Q1.which species does not have four or more atoms in the same plane?
A. ALF^-3
B.BF3
C.SF6
D.SiF4
answer is D why is it ?
Q2.the reaction of chlorine with ot conc. aqeous sodium hydroxide produces oxoanion as one of the product. this oxoanion is used as a weed killer , which statement is corret
A. it contains chlorine in the +1 oxidation state
B.it contains chlorine in the +5 oxidation state
C. it is planar in shape
D. it is tetrahedral in shape
answer is B why is it and wat r oxoanions?
Q3.acid rain formed from SO2 contain 2 sulphur oxoanions after a while , what r the oxidation states of sulphur in these oxoaniions?
A. 0 and 2
B. 2 and 4
C. 4 and 5
D. 4 and 6
answer is D why is it and wat r oxoanions again?
Q4. AS a simplification an adult human can be considered to have a daily diet of 1.80kg of carbohydrate(empirical formula CH2O) , which mass of the carbon dioxide does a person produce each day if alll the carbohydrates eaten is digested and oxidised?
A.0,267
B.0.800
C.1.32
D.2.64
answer is D plz explain and working
Q5. flask X contain 1dm3 of helium at 2KPA pressure and flask Y contains 2dm3 of neon at 1kPA pressure , if the flask are connected at constant temp. what is the final pressure?
A.1 1/3
B. 1.5
C.1 2/3
D.2
answer is A plz explain and working
Q6.use data booklet for this question ,
what is enthaply change of atomisation of 1mol of gaseous hydrazine?
A.550KJ
B.1720KJ
C.1970KJ
D.2554KJ
answer is B plz explain n working
Q7. what is the total number of diffferent chloroethanes(formula C2H6-nCln) where n can be integer from 1 to 6 ?
A.6
B.8
C.9
D.10
answer is D plz explain
Q8.a mixture of 10cm3 of methane and 10cm3 of ethene was sparked with an excess of oxygen after cooling at room temp. the residual gag was passed through aqeous potassium hydroxide , what vollume of gas was absorbed by the alkali ?
A.15cm3
B.20cm3
C.30cm3
D,40cm3
answer is C plz working
A. ALF^-3
B.BF3
C.SF6
D.SiF4
answer is D why is it ?
Q2.the reaction of chlorine with ot conc. aqeous sodium hydroxide produces oxoanion as one of the product. this oxoanion is used as a weed killer , which statement is corret
A. it contains chlorine in the +1 oxidation state
B.it contains chlorine in the +5 oxidation state
C. it is planar in shape
D. it is tetrahedral in shape
answer is B why is it and wat r oxoanions?
Q3.acid rain formed from SO2 contain 2 sulphur oxoanions after a while , what r the oxidation states of sulphur in these oxoaniions?
A. 0 and 2
B. 2 and 4
C. 4 and 5
D. 4 and 6
answer is D why is it and wat r oxoanions again?
Q4. AS a simplification an adult human can be considered to have a daily diet of 1.80kg of carbohydrate(empirical formula CH2O) , which mass of the carbon dioxide does a person produce each day if alll the carbohydrates eaten is digested and oxidised?
A.0,267
B.0.800
C.1.32
D.2.64
answer is D plz explain and working
Q5. flask X contain 1dm3 of helium at 2KPA pressure and flask Y contains 2dm3 of neon at 1kPA pressure , if the flask are connected at constant temp. what is the final pressure?
A.1 1/3
B. 1.5
C.1 2/3
D.2
answer is A plz explain and working
Q6.use data booklet for this question ,
what is enthaply change of atomisation of 1mol of gaseous hydrazine?
A.550KJ
B.1720KJ
C.1970KJ
D.2554KJ
answer is B plz explain n working
Q7. what is the total number of diffferent chloroethanes(formula C2H6-nCln) where n can be integer from 1 to 6 ?
A.6
B.8
C.9
D.10
answer is D plz explain
Q8.a mixture of 10cm3 of methane and 10cm3 of ethene was sparked with an excess of oxygen after cooling at room temp. the residual gag was passed through aqeous potassium hydroxide , what vollume of gas was absorbed by the alkali ?
A.15cm3
B.20cm3
C.30cm3
D,40cm3
answer is C plz working