CHAPTER NO.1 STOICHIOMETRY

1.	Mass of an atom compared to one-twelfth the  mass of one atom of C-12 is called a. Molecular mass b. Relative atomic mass c. Formula mass d, Non of these	B
2.	One gram atom of any element contains a. NA atoms                       b. 1K atoms c. 1 atom                             d. Non of these	A
3.	Gross contain …. Similar things a. 12                                      b. 144 c. NA                                     d. Non of these	B
4.	Mole is a. Atomic mass of element b. Molecular mass of compound c. Formula mass of formula unit d. All of these	D
5.	Equal volume of all gases, at same temperature and pressure, contain equal number of particles a. Boyl’s law                      b. Charles law c. Avogadro’s law            d. Non f these	C
6.	STP means a. O0C, 1 atm                      b. 273K, 1 atm c. 273K, 760 tor                               d. All of these	D
7.	Percentage compositions = a. (Total Mass of an element/total mass of compound) b. (Total Mass of an element/total mass of compound) x 10 c. (Total Mass of an element/total mass of compound) x 100 d. (Total Mass of an element/total mass of compound) x 1000	C
8.	Actual yield < theoretical because of a. Reversibility                 b. Side reaction c. Mechanical loss           d. All of these	D
9.	% yield = a. (actual/theoretical) x  0.01 b. (actual/theoretical) x 10 c. (actual/theoretical) x 100 d. (actual/theoretical) x 500	C
10.	Limiting reagent is one that is a. consumed Earlier b. consumed Later c. remains constant d. non of these	A
11.	…… is obtained during experimental work a. Actual yield b. Experimental yield c. Practical yield d. All of these	D
12.	The branch of chemistry that deals with calculations based on balanced chemical equations a. Environmental chemistry b. Physical chemistry c. Stoichiometry d. All of these	C
13.	Which one is true for mole a. Counting unit b. Formula mass of substance c. Contains 6.023 x 1023 particles d. All of these	D
14.	5 moles of water contain a. 18g                                    b. 36g c. 90g                                    d. 100g	C
15.	No of molecules in 22g CO2  a. 6.023 x 1023                  b. 6.023 x 1021 c. 3.011 x 1023                  d. Non of these	C
16.	22.4 dm3 at STP is volume of a. SO2                                    b. H2 c. O2                                      d. All of these	D
17.	Molar volume of CO2 at STP is a. 22.4 dm3                         b. 22.4 m3 c. 2.24 dm3                         d. All of these	A
18.	Theoretical yield is always less than actual because a. Mechanical loss           b. Side reaction c. Human error                                d. Non of these	D
19.	Actual yield will reach to theoretical yield if %yield is a. 5 %                    b. 50 % c. 100 %              d. 1 %	C
20.	The largest no of molecules are present in a. 44g of CO2                      b. 98g of H2­SO4 c. 36g H2O                          d. 180g of C6H12O6	C
21.	The percentage of Ca in CaCO3 is a. 12 %                 b. 40 % c. 48 %                 d. 100 %	B
22.	The percentage of C in CaCO3 is a. 12 %                 b. 40 % c. 48 %                 d. 100 %	A
23.	The sum of all percentages in CaCO3 is a. 12 %                 b. 40 % c. 48 %                 d.100 %	D
24.	Chemistry is ……… science a. Chemical        b. Physical c. Biological       d.All of these	B
25.	The percentage of O in C6H12O6 is a. 40%                  b. 6.67% c. 53.33%            d. 100%	C