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3901.

Observe the given figure and answer the following questions. (a) Write the complete balanced reaction for the reaction that takes place. (b) Type of reaction involved. (c) Is there any precipitate formed. (d) If any precipitate formed, write the colour of the precipitate.

Answer»

Solution :(a) `BaCl_(2)(AQ) + Na_(2)SO_(4)(aq) to underset("(WHITE ppt.)")(BaSO_(4)(s)) + 2NaCl(aq)`
(b) It is a double displacement reaction
(c) Yes, a precipitate of barium sulphate is formed.
(d) The precipitate is white in colour.
Discussion
3902.

Observe the given figure and answer the following question : Write the complete balanced reaction.

Answer»

Solution :The COMPLETE balanced equation is
`Na_(2)SO_(4)(aq)+BaCl_(2)(aq)toBaSO_(4)(s)+2NaCl(aq)`
Discussion
3903.

Observe the given figure. Name the eye defect indicated in the figue snd also mention the lens used to correct this defect.

Answer»

SOLUTION :MYOPIA
CONCAVE LENS
Discussion
3904.

Observe the given figure and answer the following question : Is there any precipitate formed ?

Answer»

Solution :A PRECIPITATE of barium SULPHATE, `BaSO_(4)` is FORMED in the reaction.
Discussion
3905.

Observe the given figure and answer the following question : What is the type of reaction involved ?

Answer»

SOLUTION :It is a DOUBLE DISPLACEMENT REACTION.
Discussion
3906.

Observe the given figure and answer the following question : If any precipitate is formed, write the colour of the precipitate.

Answer»

SOLUTION :COLOUR of the PRECIPITATE FORMED is WHITE.
Discussion
3907.

Observe the given chemical change and answer the following: (i)Identify 'A' and 'B'. (ii)Write the commercial name of calcium hydroxide. (iii)Identify products 'C' and 'D' ,When HCl is allowed to react with calcium oxide. (iv)Say whether calcium oxide is acidic or basic.

Answer»

Solution :
(i)A is CALCIUM carbonate.B us carbon -di-oxide.
(ii)Slaked lime is the commercial name of calciumhydroxide.
(iii)The products C and D are calcium chloride `(CaCl_(2))` and water `(H_(2)O)`
(iv)Calcium oxide is basic in NATURE.
Discussion
3908.

Observe the following set up : (a) Which of the bulb glows ? (b) Give reason for each of the case. (c ) What would be the change observed if the content of the beaker B is replaced by NaOH solution ?

Answer»

Solution :(a) Bolb C
(b) Glucose and ALCOHOL do not dissociate ions when dissolved in water as they are covalent compounds. As there is no movement of ions, BULB does not glow. HCl being an acid, releases `H^(+)` when dissolved in water thereby helps in conducting ELECTRICITY. Hence the bulb glows.
(c ) If beaker B is replaced by NaOH solution, the bulb glows. This is because NaOH being a base, releases OH - ions to the solution which conducts electricity.
Discussion
3909.

Observe the following chemical reactions i) Fe_2O_3 + 2Alto 2Fe + Al_2O_3 ii) ZnO + C to Zn + CO iii) Fe_2O_3 + 3C to 2Fe + CO iv) Al_2O_3 + 3C to 2Al + 3CO Which of the above reaction is wrong? How is the metal present in the wrong equation extracted? Which of the above reaction can be used to join the broken parts of the machines. Why?

Answer»

Solution :Wrong reaction is (IV) It is EXTRACTED by electrolysis (i) is used to join broken PARTS
`because`It is EXOTHERMIC. Fe is in LIQUID state.
Discussion
3910.

Observe the following chemical equations : (i) Al_(2)O_(3) + 2NaOH rarr 2NaAlO_(2) + H_(2)O (ii) Al_(2)O_(3) + 6HCl rarr 2AlCl_(3) + 3H_(2)O What is the conclusion that you take about the nature of aluminium oxide with the help of these equations. Give reason for your conclusion.

Answer»

Solution :ALUMINIUM OXIDE is amphoteric in nature.
Aluminium oxide is reacting with BASE in the first equation to give salt & WATER.
Hece, it is an amphoteric oxide.
Discussion
3911.

Observe the following chemical equations andidentify the correct statement. (i) CuSO_(4) + Fe rarr FeSO_(4) + Cu (ii) 2AgNO_(3) + Cu rarr Cu(NO_(3))_(2) + 2Ag

Answer»

COPPER is more REACTIVE than IRON and SILVER
Iron is LESS reactive than Copper and Silver
Copper is more reactive than Silver but less reactive than Iron
Silver is more reactive than Copper and Iron

Solution :Copper is more reactive than Silver but less reactive than Iron
Discussion
3912.

Observe the diagram. (i) Which is concentrated solution and why?(ii) Which is dilute solution and why?

Answer»

SOLUTION :(i) Flask (b ) is concentrated solution. Because (b) flask CONTAINS LARGE number of solute PARTICLES than (a) flask.
(i) Flask (a) is dilute solution. Because (a) flask contains lesser number of solute particles than (b) flask.
Discussion
3913.

O_(2),N_(2),Cl_(2),Br_(2),F_(2),I_(2) are hetero diatomic molecules.

Answer»

<BR>

Solution :Correct statement : `O_(2),N_(2),Cl_(2),Br_(2),F_(2),I_(2)` are HOMO diatomic MOLECULES.
Discussion
3914.

Write True/False: O_(2)^(+) has oxidation state of oxygen as +1//2.

Answer»


ANSWER :T
Discussion
3915.

Numberof water molecules as water of crystallisation present in Gypsum

Answer»

2
4
5
`1/2`

SOLUTION :`1/2`
Discussion
3916.

Number of moles of water in 1 L of water with density 1 g/cc are

Answer»

55.56
45.56
56.55
5.655

Answer :A
Discussion
3917.

Number of carbon atoms present in 18 g of glucose ( C_(6)H_(12)O_(6))

Answer»


ANSWER :`3.61xx10^(23)`
Discussion
3918.

Number of atoms which a molecule to sulphur contains is ……….. .

Answer»

3
8
4
2

Solution :`(S_(8))`
Discussion
3919.

Number of atoms of oxygen in 24 g of O_(3) is _____________

Answer»


ANSWER :`9.033xx10^(23)`
Discussion
3920.

Number of atoms of He in 100 atoms of He (at.mass 4 amu) is

Answer»

25
50
100
400

Answer :A
Discussion
3921.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Moseley showed that atomic number is a more fundamental property than atomic mass. Reason (R) : Atoms of the same element having the same atomic number but different atomic masses are called isotopes.

Answer»

Both (A) and (R) are TRUE and (R ) is correct EXPLANATION of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is false.
(A) is false but (R ) is true.

Answer :B
Discussion
3922.

Note the change in colour when a blue litmus paper is dipped in an aqueous solution of sodium hydroxide.

Answer»

SOLUTION :No CHANGE in COLOUR.
Discussion
3923.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : There is an anomaly in the position of hydrogen in the Periodic Table. Reason (R) : The elements Al, Si and P belong to the fourth period in the Periodic Table.

Answer»

Both (A) and (R) are true and (R ) is correct EXPLANATION of the ASSERTION.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is false.
(A) is false but (R ) is true.

Answer :C
Discussion
3924.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Boron, silicon and germanium are metalloids. Reason (R) : The position of an element in the Periodic Table tells us about its reactivity.

Answer»

Both (A) and (R) are true and (R ) is CORRECT EXPLANATION of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is false.
(A) is false but (R ) is true.

Answer :B
Discussion
3925.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Non-metals like sulphur and chlorine are located on the left-hand side of the Periodic Table. Reason (R ) : Atomic radius decreases in moving from left to right in a period.

Answer»

Both (A) and (R) are TRUE and (R ) is CORRECT explanation of the ASSERTION.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :D
Discussion
3926.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Metallic character increases down the group. Reason (R ) : Elements in the Periodic Table are arranged in six horizontal rows called periods.

Answer»

Both (A) and (R) are TRUE and (R ) is correct EXPLANATION of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :C
Discussion
3927.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Atomic size increases down the group in the Periodic Table. Reason (R ) : New shells are being added as we go down the group.

Answer»

Both (A) and (R) are TRUE and (R ) is correct explanation of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :A
Discussion
3928.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : There are 18 elements in the sixth period of Periodic Table. Reason (R ) :Modem Periodic Law was given by Moseley.

Answer»

Both (A) and (R) are TRUE and (R ) is correct explanation of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :D
Discussion
3929.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Atomic radius decreases in moving from left to right in the Periodic Table. Reason (R ) : As we move from L.H.S. to R.H.S., the nuclear charge increases which tends to pull the electrons closer to the nucleus.

Answer»

Both (A) and (R) are TRUE and (R ) is correct EXPLANATION of the ASSERTION.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :A
Discussion
3930.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Metalloids have properties intermediate between the metals and non-metals. Reason (R ) : Newlands gave the Law of Triads.

Answer»

Both (A) and (R) are TRUE and (R ) is correct EXPLANATION of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :C
Discussion
3931.

Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Position of an element in the Periodic Table tells us about its chemical reactivity. Reason (R ) : There are 18 elements in the fourth table.

Answer»

Both (A) and (R) are true and (R ) is CORRECT EXPLANATION of the assertion.
Both (A) and (R ) are true but (R ) is explanation of the assertion.
(A) is true but (R ) is FALSE.
(A) is false but (R ) is true.

Answer :B
Discussion
3932.

Normal Elements

Answer»

SOLUTION :The elements in which only last shell isincompletely FILLED are CALLED as normal elements.
Discussion
3933.

Non-metals usually form

Answer»

ACIDIC OXIDES
BASIC oxides
NEUTRAL oxides
Both acidic and basic oxides

Answer :A
Discussion
3934.

Non-metals tend to form bonds with other atoms by gaining electrons.

Answer»

SOLUTION :TRUE - Non-metals FORM ELECTROVALENT BONDS.
Discussion
3935.

Non-metals from

Answer»

IONIC halides
COVALENT halides
coordinate halides
none of the above

Answer :B
Discussion
3936.

Non-metals in the third period.

Answer»

SOLUTION :PHOSPHORUS, SULPHUR, CHLORINE and ARGON.
Discussion
3937.

Non-metals are bad conductors of electricity, except for __ which is a good conductor ofelectricity.

Answer»

SOLUTION :GRAPHITE
Discussion
3938.

Non-metals are formed on the ____ of the Periodic Table towards the ___ ______.

Answer»

SOLUTION :RIGHT HAND SIDE, TOP
Discussion
3939.

"Noblegases have zero electron affinity " . Say True and Falseand Justify your answer .

Answer»

SOLUTION :(i) True.
(II) Noble gases show no tendency to accept electrons because the outers and p ORBITALS of noble gases are completely filled .
(iii) No moreelectron can be ADDED to them and hence their electron affinities are ZERO.
Discussion
3940.

Noble gases has ……….. Eelectronaffinity .

Answer»

Positive
NEGATIVE
Zero
HIGH

Answer :C
Discussion
3941.

Noble gases exist as individual

Answer»

ATOMS
MOLECULES
IONS
COMPOUNDS

ANSWER :a
Discussion
3942.

Noble gases do not usually form chemical bonds. But xenon forms a number of stable compounds. Account for this.

Answer»

Solution :(i) comparison of atomic size of XENON with other noble gases
(II) electronic configuration of xenon and atomic size of xenon
(iii)scope for excited STATE configurations
(IV) types of HYBRIDISATION possible
Discussion
3943.

Noble gases are more reactive .

Answer»


SOLUTION :NOBLE GASES are LESS REACTIVE
Discussion
3944.

Noble gases are Diatomic

Answer»

SOLUTION :FALSE. Correct Statement: NOBLE gases are monoatomic
Discussion
3945.

NoblegasesareDiatomic

Answer»


SOLUTION :CORRECTSTATEMENT: Noblegasesaremonoatomic.
Discussion
3946.

No fixed position could be given to hydrogen in Mendeleev's Periodic table

Answer»

Solution :HYDROGEN resembled both the alkali METALS and the halogens. So, it was PLACED above both the groups and could not be given a fixed POSITION in Mendeleev.s Periodic Table
Discussion
3947.

No fixed position can be assigned to hydrogen in the periodic table.

Answer»

Solution :ELECTRONIC configuration of hydrogen resembles with alkali METALS.
Like alkali metals, hydrogen combines with halogens, oxygen and sulphur to form compounds having similar formulae.
Hydrogen also resembles halogens as it exists in the form of diatomic MOLECULES.
Hydrogen combines with metals and non-metals to form ionic and covalent bonds respectively.
Thus, hydrogen cannot be assigned fixed position in the PERIODIC table.
Discussion
3948.

No bond is purely ionic or purely covalent.

Answer»


ANSWER :TRUE
Discussion
3949.

Nitrogen in soil is an example of solution in nature.

Answer»

SATURATED
unsaturated
super saturated
AQUEOUS

SOLUTION :saturated
Discussion
3950.

Nitrogen in soil is an example for super saturated solution.

Answer»


Solution :CORRECT STATEMENT: Nitrogen in SOIL in an example for saturated solution.
Discussion