8881 + Interview Questions in Chemistry in Class 10 Page 87 InterviewSolution

4301.	Molecule is th smallest particle of
Answer» compound substance mixture element Answer :A

Discussion

4302.	Molecular massis thesumof _______.
Answer» SOLUTION :ATOMIC MASS .

Discussion

4303.	Molecular formula of the chloride of an element Xis XCI. This compound is a solid having highmelting point. Which of the following elements be present in the same group as X.
Answer» NA Mg Al Si Solution :Na

Discussion

4304.	Molecular formula of oxide of barium is Bao.
Answer» ANSWER :TRUE

Discussion

4305.	Molecular formula of gases can be derived using Avogadro's law.
Answer» ANSWER :1

Discussion

4306.	Molecular formula of Epsom salt is ………..
Answer» `CuSO_4.5H_2 O` `FeSO_4 .7H_2O` `MgSO_4 .7H_2O` `ZnSO_4 .7H_2O` SOLUTION :`MgSO_4 .7H_2O`

Discussion

4307.	Molecular formula of a hydrocarbon is C_(3)H_(8). Draw its complete structure and write its name
Answer» Solution :The name of the HYDROCARBON is PROPANE. `H-underset(H)underset(\|)overset(H)overset(\|)C--underset(H)underset(\|)overset(H)overset(\|)C--underset(H)underset(\|)overset(H)overset(\|)C-H`

Discussion

4308.	Molecular formulafor copper pytrites …………..
Answer» `Cu_(2)O` `C U_(2)S` `CuCO_(3)` `CuFeS_(2)` ANSWER :D

Discussion

4309.	Mole fraction of NaOH in an aqueous solution is 0.3. Mole fraction of water is __________ .
Answer» ANSWER :` 0. 7`

Discussion

4310.	Molasses is a dark coloured syrupy liquid left after the crystallization of sugar from sugarcane juice.
Answer» ANSWER :1

Discussion

4311.	Molasses contains…………………
Answer» 50% glucose 90% sucrose 30% sucrose 50% fructose Answer :C

Discussion

4312.	Molarity is defined as the moles of solute present in 1 litre of
Answer» Solute Solvent Solution Vapour Answer :C

Discussion

4313.	Select whether the statement is true or false .Molarity change with change in temp.
Answer» ANSWER :T

Discussion

4314.	Molecularformulaof gasescan bederivedusing _______.
Answer» SOLUTION :AVOGADRO LAW

Discussion

4315.	Molarvolumeof a gasat standardtemperatureis ______.
Answer» SOLUTION :22.4litres .

Discussion

4316.	Molar mass of CO_(2) is 42 g.
Answer» Solution :False. Correct STATEMENT : The MOLAR MASS of `CO_(2)` is `(12+32)=44G`

Discussion

4317.	Molality is expressed in the units of
Answer» `MOL KG^(-1)` `mol L^(-1)` `mol kg^(-1) s^(-1)` `mol G^(-1)` Answer :A

Discussion

4318.	Mohr's salt is
Answer» `Fe_(2)(SO_(4))_(3)` `FeSO_(4) . (NH_(4))_(2) SO_(4) . 6H_(2)O` `Fe_(2)O_(3)` `FeO` ANSWER :B

Discussion

4319.	Mohan went to his ancestral village during the summer holidays t met his uncle (chacha ji) and his family. Mohan's uncle has a very big house in the village but they have no piped water supply. They draw water from a well near their house. One day Mohan took a bucket of water from the well and started washing his dirty clothes with soap given by his aunt. Mohan observed that the soap did not give lather with well water easily, only a curdy precipitate was formed making it difficult to wash the clothes properly. Mohan had brought a packet of some powder withhim from the city. So mohanused this powder to wash his clothes with well water without facing any difficulty. Mohan explained everything to hisuncle's family and advised them to stop using for washing clothes by suing well water and asked them to use the powder which he had for washing clothes with the same well water easily. (a) What type of water is the wel water? Why? (b) Why is soap not suitable for washing clothes with well water? (c) What was the powder used by Mohan for washing clothes easily even with well water? (d) Why is this powder for washing clothes suitable even with well water? (e) What values are displayed by Mohan in this episode?
Answer» Solution :(a) The well water is hard water. The hardness of well water is due to the presence of calcium and magneisum ions in it. (B) Soap is not suitable for washing clothes with hard well water because of the following reasons: (i) A lot of soap is waste in reaching with the calcium and magnesium ions present in hard water to form an insoluble curdy precipitate (called scum) before it can be used for the real purpose of washing clothes. (ii) The scum (or curdy precipitate) formed by the ACTION of soap on hard water sticks to the clothes being washed and interferes with the cleanising ability of ADDITIONA soap. (iii) A lot of water is also wasted in using soap to wash clothes with hard water because the clothes being washed have to be rinsed MANY more TIMES with water to remove the scum sticking to them. (d) Detergentpowder. (d) Detergents are suitable for washing clothes even with hard water because they do not form insoluble calcium and magnesium salts with hard water. Unlike soap, a detergent can lather well even with hard well water. (e) The values displayed by Mohan are (i) Awareness (that the well water is hard water ) (ii) Knowledge of the working of soap and detergents with hard water (iii) Application of knowledge to solve day-to-day problems and (iv) Helping nature.

Discussion

4320.	Modern periodic table consists of ......... Periods and ......... groups.
Answer» ANSWER :7, 18

Discussion

4321.	Modern periodic table is based on
Answer» ATOMIC MASS Mass number Atomic number Atomic volume Answer :C

Discussion

4322.	Modern periodic table by Mosley states that
Answer» properties of element are PERIODIC function of Atomic mass properties of element DEPEND UPON number of neutrons properties of element depend upon number of reaction properties of ELEMENTS are periodic function of atomic number Answer :D

Discussion

4323.	Modern methods of determination of atomic mass by ……………….uses C - 12 as standard.
Answer» SOLUTION :MASS SPECTROMETRY

Discussion

4324.	Modernmethodof determinationof atomicmassby_______ usesC-12 as standard.
Answer» SOLUTION :MASSSPECTROMETRY

Discussion

4325.	Modem Periodic Law:
Answer» Solution :Modem PERIODIC LAW STATES that "properties of elements are periodic function of their atomic numbers."

Discussion

4326.	Mixing concentrated acids or bases in water is highly ________process.
Answer» Solution :EXOTHERMIC. A lot of HEAT is evolved when concentrated ACIDS or bases are MIXED with WATER.

Discussion

4327.	Milk provides an example of a
Answer» suspension colloidal solution true solution HOMOGENEOUS MIXTURE ANSWER :A

Discussion

4328.	Micelles forms an ......... in water.
Answer» SOLUTION :EMULSION

Discussion

4329.	MgO is a basic oxide, wherease SO_(3) is an acidic oxide.
Answer» ANSWER :T

Discussion

4330.	Mg^(2+) ion has smaller size than Mg.(T/F)
Answer» ANSWER :TRUE

Discussion

4331.	Methanol is oxidised to methanal in the liver and reacts with components of cells.
Answer» ANSWER :1

Discussion

4332.	Methane + oxygen to A+ Water. Identify A.
Answer» CARBON monoxide Carbon DIOXIDE ethane LPG Answer :Carbon dioxide

Discussion

4333.	Methane is used as fuel. Give one reason.
Answer» SOLUTION :HEAT is PRODUCED when METHANE BURNS

Discussion

4334.	Metals which have high chemical reactivity are found in free state or in native stae .
Answer» Solution :Metals which have low CHEMICAL REACTIVITY are FOUND in FREE state or in native state.

Discussion

4335.	Metals whichhave less density than waterare ________.
Answer» SOLUTION :SODIUM and POTASSIUM

Discussion

4336.	Metals tend to ____ electrons, that is, they are ____ in nature.
Answer» SOLUTION :LOSE, ELECTROPOSITIVE

Discussion

4337.	Metals that have low melting point are refined by liquation.
Answer» ANSWER :1

Discussion

4338.	Metals that lie above hydrogen in the actively series are know as
Answer» ACTIVE METALS NORMAL metals catalysts oxidants ANSWER :A

Discussion

4339.	Metalsposses a high lustre called ___________.
Answer» SOLUTION :METALLIC LUSTRE

Discussion

4340.	Metalsof high reactivity : Electrolytic reduction , refining :: Metals of low reactivity : ____________
Answer» SOLUTION :ROASTING .

Discussion

4341.	Metals occur in nature as free elements or in the form of their_____
Answer» SOLUTION :COMPOUNDS

Discussion

4342.	Metals lead and copper, do not react with
Answer» OXYGEN WATER DIL. HCI dil. `HNO_3` Solution : Lead and copper do not REACT with water.

Discussion

4343.	Metals generally occur in solid state. Name and write symbol of a metal that exists in liquid state at room temperature.
Answer» SOLUTION :MERCURY, HG.

Discussion

4344.	Metals generally form
Answer» BASIC OXIDES ACIDIC oxides NEUTRAL oxides none Answer :A

Discussion

4345.	Metals forms ......... oxide.
Answer» SOLUTION : BASIC or AMPHOTERIC

Discussion

4346.	Metals can form positive ions by ____ electrons to non-metals
Answer» SOLUTION :DONATING

Discussion

4347.	Metals can be hammered into thin sheets. What does this property called ?
Answer» SOLUTION :MALLEABILITY

Discussion

4348.	Metals below hydrogen in the activity series can
Answer» react with acids to liberate HYDROGEN IONS react with acids to liberate hydrogen gas react with water at ordinary temperture NONE of these Answer :D

Discussion

4349.	Metals are solid at room temperature, except __ which is a liquid.
Answer» SOLUTION :MERCURY

Discussion

4350.	Metals are regarded as electropositive elements (ii) Articles of aluminium do not corrode even though aluminium is an active metal.
Answer» SOLUTION :Metals have a tendncy to lose one or more electrons to from positive IONS, THEREFORE metals are called electropositive elements. (ii) Aluminium being a reactive metl readily combines with OXYGEN to give a protective layer of `Al_(2)O_(3)` As a result further corrosion stops.

Discussion

Explore topic-wise InterviewSolutions in .

Molecule is th smallest particle of

Molecular massis thesumof _______.

Molecular formula of the chloride of an element Xis XCI. This compound is a solid having highmelting point. Which of the following elements be present in the same group as X.

Molecular formula of oxide of barium is Bao.

Molecular formula of gases can be derived using Avogadro's law.

Molecular formula of Epsom salt is ………..

Molecular formula of a hydrocarbon is C_(3)H_(8). Draw its complete structure and write its name

Molecular formulafor copper pytrites …………..

Mole fraction of NaOH in an aqueous solution is 0.3. Mole fraction of water is __________ .

Molasses is a dark coloured syrupy liquid left after the crystallization of sugar from sugarcane juice.

Molasses contains…………………

Molarity is defined as the moles of solute present in 1 litre of

Select whether the statement is true or false .Molarity change with change in temp.

Molecularformulaof gasescan bederivedusing _______.

Molarvolumeof a gasat standardtemperatureis ______.

Molar mass of CO_(2) is 42 g.

Molality is expressed in the units of

Mohr's salt is

Modern periodic table consists of ......... Periods and ......... groups.

Modern periodic table is based on

Modern periodic table by Mosley states that

Modern methods of determination of atomic mass by ……………….uses C - 12 as standard.

Modernmethodof determinationof atomicmassby_______ usesC-12 as standard.

Modem Periodic Law:

Mixing concentrated acids or bases in water is highly ________process.

Milk provides an example of a

Micelles forms an ......... in water.

MgO is a basic oxide, wherease SO_(3) is an acidic oxide.

Mg^(2+) ion has smaller size than Mg.(T/F)

Methanol is oxidised to methanal in the liver and reacts with components of cells.

Methane + oxygen to A+ Water. Identify A.

Methane is used as fuel. Give one reason.

Metals which have high chemical reactivity are found in free state or in native stae .

Metals whichhave less density than waterare ________.

Metals tend to ____ electrons, that is, they are ____ in nature.

Metals that have low melting point are refined by liquation.

Metals that lie above hydrogen in the actively series are know as

Metalsposses a high lustre called ___________.

Metalsof high reactivity : Electrolytic reduction , refining :: Metals of low reactivity : ____________

Metals occur in nature as free elements or in the form of their_____

Metals lead and copper, do not react with

Metals generally occur in solid state. Name and write symbol of a metal that exists in liquid state at room temperature.

Metals generally form

Metals forms ......... oxide.

Metals can form positive ions by ____ electrons to non-metals

Metals can be hammered into thin sheets. What does this property called ?

Metals below hydrogen in the activity series can

Metals are solid at room temperature, except __ which is a liquid.

Metals are regarded as electropositive elements (ii) Articles of aluminium do not corrode even though aluminium is an active metal.

Metals tend to electrons, that is, they are in nature.