For the reaction `a+brArrc+d`, initially concentrations of a and b are equal and at equilibrium the concentration of a . What will be the equilibrium

For the reaction `a+brArrc+d`, initially concentrations of a and b are equal and at equilibrium the concentration of a . What will be the equilibrium
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For the reaction `a+brArrc+d`, initially concentrations of a and b are equal and at equilibrium the concentration of a ... ? A. 2 B. 9 C. 4 D. 3
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In the reaction `A+3BrArr2C`, initially 10 mole each of A and B were taken . If equilibrium pressure is 8 atm and`alpha " of "A=20%`then `K_(p)` will

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A catalyst is a substance which (a) Changes the equilibrium of a reaction so that the concentration of the product increases (b) Increases the rate of reaction and increases the equilibrium concentration of products (c) Hastens the attainment of equilibrium (d) Increases the activation energy

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Reverse reaction in a chemical equilibrium is favoured by the (A) Removal of one of the products regularly (B) Increase in the concentration of one of the products (C) Increase in the concentration of one of the reactants (D) None of these

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In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will (A) Remain the same (B) Be halved (C) Also be doubled (D) Become one fourth

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Last Answer : (C) Shortens the time to reach the equilibrium

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Last Answer : (C) Reactant concentration at equilibrium condition is zero

According to the 'law of mass action', the rate of reaction is directlyproportional to the (A) Equilibrium constant (B) Volume of the reaction vessel (C) Nature of the reactants (D) Molar concentration of the reactants

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Pick out the correct statement. (A) A chemical reaction accompanied by absorption of heat is called an exothermic reaction (B) A chemical reaction accompanied by evolution of heat is called an endothermic reaction (C) The rate constant for a first order reaction does not change on changing the concentration units (D) Chemical equilibrium state is dynamic in nature

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Last Answer : (D) All (A), (B) and (C)

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by (A) Increasing the oxygen concentration (B) Putting more quantity of V2O5 catalyst in the converter (C) Removing some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

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The unit of equilibrium constant of a chemical reaction is the same as that of (A) Molar concentration (B) Temperature (C) Internal energy (D) None of these

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Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be (A) Same (B) Doubled (C) Halved (D) One fourth of its original value

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Last Answer : (A) Same

Equilibrium constant of a reaction varies with the (A) Initial concentration of the reactant (B) Pressure (C) Temperature (D) None of these

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Last Answer : is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+

Using molar concentrations, what is the unit of `K_(c)` for the reaction ? `CH_(3)OH(g) hArr CO(g) + 2H_(2)(g)`

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The reaction catalysed by phosphofructokinase (A) Is activated by high concentrations of ATP and citrate (B) Uses fruitose-1-phosphate as substrate (C) Is the rate-limiting reaction of the glycolytic pathway (D) Is inhibited by fructose 2, 6-bisphosphate

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When the enamel of the tooth is exposed to preparation containing high concentrations of fluoride the major reaction is: M07 A. Sodium fluoride B. Calcium fluoride C. Stannous fluoride D. Fluoroapatite

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A 75-year-old man had been receiving gentamicin (an aminoglycoside antibiotic) to treat an urinary tract infection. After three months of therapy patient's serum creatinine levels were 10 mg/dL ( normal 0.5-1.2) and serum gentamicin concentrations obtained just before the last dose were 9 mg/dL (normal < 2). Which of the following is the most likely adverse drug reaction the patient was suffering from? a) Type II allergic reaction b)Type III allergic reaction c) Pseudo allergic reaction d) Overdose toxicity

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Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have to measure the cell potential to obtain the difference in potential energy because the potential of half-reactions cannot be measured directly. C The direction of a redox reaction can only be determined experimentally. D Half-cell potentials for half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

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The Rate Law expresses the rate of a reaction in terms of the concentrations of the: w) reactants x) products y) by-products z) catalysts

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For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J

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A shell, initially at rest suddenly explodes into two equal fragments A and B. Which one of the following is observed? (a) A and B move in the same direction with the same speed (b) A and B move in the same direction with different speeds (c) A and B move in opposite directions with the same speed (d) A and B move in opposite directions with different speeds

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Last Answer : Ans:(c)

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for (A) Cube (B) Cylinder (C) Sphere (D) Equal for all the three

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Last Answer : (A) Cube

In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be (A) Less than 45°C (B) More than 45°C (C) Equal to 45°C (D) Initially decreases and remains constant thereafter

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Last Answer : (B) More than 45°C

Two equal sums are lent at the same time at 6% and 5 % simple interest respectively. The former is recovered 24 months earlier than the latter. And the amount in each case is Rs. 2400. Find the sum of money lent initially. a) 1500 b) 2000 c) 2400 d) 3000 e) 3600

Description : Two equal sums are lent at the same time at 6% and 5 % simple interest respectively. The former is recovered 24 months earlier than the latter. And the amount in each case is Rs. 2400. Find the sum of money lent initially. a) 1500 b) 2000 c) 2400 d) 3000 e) 3600

Last Answer : Let the sum be S, time be ‘n’ years for 6%. n+2 years for 5% 2400 = S + S ×n × 6/100 2400 = S + S × (n+2) × 5/100 So, 6n = 5(n+2) or n = 10 years. 2400 = S + S × 10 × 6/100 = 1.6S S = 2400/1.6 = 1500 Answer: a)

A spring of stiffness 100 N/mm used in a spring-loaded safety valve of diameter 20 mm on a boiler with the pressure inside the boiler equal to 1 MPa should be initially compressed by a. 5mm b. 3.14 mm c. 2mm d. 6.28 mm

Description : A spring of stiffness 100 N/mm used in a spring-loaded safety valve of diameter 20 mm on a boiler with the pressure inside the boiler equal to 1 MPa should be initially compressed by a. 5mm b. 3.14 mm c. 2mm d. 6.28 mm

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A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is: w) all converted into heat x) equal to its potential energy (with respect to the bottom of the plane) when it was at the top of the plane y) less than its kinetic energy at the top of the plane z) dependant on the materials of which the block is made

Description : A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is: w) all converted into heat x) equal to its ... kinetic energy at the top of the plane z) dependant on the materials of which the block is made 

Last Answer : ANSWER: X -- EQUAL TO ITS POTENTIAL ENERGY (WITH RESPECT TO THE BOTTOM OF PLANE) WHEN IT WAS AT THE TOP OF THE PLANE.

P,Q, R enter into a partnership.P initially invests Rs 54 lakh and withdraws Rs 18 lakhs after 4 years. Q initially Rs 72 lakh ans adds another Rs 18 lakhs after 6 years and R invests Rs 108 lakh and adds another Rs 18 lakh few years. At the end of 10 years profit Of R is equal to sum of profit of P and Q. Then for how many years did R invests Rs 126 lakh per annum A) 5 B) 7 C) 8 D) 11

Description : P,Q, R enter into a partnership.P initially invests Rs 54 lakh and withdraws Rs 18 lakhs after 4 years. Q initially Rs 72 lakh ans adds another Rs 18 lakhs after 6 years and R invests Rs 108 lakh and adds another ... Then for how many years did R invests Rs 126 lakh per annum A) 5 B) 7 C) 8 D) 11 

Last Answer : Answer: C) Ratio of their profit P, Q, R is 54*4+36*6:72*6+90*4:108*x+126*(10-x) =12:22:35 - 0.5x Profit of R=profit of P +profit of Q 35-0.5x=12+22 X=2 year The number of years for R invests Rs 126 lakh =10-2=8years

Two persons Ashok and Amit enter into a business. Ashok invests Rs 12500 in the first time and after 6months withdraws Rs 7000. Amit withdraws Rs 3000 after 8 months. Both have equal profit at the end of the year. What is the amount invested by Amit initially? A) 15000 B) 20000 C) 10000 D) 16000

Description : Two persons Ashok and Amit enter into a business. Ashok invests Rs 12500 in the first time and after 6months withdraws Rs 7000. Amit withdraws Rs 3000 after 8 months. Both have equal profit at the end of the year. What is the amount invested by Amit initially? A) 15000 B) 20000 C) 10000 D) 16000

Last Answer : Answer: C)  Ashok’s investment =12500*6+5500*6=108000  Amit’s investment=x*8+(x-3000)*4  108000=8x+4x-12000=>X=Rs 10000  Amount invest by Amit is Rs 10,000