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1151.	Which gas is produced when NaCl is heated with conc. H_2SO_4 ?
Answer» SOLUTION :HCL GAS is LIBERATED

1152.	What are the sources of rare gases ?
Answer» Solution :All the rare GASES except RADON are present in air Helium is found ABSORBED in certain minerals like Clevite and MONAZITE.

1153.	What happens when phenol is treated with excess of nitrating mixture? (Give equation only).
Answer» SOLUTION :

1154.	When ethanoyl chloride is reduced withhydrogen usingPddepositedover BaSO_(4)catalyst it forms
Answer» ETHANE chloroethane ethanal ETHANOL ANSWER :C

1155.	Which of the following statements about benzaldehyde is/are true ?
Answer» Reduces TOLLEN's reagent UNDERGOES aldol condensation Undergoes Cannizzaro reaction Does not FORM an ADDITION COMPOUND with sodium hydrogen sulphite. Answer :A::C

1156.	When a zinc reacts with very dilute nitric acid it produces ............
Answer» NO `NO_(2)` `NH_(4)NO_(3)` `H_(2)` Answer :C

1157.	The use of chemistry to prevent pollution is termed green chemistry.
Answer» ANSWER :A

1158.	Which substance is used for isomerism in petroleum industries ?
Answer» ACTIVATED charcoal ZEOLITE Silica gel Sodium ALUMINIUM SILICATE SOLUTION :Zeolite

1159.	Which of the following has zero dipole moment ?
Answer» Cis-but-2-ene Trans-but-2-ene But-1-ene Trans-pent-2-ene Answer :B

1160.	What is the major product obtained in this reaction ?
Answer» ANSWER :B

1161.	The vitamin which is water soluble and acts as antioxidant is
Answer» A B D C ANSWER :D

1162.	Write the IUPAC names of the complex.
Answer» SOLUTION :SODIUM tetrafluoridodihydroxychromate (III) `NA[CrF_4(H_2O)_2]`

1163.	What are the limitations of fuel cells?
Answer» SOLUTION :Fuel CELL is a PRIMARY cell. It can not be used as storage cell. More over, catalysts used in the fuel cell are costly and gaseous fuel are difficult to store. Caustic soda or potash used as ELECTROLYTE in the hydrogen-oxygen fuel cell is corrosive.

1164.	When equal volumes of the following solutions are mixed, precipitation of AgCl (K_sp = 1.8 xx 10^-10) wil occur only with
Answer» `10^(-4)` M `(Ag^+)` and `10^(-4)`M `(CL^-)` `10^(-5)` M `(Ag^+)` and `10^(-5)`M `(Cl^-)` `10^(-6)` M `(Ag^+)` and `10^(-6)`M `(Cl^-)` `10^(-10)` M `(Ag^+)` and `10^(-10)`M `(Cl^-)` Answer :A

1165.	Why are strong acids genetally used as standard solutions in acid-base titrations
Answer» The pH at the equivalence point will ALWAYS by 7 They can be USED to titrate both strong and weak bases Strong acids form more stable solutions than weak acids The salts of strong acids do not hydrolysed Solution :Strong ACID can be used to titrate both strong and weak BASE.

1166.	Y is :
Answer» SOLUTION :

1167.	Vinly chloride undergoes
Answer» ADDITION REACTION elimination reaction substitution reaction none of these Solution :`CH_(2)=CHCl+HCl to CH_(3)-CHCl_(2)` is a addition reaction.

1168.	Water glass is :
Answer» CALCIUM silicate Sodium, calcium silicate Sodium silicate Magnesium silicate Answer :C

1169.	Which of the following on hydrolysis give similar monosaccharide units (a) Sucrose (b) Lactose (c) Maltose (d) Amylose
Answer» A,B A,C A,D C,D Answer :D

1170.	which of the following has the smallest ionicradius ?
Answer» `ND^(3+)` `Dy^(3+)` `LU^(3+)` `PM^(3+)` Answer :C

1171.	Which among the following compounds does not show hydrogen bonding
Answer» Chlorofom ETHYL alcohol Acetic ACID Ethyl ETHER ANSWER :D

1172.	Which compound does not form iodoform with alkali and iodine
Answer» Acetone Ethanol Diethyl ketone isopropyl alcohol Solution :`CH_(3)CH_(2)-CO-CH_(2)-CH_(3) overset(NaOH//I_(2))to` No Yellow ppt. `{:(CH_(3)COCH_(3)overset(NaOH//I_(2))toCHI_(3)),(C_(2)H_(5)OH overset(NaOH//I_(2))toCHI_(3)),(CH_(3)-underset(OH)underset(\|)(C)H-CH_(3) overset(NaOH//I_(2))toCHI_(3)):}}"yellow ppt"`

1173.	To separate CO from CO_2 the mixture is passed through
Answer» AMMONICAL `Cu_2 Cl_2` solution Cone. `H_2 SO_4` ACIDIFIED `CuSO_4` solution NaOH solution Answer :A

1174.	Which order is/are correct regarding melting point ?
Answer» SOLUTION :

1175.	Which of the given alicyclic compounds is most active-
Answer» ANSWER :B

1176.	The type of isomerism shown by[Co(en)_2(NCS)_2]CI and [Co(en)_2(NCS)Cl]CNS is:
Answer» Co-ordination Ionisation Linkage All above Answer :B

1177.	Which one of the following organic compounds decolourizes an alkaline KMnO_4 solution
Answer» `CS_2` `C_3H_6` `C_3H_8` `CH_3OH` SOLUTION :`C_3H_6` is an ALKENE THEREFORE DECOLOURIZES ALKALINES `KMnO_4` solution

1178.	What is the S.I. unit of molarity?
Answer» SOLUTION :`"MOL DM"^(-3)`

1179.	Write the number of CO_(2) molecule : For example if all are releasing one CO_(2) molecule fill 1111 in OMR sheet
Answer» Solution : Gem and `beta`-KETO acid `therefore` 4 moles of `CO_(2)` `therefore` 3 moles of `CO_(2)` (4) `overset(beta)CH_(2)=overset(alpha)CH_(2)-COOHoverset(Delta)to`No effect `therefore` ZERO

1180.	What happens, whenchlorine gas is passed through a hot concentrated solution of NaOH ?
Answer» SOLUTION :`3Cl_2 + 6NaOH UNDERSET("CONC.") OVERSET("HOT")to 5NaCl + NaClO_3 + 3H_2O`

1181.	Tinandleadcan berefinedby
Answer» Cupellation Liquation POLING Bessmerisations Answer :B

1182.	Which are isomorphic to each other?
Answer» `CuSO_(4):5H_(2)O` `ZnSO_(4):7H_(2)O` `FeSO_(4).7H_(2)O` `FeSO_(4).8H_(2)O` ANSWER :B::C

1183.	The specific treatment of a disease using medicine is known as .............
Answer» SOLUTION :chemotheropy

1184.	Which of the following is abiodegradable polymer ?
Answer» Nylon-2-Nylon -6 Nylon-6,6 Nylon-6 Bakelite Answer :A

1185.	Which of thefollowingions willexhibitcolourinaqueoussolutions?
Answer» `SC^(3+)( Z= 21)` `Ti^(3+)(Z= 22)` `LA^(3+)(Z = 57)` `LU^(3+)(Z=71)` Answer :B

1186.	Which of the following statement is /are correct? An activating group is an electron releasing group 2. An activating group activate all position of benzene ring 3. The effect of any group whether activating or decativating is the strongest at ortho and para position in the benzene ring 4. An activating group activate only the ortho and para position in benzing ring
Answer» 2,3 1,3,4 1,2,3 1,2,3,4 Answer :B

1187.	Which statement about co-ordination number of a cation is true :
Answer» Most metal ions exhibit only a single characteristic co-ordination NUMBER The COORDINATION number is equal to the number of LIGANDS bonded to the PETAL ATOM The co-ordination number is determined solely by the tendency to surround the metal atom with the same number of electrons as one of the rare gases For most captions, the co-ordination number depends on the size, structure and charge of the ligands Answer :D

1188.	What are carboxylic acid derivatives? Give four examples.
Answer» SOLUTION : (i) Carboxylic ACID derivatives are COMPOUNDS in which carboxylic acid – OH group is REPLACED by the atom or the group.

1189.	Which of the following ores are oxide ores ?
Answer» Cassiterite Bauxite Cryolite Haematite. Solution :Exception for Cryolite `(Na_(3)AlF_(6))` all others are OXIDE ores.

1190.	What is the difference between 5.0g and 5.00 g?
Answer» Solution :THOUGH they look so be equivalent but scientifically they are different 5.0 g has two SIGNIFICANT figures and hence its PRECISION is 0.1 part in 5, i.e., 20 p.p.t. 5.00 has THREE significant figures and hence it precision is 0.01 parts in 5, i.e., 2 p.p.t. Hence, 5.00 g is more PRECISE measurement than 5.0 g.

1191.	The solubility of CO _2 in water increases with :
Answer» INCREASES in temperature Increases in PRESSURE Decreases in pressure None of these Answer :B

1192.	Which of the following property of alkali metals/alkali metal salt increase with increase in atomic number ?
Answer» Solubility of their HYDROXIDES Thermal STABILITY of their carbonates Their softness Their hydration energies Solution :Hydration energy `PROP ("CHARGE on cation")/("Size of cation")`, (A) (B) and (C ) are correct statements.

1193.	What is the effect of increasing pH on the colour of K_(2)Cr_(2)O_(7) solution ?
Answer» Solution :It changes into `K_(2)CrO_(4)` solution`//`orange COLOUR change into yellow colour.

1194.	Which is mot basic in character?
Answer» `CSOH` `KOH` `NaOH` `LiOH` SOLUTION :SINCE the ionization energies of alkali METALS decrease down the group, the ionic character and consequently basic property of their hydroxides INCREASES in the same order, i.e. from `LiOH" to "CsOH`

1195.	Which of the following represent represent clear electropositive properties
Answer» F <BR>CL Br L ANSWER :D

1196.	Zn gives H_(2) gas with H_(2)SO_(4) and HCl but not with HNO_(3) because
Answer» `Zn` acts as oxidizing agent when REACTS with `HNO_(3)` `HNO_(3)` is WEAKER acid than `H_(2)SO_(4)` and HCl In electrochemical series, Zn is above hydrogen `NO_(3)^(-)` is REDUCED in PREFERENCE to hydronium ion Solution :In the given reaction, `I^(-)` has been oxidized to `I_(2)` and `Cr_(2)O_(7)^(2-)` ions have been reduced to `Cr^(3+)` `thereforeE_(cell)^(@)=E_(Cr_(2)O_(7)^(2-))^(@)-E_(I_(2))^(@)` i.e., `0.79=1.33-E_(I_(2))^(@)` or `E_(I_(2))^(@)=0.54V`

1197.	Which is an example of coagulation?
Answer» CURDLING of milk purification of water by ADDITION of alum formation of deltas at the RIVER beds All the three are EXAMPLE of coagulation Answer :D

1198.	When an ice melts, there will be __________ .
Answer» a DECREASE in enthalpy a decrease in FREE energy a decrease in INTERNAL energy no CHANGE in enthalpy Answer :B

1199.	unitof rate is
Answer» `Mol DM^(-3)` ` mol dm ^(3)` `(Mol dm ^(-3))/( sec)` `(MOLDM^(3))/(sec)` Solution :`"RATE "=("molar concentration ")/("TIME")THEREFORE(mol dm^(3))/(sec)`

1200.	Which of the following carbohydrate is a monosaccharide?
Answer» Sucrose Maltose Ribose Glycogen Answer :C

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