesor elements are _________toformnewmolecules .

In a bakery, baking powder was not added while preparing cake. The cake obtained was hard and small in size . What is the reason for this.

In a 2.5 L flask at 27^(@)C temperature, thepressure of a gas was found to be8 atm. If41 xx 10^(23) molecules of thesame gas are introduced into thecontainer, thetemperature changed toT_(2).Thepressure of gas is found to be 10 atm. Find out thevalue ofT_(2).

The number of the ways in which 5 girls and 3 boys can be seated in a row so that no two boys are together is

Illustrate the formation of bond in : (i) Sodium chloride (ii) Magnesium chloride. Identify the ions present in these compounds.

Illustrate an activity along with a labelled diagram, to show that a change in the state of matter and change in temperature takes place during a chemical reaction.

Illustrate any three chemical properties of acids with examples.

{:(i.H_(2)O,(a)16),(ii.CO_(2),(b)18),(iii. C_(6)H_(12)O_(6),(c)44),(iv.CH_(4),(d)180):}

{:(i.,"Functional group -OH",a.,"Benzene"),(ii.,"Heterocyclic",b.,"Potassium stearate"),(iii.,"Unsaturated",c.,"Alcohol"),(iv.,"soap",d.,"furan"),(v.,"Carbocylic",e.,"Ethene"):}

If you look at the modern periodic table, you will find that the elemenets Li, Be, B, C, N, O, F F and Ne are present in the second period. Write down their electronic configurations.

If you look at the long form of the Periodic Table, you will find that the elements Li, Be, B, C, N, O, F, and Ne are present in the second period. Write down their electronic configuration .

If you collect silver coins and copper coins, after some days a black coating on silver coins and a green coating on copper coins appear. Which chemical phenomenon is responsible for these coatings? Write the chemical name of these black and green coatings.

If we open a bottle of perfume, its smell spreads in the entire room with in a short time due to the process of

If we do not add a few drops of H_(2)SO_(4) to water, its electrolysis does not take place.

In a period from left to right , the matallic character of elements _ and nonmetallic character _