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4451.

Mendeleev classified elements in order of increasing

Answer»

ATOMIC numbers
chemical REACTIVITY
atomic mass
valency

ANSWER :C
Discussion
4452.

Mendeleev periodic table was based on

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ATOMIC weight
Atomic number
Atomic radius
Atomic volume

Answer :A
Discussion
4453.

Mendel eev's Periodic table and Modern Periodic table.

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SOLUTION :
Discussion
4454.

Members of which of the following have similar chemical properties?

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ISOTOPE
ISOBARS
ALLOTROPES
both ISOTOPES and allotropes

ANSWER :A
Discussion
4455.

Meat is easier to digest as compared to grass. Why?

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Solution :It is EASIER to digest meat because our digestive juices contain ENZYMES which can easily digest meat but our BODY does not digest cellulose which is MAIN component of GRASS.
Discussion
4456.

Measurementof atomicmassofan elementis verydiffcult? Givereason .

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SOLUTION : (I )Measurementof atomicmass of ANELEMENTIS somewhatmorecomplicatedsincemostof theelements EXIST as amixtureofisotopes , EACHOF whichhas itsownmass .
(II )thus, itisessentialto considerthisisotopicmixturewhilecalculatingatomicmassofan element .
Discussion
4457.

Maximum number of electrons that can be accommodated in a shell is given by where n is the number of shell.

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`n^2`
`2n^2`
`(n^2-1)`
`2n^3`

SOLUTION :A KNOWN FACT.
Discussion
4458.

Matter can neither be created nor destroyed it can only be transferred from one body to another this law was given by

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Edison
Einstein
Gay Lussac
Lavoisier

Answer :D
Discussion
4459.

Matter can neither be created, nor be destroyed. It is called the law of………..

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SOLUTION :CONSERVATION of MASS
Discussion
4460.

Matteis mixture of ________.

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SOLUTION :`Cu_2S+FeS `
Discussion
4461.

Matte is a misture of …………… .

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SOLUTION : `Cu_(2)S + FES`
Discussion
4462.

Match the species in Column I with the type of hybrid orbitalsin Column II. {:(,"Column I",,"Column II"),((i),BF_(3),(a),sp^(3)d),((ii),H_(2)O,(b),sp^(2)),((iii),PCl_(5),(c),sp^(3)d^(2)),((iv),SF_(6),(d),sp^(3)):}

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Answer :(i) `RARR` (B), (ii) `rarr` (d), (III) `rarr` (a), (IV) `rarr` (c ).
Discussion
4463.

Match the species in Column I with the geometry/shape in Column II. {:(,"Column I",,"Column II"),((i),PCl_(5),(a),"Tetrahedral"),((ii),ClF_(3),(b),"Pyramidal"),((iii),NH_(4)^(+),(c),"Bent T shape"),((iv),H_(3)O^(+),(d),"Trigonal bipyramid"):}

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ANSWER :(i) `rarr` (d), (ii) `rarr` (C ), (III) `rarr` (a), (iv) `rarr` (b).
Discussion
4464.

Match the important chemicals given in Column (A) with the chemical formulaw given in Column (B)

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SOLUTION :`{:("Column (A)",,,"Column (B)"),((a) " PLASTER of Paris",,(ii), CaSO_(4).1 1/2H_(2)O),((b)" Gypsum",,(iii),CaSO_(4).2H_(2)O ),((c ) " Bleaching Powder",,(IV), CaOCl_(2)),((d)" Slaked Lime",,(i), Ca(OH)_(2)):}`
Discussion
4465.

Match the following : {:(,"I",,,"II"),((A),"Heat resistant",,1.,"Used as insulating"),(,"glass",,,"material in oven"),((B),"Glass wool",,2.,"Useful as sun shield"),((C),"Laminated glass",,3.,"Borosilicate glass"),((D),"Photochromatic",,4.,"Used in bullet proof"),(,"glas",,,"screens"):}

Answer»

`{:(A,B,C,D),(2,4,1,3):}`
`{:(A,B,C,D),(2,1,4,3):}`
`{:(A,B,C,D),(3,1,4,2):}`
`{:(A,B,C,D),(3,2,1,4):}`

ANSWER :C
Discussion
4466.

Match the following. {:("a. 8 g of "O_(2),"i. 4 moles"),("b. 4 g of "H_(2),"ii. 0.25 moles"),("c. 52 g of He","iii. 2 moles"),("d. 112 g of "N_(2),"iv. 0.5 moles"),("e. 35.5 g of "Cl_(2),"v. 13 moles."):}

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SOLUTION :`a-ii,b-iii,c-iv,d-i,e-iv`
Discussion
4467.

Match the following:

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ANSWER :1-B, 2-A
Discussion
4468.

Match the following:

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SOLUTION :(1-b),(2-c).
Discussion
4469.

Match the following:

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SOLUTION :(1- C), (2- a).
Discussion
4470.

Match the following:

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SOLUTION :(1- C), (2- a).
Discussion
4471.

Match the following:

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SOLUTION :(1 -C), (2-a).
Discussion
4472.

Match the following.

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ANSWER :i-d,ii-a,iii-b,iv-c
Discussion
4473.

Match the following.

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ANSWER :i-c,ii-d,iii-a,iv-b
Discussion
4474.

Match the following.

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ANSWER :i-c,ii-d,iii-b,iv-a
Discussion
4475.

Match the following.

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ANSWER :i-c,ii-d,iii-b,iv-a
Discussion
4476.

Match the following.

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ANSWER :i-b,ii-a,iii-d,iv-c
Discussion
4477.

Match the following.

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ANSWER :i-b,ii-a,iii-d,iv-c
Discussion
4478.

Match the following :

Answer»

SOLUTION :
Discussion
4479.

Match the following :

Answer»

SOLUTION :
Discussion
4480.

Match the acids given in Column (A) with their correct source given in Column (B)

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SOLUTION :`{:("COLUMN (A)",,"Column (B)"),((a) " LACTIC ACID",,(iv)" CURD"),((b)" Acetic acid",,(iii)" Vinegar"),((c ) " Citric acid",,(ii)" Lemon"),((d)" Oxalic acid",,(i)" Tomato"):}`
Discussion
4481.

Match terms (A) cathode (B) anode (C ) oxidation , (D) reduction(E ) molten with its correct description as given (i) - (v) It represents the liquid form of a solid substances .

Answer»


ANSWER :E
Discussion
4482.

Match item (A) NH_(4)Cl, (B) NH_(4)OH, ( C) NaCl, (D) FeCl_(3), (E) NaHSO_(4), (F) NaOH with the correct description given in (i)-(vi) below. (i) It is a weak base. (ii) It is a salt of strong acid and a strong base. (iii) It is formed by direct combination. (iv) Its aqueous solution has acidic nature. (v) It gives pink colour with phenolphthalein. (vi) It is an acid salt.

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ANSWER :(i) B
(II) C
(iii) D
(iv) A
(v) F
(vi) E
Discussion
4483.

Match the salts given in Column I with their . method of preparation given in Column II :

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Solution :(i) c
(II) a
(III) E
(iv) b
(V) d
Discussion
4484.

Match (A) ionisation energy, (B) atomic size, (C) electron affinity, (D) electronegativity, (E) ionisation potential with its correct definition given in (i) – (v) below. (i) The work done in removing an electron from the outermost orbit of a gaseous atom. (ii) The energy change when an atom accepts an electron in its outermost shell (iii) The energy required in removing an electron from the outermost shell of a gaseous atom (iv) The distance of the electron in the outermost orbit of an atom from its nucleus. (v) The power of the atom to attract electron or electrons in a chemical bond.

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Solution :(i)E (II)C (iii)A (IV)B (V)D
Discussion
4485.

Match (A) cathode, (B) bauxite, (C) electrolytic reduction, (D) fuse metal, (E) gold, (F) cinnabar with its most correct description (i) - (vi) as given below. (i) It is an ore of a metal which is the major constituent of magnalium. (ii) Cations are reduced here. (iii) It is used to solder metal wires. (iv) It is an ore of metal which exists as liquid at room temperature. (v) It is most malleable. (vi) It is employed to isolate the metals high up in the activity series.

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Solution :(i) B (ii) A (iii) D (IV) F (v) E (vi) C
Discussion
4486.

Mass percentage is ........... to temperature.

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SOLUTION :INDEPENDENT
Discussion
4487.

Mass percentage is dependent of temperature.

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SOLUTION :Correct statement: MASS PERCENTAGE is INDEPENDENT of TEMPERATURE.
Discussion
4488.

Mass percentage is independent of……….

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density
volume
pressure
TEMPERATURE

SOLUTION :temperature
Discussion
4489.

Massof anelectronis _______.

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`9.1083 xx 10^(-31)KG`
`9.1083 xx 10^(-24)Kg `
`1.67262 xx 10^(27 )KG `
`1.67xx10 ^(-24) GM `

ANSWER :A
Discussion
4490.

Massof an atomis mainlycontributedequalto ______.

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SOLUTION :PROTONS and NEUTRONS
Discussion
4491.

Mass of 1 mole of Nitrogen atom is ……………. .

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28 amu
14 amu
28 g
14 g

Solution :HINT : Atomic mass of NITROGEN is 14.00674 grams. It is EQUAL to 1 mole of Nitrogen atoms.
So, ANSWER (b) is correct.
Discussion
4492.

Mark the incorrect statement :

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Substance appearing on the left hand side of the equation are CALLED PRODUCTS.
Substances appearing on the right hand side of the equation are called products.
Substances appearing on the left hand side of the equation are called reactants.
Reactants and products are SEPARATED by an ARROW MARK.

Solution :..The statment that substances appearing on the left hand side of the equation are called products.. is incorrect.
Discussion
4493.

Many salts absorb water from the atmosphere.This property is called

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HYDRATION
dehydration
deliquescence
EFFLORESCENCE

ANSWER :C
Discussion
4494.

"Manufacture of ethyl alcohol from molasses is a good example for fermentation." Give reasons.

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Solution :As in fermentation
(i) Sucrose undergoes decomposition reaction by the action of yeast.
(ii) TEMPERATURE range is maintained AROUND 308 K.
(iii) Molasses is diluted with water
(IV) Carbon dioxide gas is LIBERATED during the reaction.
Discussion
4495.

Make the structure of methane by showing sharing of electrons between carbon and hydrogen atoms. How could you convert methane into chloroform by substitution reaction Explain with the help of chemical reactions.

Answer»

Solution :Methane, `CH_(4)`

Hydrogen atoms can form one covalent bond, while carbon atoms can form four covalent bonds. Four pairs of ELECTRONS are shared in a methane molecule `(CH_(4))`.
When a mixture of methane and chlorine is exposed to ultraviolet light - TYPICALLY sunlighta substitution reaction occurs and the organic product is chloromethane.
`CH_(4) +CI_(2)RIGHTARROW CH_(3)CI + HCI`
However, the reaction doesn.t stop there, and all the hydrogens in the methane can in TURN be replaced by chlorine atoms.
`CH_(4) + CI_(2) rightarrow CH_(3)CI + HCI`
`CH_(3)CI + CI_(2)rightarrowCH_(2)CI_(2) + HCI`
`CH_(2)CI_(2)rightarrowCHCI_(3) + HCI`
`CHCI_(3) + CI_(2) rightarrow-CCI_(4) + HCI`
Discussion
4496.

Make a list of ten things you have used or consumed since morning. Compile this list with the lists made by your classmates and then sort the items into the adjascent table. If there are items which are made up of more than one material, put them into both the relevant columns.

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Solution :A list of ten THINGS USED or consumed since morning is given below :
Toothbrush, TOOTHPASTE, bucket, WATER, soap, detergent, cooking utensils, cup, milk, medicine, NEWSPAPER, books.
Discussion
4497.

Make a distinction between metals and non-metal with respect to the nature of their oxide.

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SOLUTION :METALLIC OXIDES are basic, few are amphoteric.Non-metallic oxides are ACIDIC, few are NEUTRAL.
Discussion
4498.

Major constituent of LPG is

Answer»

Eathane
Butane
Propane
Pentane

Answer :B
Discussion
4499.

Magnesium ribbon burns with a white dazzling light and changes into ________ powder.

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SOLUTION :WHITE. `Mg` on BURNING FORMS `MgO` which is white.
Discussion
4500.

Magnesium ribbon reacts at a very rate wirh….acid.

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Hydrochloric
Acetic
Formic
oxalic

Answer :C::D
Discussion