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Which of the following statement is incorrect?

(a) all green plants and blue-green algae are producers

(b) green plants get their food from readymade organic compounds

(c) producers prepare their own food from inorganic compounds

(d) plants convert solar energy into chemical energy

Which is more basic (or more alkaline) : a solution of pH = 8 or a solution of pH = 11 ?

What is delocalisation?

Explain why alkanes are excellent fuels.

(a) Concentrated nitric acid oxidises phosphorus to phosphhoric acid according to the following equation;
$P+5HN{O}_3(conc.)\to H_{3}P{O}_4+H_{2}O+5N{O}_2$
If 9.3 g of phosphorus was used in the reaction, calculate;
(i) Number of mles of phosphorus take.
(ii) The mass of phosphoric acid formed.
(iii) The volume of nitrogen dioxide produced at STP.
(b) (i) 67.2 Litres of hydrogen combines with 44.8 letres of nitrogen to form ammonia under specific conditions as:
N_2(g) +3H_2(g) \rightarrow 2NH_3(g)
Calculate the volume of ammonia produced.
What is the other substance, if any that remains in the resultant mixture?
(ii) The mass of $5.6d{m}^3$ of a certain gas at STP is 12.0 g. Calculate the relative molecular mass of the gas.
(iii) Find the total percentage of Magnesium in magnisum nitrate crystals, $Mg(N{O}_3{)}_2.6H_{2}O.$
$[Mg=24,N=14,O=16andH=1]$

Tell me all colours of chemical solutions like H2SO4, NASO4 etc. With their chemical formula

What type of reactions are represented by the following equations

(a)$CaO+C{O}_2⟶CaC{O}_3$

(b)$2Na+2H_{2}O⟶2NaOH+H_2$

(c)$Mg+CuS{O}_4⟶MgS{O}_4+Cu$

(d)$N{H}_{4}N{O}_2⟶N_2+2H_{2}O$

(e)$CuS{O}_4+2NaOH⟶Cu(OH{)}_2+N{a}_{2}S{O}_4$

Based on their basicity, acids are classified as:

____ is the ore of aluminium which contains a metallic element present in group IA of the periodic table.

Explain me about every types of reaction with help of examples

Which of the following is not a combustion reaction?

The first ionisation enthalpies (kj/mol)for Li ,Be ,B and C have one of the following values. Which of these corresponds to that of boron ?

Select the correct statement regarding covalent bond:

State one industrial application of reduction process.

Balancing complicated equations

Moist hydrogen gas combines with chlorine to form____.

In both I and VII group of the periodic table which of the following property increases with increase in atomic number?

Q12)Statements:

Some towels are brushes.

No brush is soap.

All soaps are rats.

Conclusions:

I. Some rats are brushes.

II. No rat is brush.

III. Some towels are soaps.

Elements Q and S react together to form an ionic compound. Can Q and S both be metals? Justify your answer.

A zinc plate was kept in a glass container having $CuS{O}_4$ solution. On examining it was found that the blue colour of the solution is getting lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.

Write the structures of the following compounds:

(a) Prop-l-ene,

(b) 2, 3-dimethylbutane,

(c) 2-methylpropane

(d) 3-hexene

(e) Prop-l-yne

(f) 2-methylprop-1-ene

(g) Alcohol with molecular formula $C_4{H}_{10}O$.

What is modern periodic table? What is its composition

Vinay was trying to create sodium acetate, he added ethanoic acid and ‘A’ in an open vessel to concentrated $H_{2}S{O}_4$ and was surprised when the solution gave a sweet effervescence. So he started again in a closed vessel and obtained ethyl acetate. Then he added ‘B’ and created sodium acetate. Find A and B.

Why is non biodegradable waste more harmful than biodegradable waste?

The solubility of solid solutes depends on temperature. As temperature increases,

The acidic character in acetic acid is due to the presence of replaceable______atom in the carboxylic group.

What is an oxidation reaction? Identify the following in the given reaction:
(i) the substance oxidised (ii) the substance reduced.
$ZnO+C\to Zn+CO$

An organic compound having the molecular formula $C_3{H}_{6}O$ can exist in the form of two isomers A and B having different functional groups. The isomer A is a liquid which is used as a solvent for nail polish. The isomer B is also a liquid. An aqueous solution of one of the lower homologues of B is used for preserving biological specimens in the laboratory
(a) What is compound A?
(b) Write the electron-dot structure of A.
(c) What is compound B?
(d) Write the electron-dot structure of B.
(e) Name the lower homologue of compound B which is used in preserving biological specimens.

How does tooth enamel get damaged? What should be done to prevent it?

Write balanced chemical equations for the following:

NaCl is heated with sulphuric acid in the presence of $Mn{O}_2$.

Chlorine gas is passed into a solution of Nal in water.

Give balanced equations with conditions,if any for the following conversions A to D.

A.Sodium Chloride to Hydrogen Chloride

B.Hydrogen Chloride to Iron [||] sulphide

C.Hydrogen chloride to ammonium chloride

D.Hydrogen Chloride to Lead chloride

It is said that aqua regia can dissolve or corrode highly unreactive

Metals like gold and platinum.

Then how it is stored? In which container?

Why is the chemical formula of iron oxide Fe₃O₄ when the valency of iron is 2,3 and that of oxygen is 2

What are micelles and 3 diffrence between soaps and detergents

Why if a substance loses hydrogen is said to be oxidised and if gains Hydrogen then reduced?

The molecular mass of $H_{2}S{O}_4$ is :

what is a decomposition reaction ? Give an example of a decomposition reaction. Desctribe an activity illustrate such a reaction by heating.

What happens when solid iron piece is kept with cuso4 crystals ?Does any reaction takes place ? Guess the reason ??

Ethanol on complete oxidation gives:

Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

(c) The third crystalline form of carbon.