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5901.

Find the relation and fill up suitably Iron Haematite Aluminium: ………………...

Answer»


ANSWER :BAUXITE
Discussion
5902.

Find the pH of resultant solution when 100 mL of 0.005 M H_(2)SO_(4)" at " 25^(@)C is diluted to 100 mL. What is the amount of NaOH required to be dissolved in 500 mL to exactly neutralise the above solution ?

Answer»

Solution :(i) calculation of `H^(+)` ion CONCENTRATION in the diluted solution
(ii) calculation of the number of moles of hydrogen ions present in 100 mL of 0.005 M `H_(2)SO_(4)`
(iii) calculation of the concentration of the hydrogen ions of `H_(2)SO_(4)` solution after dilution
(IV) calculation of the number of moles of NAOH required to neutralise the above solution
(v) calculation of the amount of NaOH required
(VI) `4 XX 10^(-2) g`
Discussion
5903.

Find the pH of resultant solution when 100 mL of 0.005 M H_(2)SO_(4) " at " 25^(@)C is diluted to 1000 mL. What is the amount of NaOH required to be dissolved in 500 mL to exactly neutralise the above solution ?

Answer»

Solution :Normality of `H_(2)SO_(4)` = MOLARITY `xx 2 = 0.005 xx 2 = 0.01`
According to dilution law
`100 xx 0.01 = 1000 xx x`
`= (100 xx 0.01)/(1000) = 0.001 = 1 xx 10^(-3)`
`pH = - "log" 1xx 10^(-3) = 3`
If this solution neutralised by 500 ML of NaOH solution.
`100 xx 10^(-3) = 500 xx c`
`c = 2 xx 10^(-3)`
Amount of NaOH required
`2 xx 10^(-3) = (9x)/(40) xx (1000)/(500)`
`2 xx 10^(-3) xx 40//2= 4 xx 10^(-2) g`
Discussion
5904.

Find the period and group of the element whose atomic number is 12

Answer»

SOLUTION :3RD PERIOD, 2ND GROUP.
Discussion
5905.

Find the percentage of nitrogen in ammonia.

Answer»

SOLUTION :Ammonia `- NH_(3)="MOLAR mass"=14+3=17`
`"Mass % of Nitrogen"=(14)/(17)xx100`
`=82.35%`
Discussion
5906.

Find the odd one out.

Answer»

`""_(8)O^(16)`
`""_(8)O^(17)`
`""_(6)O^(12)`
`""_(8)O^(18)`

Solution :`""_(6)O^(12)`
Discussion
5907.

Find the Molar mass mass of SO_2

Answer»

32g
64g
16g
None

Answer :B
Discussion
5908.

Find the mass percentage composition of methane (CH_(4)).

Answer»

Solution :Molar mass of `CH_(4)=12+4`
`"Mass % of carbon"=(12)/(16)xx100`
`=75%`
`"Mass % of hydrogen"=(4)/(16)xx100`
`=25%`
Discussion
5909.

Find the mass of potassium chloride would be needed to form a saturated solution in 60 g of water at 303 K? Given that solubility of the KCl is 37/100 g at this temperature.

Answer»

SOLUTION :Mass of potassium CHLORIDE in 100 g of water in saturated solution = 37 g
37 Mass of potassium chloride in 60 g of water in saturated solution `= (37)/(100) xx 60 = 22.2 g `
Discussion
5910.

Find the mass of 2.5 mole of oxygen atoms.

Answer»

Solution :`"MASS"="ATOMIC mass"XX"NUMBER of moles"`
`"Mass of oxygen"=16xx2.5=40g`
Discussion
5911.

Find the how many moles of atoms are there in : (i) 2 g of nitrogen (ii) 23 g of sodium (iii) 40 g of calcium (iv) 1.4 g of lithium (v) 32 g of sulphur

Answer»

Solution :(i) 2G of nitrogen
`"Number of moles"=("Mass")/("atomic mass")`
`"Atomic mass of Nitrogen"=14,"Mass of Nitrogen"=2g`
`therefore " Number of moles "=(2)/(14)="0.142 moles of Nitrogen"`
(ii) 23 g of sodium
Atomic mass of sodium = 23
Mass of sodium = 23 g
`"Number of moles"=("Mass")/("atomic mass")=(23)/(23)=1" moles of calcium"`
(iv) 1.4 g of lithium
Atomic mass of lithium = 7
`"Number of moles"=("Mass")/("atomic mass")=(1.4)/(7)`
`=(2)/(1)=0.2" MOLE of lithium"`
(v ) 32 g of sulphur
Atomic mass of sulphur = 32
Mass of sulphur = 32g
`"Number of moles"=("Mass")/("atomic mass")=(32)/(32)="1 mole of sulphur"`
Discussion
5912.

Find the group number and period number of element having atomic number 52.

Answer»


Answer :Period = 5th , Group = 16 TH
Discussion
5913.

Find the gram molecular mass of the following from the data given : (i) H_(2)O (ii) CO_(2) (iii) NaOH (iv) NO_(2) (v) H_(2)SO_(4)

Answer»

Solution :
(i) `H_(2)O`
Molecular MASS of `H_(2)O`
`"Atomic mass of 2(H)"=2xx1=2`
`"Atomic mass of 1(O)"=1xx16={:(16),(ulbar(18)):}`
`therefore "Molecular mass of "H_(2)O=18g`
(ii) `CO_(2)`
`"Atomic mass of 1(C )"=1xx12=12`
`"Atomic mass of 2(O)"=2xx16={:(32),(ulbar(32)):}`
`therefore"Molecular mass of "CO_(2)=44g`
(iii) `NaOH`
`"Atomic mass of 1 (Na)"=1xx23=23`
`"Atomic mass of 1(O)"=1xx16=16`
`"Atomic mass of 1(H)"=1xx1={:(1),(ulbar(40)):}`
`therefore"Molecular mass of NaOH"=40g`
(IV) `NO_(2)`
`"Atomic mass of 1(N)"=1xx14=14`
`"Atomic mass of 2(O)"=2xx16={:(32),(ulbar(46)):}`
`therefore"Molecular mass of "NO_(2)=46g`
(v) `H_(2)SO_(4)`
`"Atomic mass of 2(H)"=2xx1=2`
`"Atomic mass of 1(S)"=1xx32=32`
`"Atomic mass of 4(C )"=4xx16={:(64),(ulbar(98)):}`
`therefore" Molecular mass of "H_(2)SO_(4)=98g`
Discussion
5914.

Find the concentration of solution in terms of weight percent if 20g of common salt is dissolved in 50g of water.

Answer»

Solution :Weightpercent`= (" weightof thesolute ")/(" weightof the solute+ Weightof THESOLVENT") xx 100`
Weightof thecommonsalt( solute ) = 20g
` THEREFORE ` Weightpercent `=( 20) /( 20+50 ) xx 100`
`=( 20 )/(70) xx 100 = 28.57 % `
`therefore` Weightpercent`= 28.57 %`
Discussion
5915.

Find the atomicity of ozone if its atomic mass is 16 and its molecular mass is 48.

Answer»

Solution :`"ATOMICITY"=("Molecular mass")/("Atomic mass")`
Atomicity of CHLORINE `=(48)/(16)=3`
Discussion
5916.

Find the atomicity of chlorine, if its atomic mass is 35.5 and its molecular mass is 71.

Answer»

Solution :`"Atomicity"=("Molecular MASS")/("ATOMIC mass")=(32)/(32)="1 MOLE of sulphur"`
Discussion
5917.

Find the atomic mass of O

Answer»

32g
64g
16g
None

Answer :C
Discussion
5918.

Findthe amountof urea whichis to be dissolvedin water to get500 gof 10 %w/waqueoussolution ?

Answer»

SOLUTION :Masspercentage( w/w )` = ("Massof thesolute ")/(" Mass of THESOLUTION ") xx 100`
`= 10 = ("Massofurea ")(" 500 ")xx 100`
Discussion
5919.

Find resemblance between hydrogen and alkali metals by writing compounds of both with chlorine, sulphur and oxygen.

Answer»

Solution :Alkali metals are: Li, Na, K, RB, CS, Fr.
`H_2O,Na_2O,H_2S,Na_2S,HCl,NaCl`
Hydrogen and alkali metals form similar formulae with OXYGEN, sulphur and chlorine.
Discussion
5920.

Find out the valencies of the first twenty elements .

Answer»

SOLUTION :
Discussion
5921.

Find out the homogeneous mixture

Answer»

SALT + WATER
SAND + Water
Clay + Water
GOLD + Water

SOLUTION :Salt + Water
Discussion
5922.

Find out the hetero diatomic molecule?

Answer»

HYDROGEN
Hydrogen CHLORIDE
Methane
Ammonia

Solution :Hydrogen chloride
Discussion
5923.

Fill in the missing data in the following table.

Answer»

SOLUTION :The COMPLETE table is GIVEN as under. :
Discussion
5924.

Fill in the missing data in the reactions table :

Answer»

SOLUTION :
Discussion
5925.

Fill in the blanks using the given data : The formula of Calcium oxide is CaO. The atomic mass of Ca is 40, Oxygen is 16 and Carbon is 12. (i) 1 mole of Ca (……..g) and 1 mole of Oxygen atom (………g) combine to form …………. Mole of CaO (…….g). (ii) 1 mole of Ca (.........g) and 1 mole of C (.....g) and 3 moles of Oxygen atom (.........g) combine to form 1 mole of CaCO_(3) (..........g)

Answer»

Solution :(i) 1 mole of `Ca (UL(40g))` and 1 mole of Oxygen atom `(ul(16g))` COMBINE to FORM `ul1`Mole of `CaO (ul(56g))`.
(ii) 1 mole of `Ca (ul(40g))` and 1 mole of `C (ul(12G))` and 3 moles of Oxygen atom `(ul(48G))` combine to form 1 mole of `CaCO_(3) (ul(100g))`
Discussion
5926.

Fill in the blanks by using the correct word/term given in the brackets. The pH of water decreases when _____ is dissolved in it. (NH_(3)//SO_(2))

Answer»

SOLUTION :`SO_(2)`
Discussion
5927.

Fill in the blanks by using the correct word/term given in the brackets. The acid present in vinegar is _______ . (HCl//CH_(3)COOH)

Answer»

SOLUTION :`CH_(3)COOH`
Discussion
5928.

Fill in the blanks by using the correct word/term given in the brackets. HCl(aq) is a monoprotic acid. Therefore, CH_(3)COOH (aq) is a ________ acid. (monoprotic/tetraprotic)

Answer»

SOLUTION :MONOPROTIC
Discussion
5929.

Fill in the blanks by using the correct word/term given in the brackets. An acid _____ change the colour of phenolphthalein. (must/does not)

Answer»

SOLUTION :does not
Discussion
5930.

Fill in the blanks by using the correct word/term given in the brackets. An acid produces _____ ions in aqueous solution. (hydrogen/hydroxide)

Answer»

SOLUTION :HYDROGEN
Discussion
5931.

Fill in the blanks by using the correct word/term given in the bracket and rewrite the complete sentence in your notebook: A water soluble base produces ____ ions in solution. (H^(+)//OH^(-))

Answer»

SOLUTION :`OH^(-)`
Discussion
5932.

Fill in the blanks by using the correct word/term given in the bracket and rewrite the complete sentence in your notebook: The reaction between an acid and a base is called ______ reaction. (oxidation/neutralisation)

Answer»

SOLUTION :NEUTRALISATION
Discussion
5933.

Fill in the blanks by selecting correct word/term given in the brackets. Froth floatation process is used to concentrate __________ ores. (oxide/sulphide)

Answer»

SOLUTION :SULPHIDE
Discussion
5934.

FeS_(2) is converted intoFe_(2)O_(3) according to the following equation4FeS_(2) +xO_(2) to 2Fe_(2)O_(3) + ySO_(2) x and y used in the equation have the values .

Answer»

10 and 8
11 and 8
5 and 4
6 and 7

Answer :B
Discussion
5935.

Ferrous sulphte decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Answer»

Solution :`2FeSO_(4)(s)overset("Heat")rarrFe_(2)O_(3)(s)+SO_(2)(g)+SO_(3)(g)`
It is a thermal decomposition REACTION.
Discussion
5936.

Ferrous sulphate on heating gives ferric oxide. Two gases that accompany the reaction are

Answer»

`SO_(2)+O_(2)`
`SO_(2)+SO_(3)`
`SO_(3)+O_(2)`
`SO_(2)+N_(2)`

SOLUTION :The GASES evolved are `SO_(2)` and `SO_(3)`.
`2FeSO_(4)overset("Heat")(to)Fe_(2)O_(3)+SO_(2)+SO_(3)`
Discussion
5937.

Ferrous sulphate crystals (FeSO_(4).7H_(2)O) on heating lose water of crystallisation parlially and change to FeSO_(4).5H_(2)O.

Answer»

Solution :FERROUS dulphate crystals on HEATING DECOMPOSE to `Fe_(2)O_(3)+SO_(2)+SO_(3)`.
Discussion
5938.

Ferrous sulphate crystals are taken in a test tube and heated, the correct statement related to this chemical reaction is

Answer»

This is a photolytic DECOMPOSITION reaction, and white COLOURED soild FERRIC oxide is formed
This is a THERMAL decomposition and green coloured fumes of ferric oxide is formed
This is a thermal decomposition reaction and brown coloured fumes of ferric oxide is formed
This is a thermal decomposition reaction and brown coloured SOLID ferric oxide is formed

Solution :This is a thermal decomposition reaction and brown coloured solid ferric oxide is formed
Discussion
5939.

Ferric chloride is an example of .....

Answer»

SOLUTION :DELIQUESCENT SUBSTANCES
Discussion
5940.

FeCl_2 and FeCl_3 are two different chlorides of iron. [Hint : Atomic Number of Fe = 26 Oxidation state of CI = (-1) Find the oxidations state of Fe in FeCl_2.

Answer»


ANSWER :`+2`
Discussion
5941.

Fe_2O_3, Fe_3O_4, FeS_2, Cu_2 O

Answer»

SOLUTION :`Cu_2O `
Discussion
5942.

Fe_(2)O_(3)+2AlrarrAl_(2)O_(3)+2Fe The above reaction is an example of

Answer»

COMBINATION REACTION
double displacement reaction
decomposition reaction
displacement reaction

Solution :The given equation is a displacement reaction in which Fe of `Fe_(2)O_(3)` has been DISPLACED by Al.
Discussion
5943.

Fe2O3+2Al toAl2O3+2Fe. This reaction is a

Answer»

combination reaction
DOUBLE DECOMPOSITION
decomposition reaction
DISPLACEMENT reaction

ANSWER :D
Discussion
5944.

Fe_(2)O_(3)+2Al to Al_(2)O_(3)+2Fe The above reaction is an example of a

Answer»

combination REACTION.
double displacement reaction.
DECOMPOSITION reaction.
displacement reaction.

Solution :The is an EXAMPLE of displacement reaction because Fe in `Fe_(2)O_(3)` has been displaced by Al. Thus, the correct ANSWER is (d).
Discussion
5945.

Fe_(2)O_(3) + 2Al to Al_(2)O_(3) + 2Fe The above reaction is an example of a ….

Answer»

COMBINATION REACTION.
double DISPLACEMENT reaction.
DECOMPOSITION reaction.
displacement reaction,

SOLUTION :displacement reaction,
Discussion
5946.

Fe_(2)O_(3)+2Al to Al_(2)O_(3)+2Fe. The above reaction is an example of a

Answer»

COMBINATION reaction
double - DISPLACEMENT reaction
DECOMPOSITION reaction
displacement reaction

ANSWER :D
Discussion
5947.

Fe_(2)O_(3)+2Al to Al_(2)O_(3)+2Fe The type of above chemical reaction is

Answer»

COMBINATION REACTION
DOUBLE DISPLACEMENT reaction
decomposition reaction
displacement reaction.

ANSWER :D
Discussion
5948.

Fe_2 (SO_2)_3 solution will

Answer»

turn blue litmus red
turn red litmus blue
turn phenolphthalein solution pink
both (b) and (C)

Solution :`Fe_2 (SO_4)_3` is an acidic salt. It is a slat of WEAK base `FE(OH)_2` and strong acid `H_2 SO_4` Hence, aqueous solution of this salt TURNS blue litmus red.
Discussion
5949.

Fe reacts with dilute nitric acid in cold condition to give ……………… .

Answer»

FERROUS ntiride
Ferrous NITRATE
FERRIC nitirde
Ferric nitrate

ANSWER :B
Discussion
5950.

Fe: Electropositive :: Cl: __________

Answer»

Solution :Electronegative- Fe has a tendency to forma cation by losing its valence ELECTRONS and ITIS called electropositive PROPERTY whereas Clhas a tendency to gain ELECTRON and it is calledelectronegative property .
Discussion