Question: Sucrose content in cane sugar may be around ______________________ percent ?

• 1. 50
• 2. 70
• 3. 95
• 4. 80

Question: Pick out the wrong statement ?

• 1. High early strength cement are made from materials having high silica to lime ratio
• 2. The function of gypsum in cement is to enhance its initial setting rate
• 3. Acid resistant cements are known as silicate cement
• 4. Major component of greyish Portland cement is tricalcium silicate

Question: Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?

• 1. Zero
• 2. One
• 3. Two
• 4. Three

Question: The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC

• 1. k KA pApB / (1 + KApA + KBpB)
• 2. k KAKB pApB / (1 + KApA + KBpB)
• 3. k KAKB pApB / (1 + KApA + KBpB + KCpC)
• 4. k KAKB pApB / (1 + KApA + KBpB + KCpC)2

Question: A catalyst______________________?

• 1. Initiates a reaction
• 2. Lowers the activation energy of reacting molecules
• 3. Is capable of reacting with any one of the reactants
• 4. Cannot be recovered chemically unchanged at the end of a chemical reaction

Question: The reason why a catalyst increases the rate of reaction is that, it______________?

• 1. Decreases the energy barrier for reaction
• 2. Increases the activation energy
• 3. Decreases the molecular collision diameter
• 4. None of these

Question: The half life period of a first order reaction is given by (where, K = rate constant) ?

• 1. 1.5 K
• 2. 2.5 K
• 3. 0.693/K
• 4. 6.93 K

Question: BET apparatus_______________________?

• 1. Measures the catalyst surface area directly
• 2. Operates at very high pressure
• 3. Is made entirely of stainless steel
• 4. None of these

Question: In an exothermic chemical reaction, the reactants compared to the products have__________________?

• 1. Higher temperature
• 2. More energy
• 3. Less energy
• 4. Same energy

Question: If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________________?

• 1. (CA/2)n
• 2. (½)n CA
• 3. (CA/2)1/n
• 4. (CA)1/2n