2599 + Interview Questions in Chemistry in Class 9 Page 16 InterviewSolution

751.	The radius of the atom is about ....... Times more than the radius of nucleus. (10^(2) , 10^(4) , 10^(5))
Answer» ANSWER :`10^(5)`

Discussion

752.	The quantity of matter present in an object is called its
Answer» Mass Volume Density Vapoure pressure Answer :A

Discussion

753.	The proton is ……… charged.
Answer» SOLUTION :POSITIVELY

Discussion

754.	The proportion of humidity in Mumbai as compare to Ahmedabad is more. OR We experience more humid after first rain.
Answer» Solution :The concentration of water vapour in the atmosphere is CALLED humidity. At a definite temperature there is a FIXED proportion of water vapour in our surrounding. When it rains, the temperature decreases somewhat, so the speedof evaporation decreases as there is ALREADY more portion of water particles. Hence humidity in Mumbai as compared to Ahmedabad is more.

Discussion

755.	The property which characterized a colloidal particleis itsability to scatter …………….
Answer» ANSWER :LIGHT

Discussion

756.	The property to flow is unique to fluids. Which one of the following statements is correct ?
Answer» Only gases behave like fluids Gases and SOLIDS behave like fluids Gases and LIQUIDS behave like fluids Only liquids are fluids. Solution :The gases as WELL as liquids can behave as fluids. There is hardly and FLUIDITY in solids as the particles are very closely packed.

Discussion

757.	The property of diffusion is very fast due to
Answer» High speed LOW speed LARGE space between them Both a and C Answer :D

Discussion

758.	The properites of a compund different from those of its ……………….
Answer» ANSWER :CONSTITUENTS

Discussion

759.	The process of turning a liquid mixture into an emulsion is called ________
Answer» ANSWER :Emuulsification.

Discussion

760.	The process of converting free...................... of the atmosphere into compound of nitrogen is called ..............
Answer» SOLUTION :NITROGEN, nitrogen FIXATION

Discussion

761.	The process formation of cloud is called……………(evaporation, condensation, sublimation)]
Answer» ANSWER :CONDENSATION

Discussion

762.	The process drying of wet clothes is called …….. (evaporation,condensation, cooling)
Answer» ANSWER :EVAPORATION

Discussion

763.	The presence of waterin the human body regulates
Answer» BODY temperature blood PRESSURE RESPIRATION PERSPIRATION ANSWER :A

Discussion

764.	The presence of nulceus in an atom was first detected by
Answer» DALTON Niels BOHR THOMSON RUTHERFORD Answer :D

Discussion

765.	The postulates of Bohr's atomic model are given below. Arrange them in the correct sequence : (1) As long the electron revolves in a particular orbit, the electron does not lose its energy. Therefore, these orbits are called stationary orbits and the electrons are said to be in stationary energy states. (2) Electrons revolve round the nucleus in specified circualr paths called orbits or shells. (3) The energy associated with a certain energy level increases with the increase of its distance from the nucleus. (4) An electron jumps form a lower energy level to a higher energy level by absorbing energy. But when it jumps from a higher to lower energy level, energy is emitted in the form of electromagnetic radiation. (5) Each orbit or sheel is associated with a definite amount of energy. Hence, these are also called energy levels and are designated as K,L,M and N, respectively.
Answer» 13452 23514 25314 21435 Solution :(i) Electrons revolve around the nucleus in specified circular paths called orbits or shells. (ii) Each orbit or shell is associated with a definite amount of energy. Hence, these are also called energy levels and are designated as K,L,M and N, respectively. (iii) The energy associated with a certain energy level increases with the INCREASE of its DISTANCE from the nucleus. (iv) As long as the electron revolves in a particular orbit , the electrons does not lose its energy. Therefore, these orbits are called stationary orbits and the electrons are said to be in stationary energy states. (v) An electron jumps from a lower energy level to a higher energy level by absorbing energy. But when it jumps from a higher to lower energy level, energy is EMITTED in the form of electromagnetic radiation.

Discussion

766.	The positive of hydrogen is not justified even in modern table and it is called rogue element why?
Answer» Solution :Hydrogen has only one ELECTRON in the first SHELL .Therefore it becomes stables EITHER by losing an electon like alkali metals or by gaining an electons lilke HALOGENS since its has smiliarties in chemical proterites with alkali metals as well as halogens its position is not hutiifed EVEN in modern periodic table and it is known as rogue element

Discussion

767.	The porperties which increase on going down the group are_______
Answer» ionisation energy and electro negativity atom size and ionisation energy electro negativeity and atomic AIZE metallic CHARACTER and REDUCING POWER ANSWER :d

Discussion

768.	The pigments of a flower can be separted by..................
Answer» ANSWER :CHROMATOGRAPHY

Discussion

769.	The physical state of water at 273 K, which is the melting point of ice will be observed as..
Answer» SOLID liquid vapour solid as WELL as liquid Answer :A::D

Discussion

770.	The phosphate ion is represented by ...............
Answer» SOLUTION :`PO_(4)^(3-)`

Discussion

771.	The phenomenon of changing of a liquid into vapours at any temperature below its boiling point is called……..
Answer» ANSWER :EVAPORATION

Discussion

772.	The phenomenon observed when a beam oflight is passed through a colloidal solution is
Answer» Peltier EFFECT LUMINESCENCE PHOSPHORESCENCE TYNDALL effect ANSWER :D

Discussion

773.	The percentage composition of a hydrocarbon 'X' is 90 per cent carbon and 10 per cent hydrogen respectively .Write the structural formule of two successive and preceding homologues of X
Answer» Solution :(i) identification of atomic ratio (ii)calculation of simple atomic ratio from atomic RANO (iii) calculation of integral ratio and molecular for- mula from simple atomic ratio (iv) PREDICTION of succeeding and PRECEDING HOMOLOGUES of abovehydrocarbon

Discussion

774.	The particles present in the nucleus of an atom are-(a). the proton and the electron(b). the electron and the neutron(c). the proton and the neutron(d). none of these
Answer» the PROTON and the ELECTRON the electron and the neutron the proton and the neutron none of these Answer :C

Discussion

775.	The particles of steam (water vapour)at 373 K have more…..than that in water at the same temperature. (rigidity, energy, density)
Answer» ANSWER :ENERGY

Discussion

776.	The particles of ______ solution show Tyndall effect.
Answer» ANSWER :COLLOIDAL

Discussion

777.	The particles of a colloid can pass through a filter paper
Answer» ANSWER :t

Discussion

778.	The particle of suspension will be of size.
Answer» ANSWER :GREATER than 100 NM

Discussion

779.	The ozone layer in the atmosphere absorbs
Answer» ANSWER :F

Discussion

780.	The order of vapour pressures of four solids is P lt lt R lt Q lt S. Which of the following has the tetrachloride can be separated.
Answer» <P>P Q R S Solution :RATEOF sublimation is directlyproportional to vapourpressure. Hence, 'S' undergosublimation more easilyat ROOMTEMPERATURE.

Discussion

781.	The ............ on a proton is equal in magnitudebut opposite in sign to that of an .............
Answer» SOLUTION :CHARGE , ELECTRONS

Discussion

782.	The numner of protons, neutrons and electrons present respectively in ""_(35)^(80)Br …………… .
Answer» 80, 80, 35 35 , 55 , 80 35 , 35 , 80 35 , 45 , 35 Answer :D

Discussion

783.	The numbers of protons , neutrons and electrons present in an atom of argon are , respectively ,
Answer» 18,18 and 22 22,18 and 18 18,22 and 18 18,16 and 18 Answer :C

Discussion

784.	The number of protons and neutrons is always equal in an atom of an element .
Answer» ANSWER :F

Discussion

785.	The number of protons and electrons are the same in an atom. Then why is it wrong to say that atomic number of an atom is equal to the number of electrons?
Answer» Solution :The number of protons is GENERALLY equal to the number of ELECTRONS. The number of protons does not change. But the number of electrons can change if the atom loses or galns electrons. THEREFORE the atomic number of an atom is the nubmer of protons and not the number of ELECTRON.

Discussion

786.	The number of oxygen atoms in 64 g of oxygen is .......... .
Answer» SOLUTION :`2.4088 XX 10^(24)`

Discussion

787.	The number of oxygen atoms in 20gram of sulphur trioxide is the same as those present in the X g of ozone. The atomic mass of sulphur and oxygen are 32u and 16u respectively. Find the value of X.
Answer» Solution :No. of oxygen atoms in 20g of SULPHUR TRIOXIDE `(SO_(3))` Molar MASS of `SO_(3)=32+3xx16=80G` 80g of `SO_(3)` have oxygen atoms=`3xxN_(A)` 20g of `SO_(3)` have oxygen atoms= `=(3xxN_(A)xx(20g))/((80g))=0.75N_(A)` Step-II: Mass (X) of ozone having same no. of oxygen atoms `"Molar mass of "O_(3)=3xx16=48g` `3xxN_(A)"oxygen atoms are present in ozone"=48g` `0.75xxN_(A)"oxygen atoms are present in ozone"=(48g )xx(10.75xxN_(A))/((3xxN_(A)))=12g` `therfore X=12g`

Discussion

788.	The number of neutrons present in "_(3)^(7) Li is ……………… .
Answer» ANSWER :4

Discussion

789.	The number of neutrons in an atom of hydrogen is
Answer» 1 2 0 3 Answer :C

Discussion

790.	The number of proton, neutrons and electrons in the nucleus of ._(11)Na^(23) are respectively
Answer» 23 11 34 12 Answer :D

Discussion

791.	The number of electrons present in the outermost shell of an atom is known as ... .
Answer» ANSWER :VALENCY

Discussion

792.	The number of electrons .............. or .............. by anatom determines the ............... of the element concerned .
Answer» SOLUTION :LOST , GAINED , VALENCY

Discussion

793.	The number of electrons in the outermost shell in the atom of an inert element is
Answer» 0 1 2 8 Answer :D

Discussion

794.	The number of bromine molecles required for the Decolurisation of 1 mole of ehtene and etyne are respectively
Answer» ONE and three two and three one and two two and FOUR SOLUTION :`H_2C=CH_2+Br_2rarrBrH_2C-CH_2Br` `HC-=CH+2Br_2-H-underset(br)underset(\|)overset(Br)overset(\|)C-underset(br)underset(\|)overset(Br)overset(\|)C-H` One mole of cthcnc requires one mole of BROMINE and one mole of ethyne requires two moles of bro mine for Decolourisation

Discussion

795.	The number of atoms present in a molecule of a substance is called its_______
Answer» molecularity ATOMICITY valency REACTIVITY Answer :B

Discussion

796.	The nucleus of an atom of an element contains 11 protons and 12 neutrons . Determine the atomic number and mass number of the element.
Answer» SOLUTION :ATOMIC number=number of PROTONS =11 MASS number=number of protons+number of neutrons =11+12=23

Discussion

797.	The nucleus of an atom is massive and positively charged .How will you justify?
Answer»

Discussion

798.	The nucleus of an atom is neutral.
Answer» ANSWER :F

Discussion

799.	The non-SI and SI units of some physical quantities are given in Column A and Column B respectively. Match the units belonging to the same physical quantity.
Answer» Solution :(a)-(iv), (B)-(iii), (c )-(V), (d)-(ii), (E )-(i)

Discussion

800.	The negatively charged particle discovered by . J. Thomson is called..... . (proton, neutron. electron)
Answer» ANSWER :ELECTRON

Discussion

Explore topic-wise InterviewSolutions in .

The radius of the atom is about ....... Times more than the radius of nucleus. (10^(2) , 10^(4) , 10^(5))

The quantity of matter present in an object is called its

The proton is ……… charged.

The proportion of humidity in Mumbai as compare to Ahmedabad is more. OR We experience more humid after first rain.

The property which characterized a colloidal particleis itsability to scatter …………….

The property to flow is unique to fluids. Which one of the following statements is correct ?

The property of diffusion is very fast due to

The properites of a compund different from those of its ……………….

The process of turning a liquid mixture into an emulsion is called ________

The process of converting free...................... of the atmosphere into compound of nitrogen is called ..............

The process formation of cloud is called……………(evaporation, condensation, sublimation)]

The process drying of wet clothes is called …….. (evaporation,condensation, cooling)

The presence of waterin the human body regulates

The presence of nulceus in an atom was first detected by

The positive of hydrogen is not justified even in modern table and it is called rogue element why?

The porperties which increase on going down the group are_______

The pigments of a flower can be separted by..................

The physical state of water at 273 K, which is the melting point of ice will be observed as..

The phosphate ion is represented by ...............

The phenomenon of changing of a liquid into vapours at any temperature below its boiling point is called……..

The phenomenon observed when a beam oflight is passed through a colloidal solution is

The percentage composition of a hydrocarbon 'X' is 90 per cent carbon and 10 per cent hydrogen respectively .Write the structural formule of two successive and preceding homologues of X

The particles present in the nucleus of an atom are-(a). the proton and the electron(b). the electron and the neutron(c). the proton and the neutron(d). none of these

The particles of steam (water vapour)at 373 K have more…..than that in water at the same temperature. (rigidity, energy, density)

The particles of ______ solution show Tyndall effect.

The particles of a colloid can pass through a filter paper

The particle of suspension will be of size.

The ozone layer in the atmosphere absorbs

The order of vapour pressures of four solids is P lt lt R lt Q lt S. Which of the following has the tetrachloride can be separated.

The ............ on a proton is equal in magnitudebut opposite in sign to that of an .............

The numner of protons, neutrons and electrons present respectively in ""_(35)^(80)Br …………… .

The numbers of protons , neutrons and electrons present in an atom of argon are , respectively ,

The number of protons and neutrons is always equal in an atom of an element .

The number of protons and electrons are the same in an atom. Then why is it wrong to say that atomic number of an atom is equal to the number of electrons?

The number of oxygen atoms in 64 g of oxygen is .......... .

The number of oxygen atoms in 20gram of sulphur trioxide is the same as those present in the X g of ozone. The atomic mass of sulphur and oxygen are 32u and 16u respectively. Find the value of X.

The number of neutrons present in "_(3)^(7) Li is ……………… .

The number of neutrons in an atom of hydrogen is

The number of proton, neutrons and electrons in the nucleus of ._(11)Na^(23) are respectively

The number of electrons present in the outermost shell of an atom is known as ... .

The number of electrons .............. or .............. by anatom determines the ............... of the element concerned .

The number of electrons in the outermost shell in the atom of an inert element is

The number of bromine molecles required for the Decolurisation of 1 mole of ehtene and etyne are respectively

The number of atoms present in a molecule of a substance is called its_______

The nucleus of an atom of an element contains 11 protons and 12 neutrons . Determine the atomic number and mass number of the element.

The nucleus of an atom is massive and positively charged .How will you justify?

The nucleus of an atom is neutral.

The non-SI and SI units of some physical quantities are given in Column A and Column B respectively. Match the units belonging to the same physical quantity.

The negatively charged particle discovered by . J. Thomson is called..... . (proton, neutron. electron)