Breadth In Chemistry 2019 Questions and Answers with complete solution

Breadth In Chemistry 2019 Questions and Answers with
complete solution
Which statement about the periodic table is not correct?
(a) The elements are arranged in groups with similar chemical properties.
(b) The elements are arranged in periods with repeating trends in properties.
(c) The elements are arranged in order of increasing atomic number.
(d) The elements in the halogen group increase in reactivity down the group.
d
Which molecule contains the largest bond angle?
(a) C2H4
(b) H2O
(c) NH3
(d) CH4
a
What is the percentage composition by mass of nitrogen in (NH4)2CO3?
(a) 14.58%
(b) 17.95%
(c) 29.17%
(d) 37.50%
c
Which chemical process is the most sustainable in terms of atom economy of the
organic product?
(a) CO2 + 3H2 -> CH3OH + H2O
(b) CH3CH2OH + NaCl + H2SO4 -> CH3CH2Cl + NaHSO4 + H2O
(c) CH3CH2Br + NaOH -> CH3CH2OH + NaBr
(d) CH3CH2CH2CH2OH -> CH3CH2CH=CH2 + H2O
d
8.0 dm3 of NO is mixed with 6.0 dm3 of O2 at RTP. The reaction below takes place
until one of the reactants is use up.
2NO(g) + O2(g) -> 2NO2(g)
What is the volume of the mixture at RTP after the reaction has taken place?
(a) 8.0 dm3
(b) 10.0 dm3
(c) 12.0 dm3
(c) 14.0 dm3
b
What is the volume of 0.0100 mol of N2 at 350C and 200kPa?
(a) 145 cm3
(b) 259 cm3
(c) 145 dm3
(d) 259 dm3
b
0.24g of an element, X, is reacted with 0.0100 mol Cl2 to form a chloride with the
formula XCl2. What is element X?