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2951.

The given diagram is to prepare Iron(III) chloride in the laboratory: (i) What is substance B? (ii) What is the purpose of B? (iii) Why is iron(III) chloride to be stored in a closed container? (iv) Write the equation for the reaction between iron and chlorine.

Answer»

Solution :(i) FUSED CALCIUM CHLORINE
(ii) Acts as drying agnet
(iii) Because it is DELIQUESCENT salt
(iv) `3FE(s)+3Cl_(2)(g)to2FeCl_(3)(s)`
Discussion
2952.

The general molecular formula of alkynes is………………

Answer»

SOLUTION :`C_(N)H_(2n-2)`
Discussion
2953.

The general molecularformulaof alkyeneis __________ .

Answer»

SOLUTION :`C_nH_(2n-2)`
Discussion
2954.

The general formula______ represents alkynes.

Answer»

SOLUTION :`C_nH_(2n-2)`
Discussion
2955.

The general formula _____ represents alkenes.

Answer»

SOLUTION :`C_n H_(2N)`
Discussion
2956.

The general formula of two specific groups of saturated and unsaturated hydrocarbons is C_nH_(2n) . Write the structure of the number of each group when n = 3 .

Answer»

SOLUTION :
Discussion
2957.

The general formula of three compounds A,B and C is C_nH_(2n), Bhas the highest boiling point , and C has the lowest boiling point . (a) Mention the type of compounds A,B and C . (b) Which of them has the minimum number of carbon atoms? (c) Name the homologous series to which they belong.

Answer»

SOLUTION :a] Unsaturated hydrocarbons. `""` B] C.
c] ALKENES.
Discussion
2958.

The general formula of saturated hydrocarbons is

Answer»

`C_nH_(2N + 1)`
`C_nH_(2n + 2)`
`C_nH_(2n)`
`C_nH_(2n -2)`

ANSWER :B
Discussion
2959.

The general formula of carboxylic acid is :

Answer»

`C_(N)H_(2n+1)OH`
`C_(n)H_(2n+1)CHO`
`C_(n)H_(2n+1)COOH`
`C_(n)H_(2n+2)`

Answer :C
Discussion
2960.

The general formula of carbodxylic acids is

Answer»

`R-CHO`
`R - COOR`
`R- COOH`
`R-O-R`

ANSWER :C
Discussion
2961.

The general formula of alkenes is C_n H_(2n) , therefore, the first stable member of this series is____.

Answer»

SOLUTION :`C_2H_4`
Discussion
2962.

The general formula of alkene is ..........

Answer»

SOLUTION :`C_(N)H_(2N)`
Discussion
2963.

The general formula of a homologous series of carbon compounds is C_n H_(2n+1)OH . Write the molecular formula of the fourth and the fifth members of the series.

Answer»

SOLUTION :`C_4H_9OH ` and `C_5H_11OH`
Discussion
2964.

The general formula of a group of organic compounds in C_(n) H_(2n+1)OH. . Write the molecular formula of first two members of this group. Examine whether these two compounds are in homologous series, based on their molecular formula.

Answer»

Solution :`C_(n)H_(2n+1)OH`
By TAKING n = 1, 2 we get
`C_(1)H_(2xx1+1)OH = CH_(3)OH , C_(2)H_(2xx2+1)OH=C_(2)H_(5)OH`
The COMPOUNDS are methanol and ethanol. Other compounds are ethanol, propanol etc,.
They are homologous.
Discussion
2965.

The general formula for alkane is ___

Answer»

SOLUTION :`C_n H_(2N +2)`
Discussion
2966.

The general formula C_n H_(2n+2)represents _____. (alkanes, alkenes)

Answer»

SOLUTION :ALKANES
Discussion
2967.

The general formula C_n H_(2n+2) represents_____.

Answer»

SOLUTION :ALKANES
Discussion
2968.

(a) How does speciation take place? (b) Define the term gene. (c) The gene for red hair is recessive to the gene for black hair. What will be the hair colour of a child if he inherits a gene for red colour from his mother and a gene for black hair from his father? Express with the help of flow chart.

Answer»

SOLUTION :Given,
Brown HAIR-Mother-RECESSIVE : bb
BLACK hair-Father-Dominant: BB

Thus , the child will have black hair.
(as the gene of brown coloured is recessive . )
Discussion
2969.

The gas used in welding and cutting metals is ___

Answer»

Ethyne
Ethene
Ethane
Propane

Answer :A
Discussion
2970.

The gas used in the welding and cutting of metals is

Answer»

ethane
ethene
ETHYNE
propene

Solution :Ethyne (ACETYLENE is USED WELDING and cutting of metals CALLED oxyacetylene welding.
Discussion
2971.

The gas released when calcium carbonate reacts with dilute hydrochloric acid is ..

Answer»

`NO_(2)`
CO
`CO_(2)`
`H_(2)`

Answer :B::C
Discussion
2972.

The gas released when a metal reacts with an acid is……….

Answer»


SOLUTION :NA
Discussion
2973.

The gas liberated when magnesium reacts with boiling water is :

Answer»

Oxygen
Hydrogen
Carbon dioxide
Nitrogen

Answer :B
Discussion
2974.

The gas jar used for collecting ammonia is kept inverted .Why?

Answer»


ANSWER :AMONIA is LIGHTER than AIR.
Discussion
2975.

The gas evolved when solid sodium carbonate is treated with dilute HCl is

Answer»

HYDROGEN .
CARBON DIOXIDE
chlorine
NONE of these

Answer :B
Discussion
2976.

The gap between the conduction band and valence band is largest in

Answer»

Semiconductors
Insulators
Conductors
None of the above

Answer :B
Discussion
2977.

The fundamental particles not present in the nucleus of hydrogen atom is

Answer»

electron
proton
neutron
none of these

ANSWER :C
Discussion
2978.

The functions of hormones are given in Column-A annd the names of the hormones are given in Column-B. Match them and write the answer along with its letters : ""{:("Column-A", "Column-B"), ("(A) Prepares the body to deal with the situation", "(i) Growth hormone"), ("(B) Regulates metabolism for body growth.", "(ii) Testoterone"), ("(C) Regulates blood sugar levels", "(iii) Adrenaline"), ("(D) Regulates the growth and development of the body", "(iv) Progesterone"), ("", "(v) Insulin"), ("", "(vi) Thyroxine"), ("", "(vii) Oestrogen"):}

Answer»

SOLUTION :(A) (iiii) ADRENALINE
(B) (vi) Thyroxine
(C) (V) INSULIN
(D) (i) Growth hormone
Discussion
2979.

The functional groups present in propanol and propanal respectively are.

Answer»

`- OH and - CHO`
`-OH and - COOH`
`- COH and COOH`
`-CHO and - CO`

Answer :A
Discussion
2980.

The functional groups present in propanol and propanal respectively are

Answer»

`-OH and -CHO`
`-OH and -COOH`
`-CHO and - COOH`
`-CHO and - CO`

ANSWER :A
Discussion
2981.

The functional group present in the Compound CH_3-O-CH_3 is__________

Answer»

Hydroxy
Alkoxy
Methyl
Carboxylic

Answer :B
Discussion
2982.

The functional group present in carboxylic acids is :

Answer»

`-COOH`

`-CHO`
`-OH`

ANSWER :B
Discussion
2983.

The functional group present inC_(2)H_(5)CO_(2)H is ______

Answer»

SOLUTION :`CO_(2)` H
Discussion
2984.

The functional group present in alcohol is :

Answer»


`-CHO`
`-COOH`
`-OH`

ANSWER :D
Discussion
2985.

The functional group present in acetic acid is :

Answer»

Ketonic C = O
HYDROXYL -OH
Aldehydic -CHO
Carboxylic - COOH

Answer :A::B::C
Discussion
2986.

The functional group Aldehdye is a

Answer»




ANSWER :A
Discussion
2987.

Full form of IUCN :-

Answer»

SOLUTION :CONSERVATION
Discussion
2988.

The frequency of power supply used in India

Answer»

70HZ
60HZ
50HZ
30HZ

Answer :C
Discussion
2989.

The fractional distillation of coaltar yields

Answer»

CARBON disulphide
carbon TETRACHLORIDE
kerosene oil
BENZENE

SOLUTION :benzene
Discussion
2990.

The formulae of oxides formed when barium burns in presence of oxygen are

Answer»

(a) `Ba_(2)O, BaO`
(b) `BaO, BaO_(2)`
(c) `BaO, Ba_(2) O_(2)`
(d) `Ba_(2) O, BaO_(2)`

SOLUTION :`2Ba+O_(2) to 2BaO` ("Barium OXIDE")
`BA+O_(2) to BaO_(2)` ("Barium PEROXIDE")
Discussion
2991.

The formula of tetrachloro methane is

Answer»

`C ClH_3`
`C Cl_2`
`CHCl_3`
`C Cl_4`

SOLUTION :`C Cl_4`
Discussion
2992.

The formula of sodium phosphate is

Answer»

`NaPO_(4)`
`Na_(2)PO_(4)`
`Na_(3)PO_(4)`
`NaPO_(2)`

SOLUTION :
Discussion
2993.

The formula of soda ash is

Answer»

`Na_(2)CO_(3).10H_(2)O`
`Na_(2)CO_(3).2H_(2)O`
`Na_(2)CO_(3).H_(2)O`
`Na_(2)CO_(3)`

Answer :D
Discussion
2994.

The formula of slaked lime is :

Answer»

CALCIUM Carbonate
Calcium Hydroxide
Calcium OXIDE
Calcium Chloride.

Solution :Calcium Oxide
Discussion
2995.

Quicklime is :

Answer»

`Ca(OH)_2`
`CaCl_2`
`CaO`
`CaSO_4`

SOLUTION :The FORMULA of QUICK lime is CaO.
`Ca(OH)_2`is slaked lime
` CaCl_2` is CALCIUM Chloride
`CaSO_4` is Calcium SULPHATE
Discussion
2996.

The densities of transition metals are greater than the alkali and alkaline earth metals. Justify.

Answer»

SOLUTION :(i) factors affecting density
(ii) comparison of electron filling in alkali, alkaline
EARTH AMD transition metals
(iii) effect on atomic size
(iv) comparison of MASS with respect to atomic VOLUME
among alkali, alkaline earth and transition metals
Discussion
2997.

The Delta H^(0) for the following reaction at 298 K is -36.4 kJ 1//2 H_(2) (g) + 1//2Br_(2) (I) rarr HBr(g) Calculate DeltaU^(0) at 298 K. The universal gas constant, R, is 8.314 J/mol K.

Answer»

`-35.2kJ`
`+35.2kJ`
`-36.4 KJ`
`-37.6 kJ`

ANSWER :D
Discussion
2998.

The Delta H and Delta S " for" 2 Ag_(2)O (s) rarr 4Ag(s) + O_(2) (g) are given + 61.18 kJ mol^(-) and + 132 JK^(-1) mol^(-1) respectively. Above what temperature will be reaction be spontaneous?

Answer»

SOLUTION :`GT 463.4 K`
Discussion
2999.

The deficiency of vitamin B - 12 causes pernicious anaemia. The vitamin B - 12 is a complex of _____________metal.

Answer»

IRON
CHROMIUM
ALUMINIUM
cobalt

Answer :D
Discussion
3000.

The decreasing order of electronegativity of F, O and Nis F gt O gt N.

Answer»


ANSWER :TRUE
Discussion