Q.7 A polymer of empirical formula CH2 has molar mass of 28000 g mol-1. Its molecular formula will be
A) 100 times that of its empirical formula C) 500 times that of its empirical formula
B) 200 times that of its empirical formula D) 2000 times that of its empirical formula
Q.8 The number of molecules in 9 g of ice (H2O) is
A) 6.02 x 1024 C) 3.01 x 1024
B) 6.02 x 1023 D) 3.01 x 1023
A) 100 times that of its empirical formula C) 500 times that of its empirical formula
B) 200 times that of its empirical formula D) 2000 times that of its empirical formula
Q.8 The number of molecules in 9 g of ice (H2O) is
A) 6.02 x 1024 C) 3.01 x 1024
B) 6.02 x 1023 D) 3.01 x 1023
Q.9 How many moles of sodium are present in 0.1 g of sodium?
A) 4.3 × 10-3 C) 4.01 × 10-2
B) 4.03 × 10-1 D) 4.3 × 10-2
Q.10 With the help of spectral data given calculate the mass of Neon and encircle the best option.
(Percentage of 10Ne20, 10Ne21 and 10Ne22 are 90.92%, 0.26% and 8.82% respectively).
A) 22.18 amu C) 20.18 amu
B) 21.18 amu D) 22.20 amu
A) 4.3 × 10-3 C) 4.01 × 10-2
B) 4.03 × 10-1 D) 4.3 × 10-2
Q.10 With the help of spectral data given calculate the mass of Neon and encircle the best option.
(Percentage of 10Ne20, 10Ne21 and 10Ne22 are 90.92%, 0.26% and 8.82% respectively).
A) 22.18 amu C) 20.18 amu
B) 21.18 amu D) 22.20 amu
Q.11 The substance for the separation of isotopes is firstly converted into the:
A) Neutral state C) Vapour state
B) Free state D) Charged state
Q.12 The number of moles of CO2 which contain 8.00 gm of oxygen is:
A) 0.75 C) 0.25
B) 1.50 D) 1.00
A) Neutral state C) Vapour state
B) Free state D) Charged state
Q.12 The number of moles of CO2 which contain 8.00 gm of oxygen is:
A) 0.75 C) 0.25
B) 1.50 D) 1.00