10th Class Chemistry Important MCQs Chapter No.1

When the magnitude of K, is very small it indicates:

Oxidation of carbon monoxide goes to completion at:

When a system is at equilibrium states:

When the magnitude of Kc is very small it indicates:

When the magnitude of K_c is very large it indicates:

For reaction H₂ + I₂ ⇌ 2HI₃ the unit of Kc:  

The reaction in which products do not recombine to form reactants are called:

The major components of atmosphere is:

The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of active masses of the reacting substances is called:

For the reaction,    2A_(g) + 13_(g)  ⇌ 3C_(g)     the expression for the equilibrium constant is:

The reaction in which all the reactants arc converted into products:

Dynamic means:

Specific rate constant for forward reaction is represented as:

In following reaction the colour of iodine is purple but the product is:

H₂ + I₂   →   2HI

Reaction goes from right to left if:

Macroscopic characteristic of backward reaction is:

For the reaction:  aA + bB  ⇌   cC + dD Expression for forward reaction according to law of mass action is:

The percentage of nitrogen in atmosphere is:

For the reaction:    N₂O₄        ⇌    2N₂ value of K_c is:

If Q_c < K_c the:

Balance equation for the reaction of nitrogen with hydrogen is:

Kc is equilibrium constant where:

 The characteristic of reversible reaction is :

The gas we inhale during breathing is:

For the reaction:  aA + bB  ⇌   cC + dD  Expression for rate of reverse reaction is...

Which one is not macroscopic characteristic of dynamic equilibrium:

In an irreversible reaction dynamic equilibrium:

The characteristic of irreversible reaction:

Law of mass action is given by:

Reactions which have comparable amounts of reactants and products at equilibrium state have:

CaCO₃ →  CaO +  ?  

 During given reaction the gas evoked is:

For the reaction:   aA + bB  ⇌   cC + dD  the expression for chemical equilibrium constant is:

For the reaction: N₂ + 3H₂ ⇌ 2NH₃   the expression for rate constant is

In the lime kiln, the reaction:
CaCo_3(s) -----------> CaO_(s) + CO_2(g)     goes to completion because.

The Product of the reaction CaO + CO₂  →  ?

For the reaction,   2CO + O₂  ⇌    2CO₂   The value of K_c is:

The percentage of oxygen in atmosphere is:

The correct representation of reversible reaction between 112 and 12 is:

Specific rate constant for backward reaction is:

 At dynamic equilibrium state:

At chemical equilibrium state:

Unit of K_c for reaction N₂ + 3H₂ ⇌ 2NH₃  is:

Describe the relationship between active masses of the reactants and rate of reaction.

At dynamic equilibrium:-

For [H₂] =0.05 mol dm^-3    [I₂] = 0.06 mol din^-3 and (HI) = 0.49 mol dm^-3 the Value of K_c is:

The new substances that arc formed in a chemical reaction arc:

The gas we exhale during respiration is:

The lives of aquatic plants and animals depend on the oxygen which is:

If numerical value of K_c is neither small nor large then:

A reverse reaction is one that:

Macroscopic characteristic of forward reaction is:

When the magnitude of K_c is very large it indicates:

Which one of the following statement is not correct about active mass?

The reactions do not stop and take place on both directions at equal rate and attain the equilibrium state is called:

For a reaction PC1₃ + Cl₂     ⇌     PC1₅   , Equilibrium constant expression is:

Nitrogen and hydrogen were together to make ammonia:

N₂ +3H₂ ⇌  2NH₃           Kc = 2.86 mol ^-2 dm ⁶

What will be present in the equilibrium mixture?

For the reaction between N₂ and H₂to form NH₃ the unit of Kc is: 

Molar concentration (mol dm^-3) is expressed as:

The product of following reaction is:            2H2 + O2   →    ?

THe Characteristics of reversible reactions are the following except.......

The substances that combine in a chemical reaction are called:

For the reaction:   N_2(g) + O_2(g)   ⇌  2NO_(g)  the expression for equilibrium constant is:

The reaction will attain the equilibrium if:

For a reaction between PCI₃ and Cl₂ to form PCI₅, the units of K, are:

The value of Kc depends only on:

If the numerical value of Q_c (reaction quotient) is less than K_c then;

Plants consume carbon dioxide and release in atmosphere:

At equilibrium state when reaction ceases to proceed, it is called: