An organic compound contains 80 % (by wt.) carbon and the remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1] 

1. CH3

2. CH4

3. CH

4. CH2

Subtopic:  Empirical & Molecular Formula |
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The maximum number of atoms is present in which of the following -

1. 1 g of Mg(s)  

2. 1 g of O2 (g)  

3. 1 g of Li(s)    

4. 1 g of Ag(s)   

Subtopic:  Moles, Atoms & Electrons |
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One mole of carbon atom weighs 12 g, the number of atoms in it is equal to, (Mass of carbon – 12 is 1.9926×10-23 g)

(1) 1.2×1023

(2) 6.022×1022

(3) 12×1022

(4) 6.022×1023

Subtopic:  Moles, Atoms & Electrons |
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The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is -

1.  40 mol

2.  10 mol

3.  20 mol

4.  30 mol

Subtopic:  Limiting Reagent | Equation Based Problem |
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The density of a 2 M aqueous solution of NaOH is 1.28 g/cm3. The molality of the solution is 

[molecular mass of NaOH = 40 gmol-1]

1. 1.20 m

2. 1.56 m

3. 1.67 m

4. 1.32 m

Subtopic:  Concentration Based Problem |
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What mass of 95% pure CaCO3 will be required to neutralize 50 mL of 0.5 M HCl solution according to the following reaction?
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + 2H2O(l)
[Calculate upto the second place of decimal point]
1.  9.50 g
2.  1.25 g
3.  1.32 g
4.  3.65 g
Subtopic:  Equation Based Problem |
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Match list-I with list-II:

List-I List-II
(a) 4.48 litres of O2 at STP (i) 0.2 moles
(b) 12.022 × 1022 molecules of H2O (ii) 12.044 × 1023 molecules
(c) 96 g of O2 (iii) 6.4 g
(d) 88 g of CO2 (iv) 67.2 litres at STP
(Given - Molar volume of a gas at STP - 22.4 L)
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (i) (iii) (iv) (ii)
2. (iii) (i) (iv) (ii)
3. (iv) (i) (ii) (iii)
4. (iii) (i) (ii) (iv)
Subtopic:  Moles, Atoms & Electrons |
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If density of a solution is 2.15 g mL–1, then mass of 2.5 mL solution in correct significant figures is
1.  5375 × 10–3 g
2.  5.4 g
3.  5.38 g
4.  53.75 g
Subtopic:  Introduction |
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