List of practice Questions

$10\, g$ of a mixture of $BaO$ and $ CaO$ requires $100 \, cm^3$ of $2.5\, M\, HCl$ to react completely. The percentage of calcium oxide in the mixture is approximately (Given : molar mass of $BaO \,= \,153$)

Internal energy of a gas remains unchanged in (I) an isothermal process (II) an adiabatic process (III) a reversible process (IV) a cyclic process Which of the these are true?

Function of zinc in plants is

A body starts from rest and moves with constant acceleration for $t \,s$. It travels a distance $x_1$ in first half of time and $x_2$ in next half of time, then

Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.

Arrange the following materials in the increasing order of their resistivity. Copper, Platinum, Silver, Aluminium

In a given circuit, each cell has an emf of $0.15\, V$ and internal resistance of $0.25 \, \Omega $ . Find the current in the circuit.

During an experiment with a meter bridge, the galvanometer shows a null point when the jockey is pressed at $40.0\, cm$ using a standard resistance of $90 \Omega$, as show in the scale used in the meter bridge is $1\, mm$. The unknown resistance is

Heater of an electric kettle is made of a wire of length $L$ and diameter d. It takes $4$ minutes to raise the temperature of $0.5\, kg$ water by $40\, K$. This heater is replaced by a new heater having two wires of the same material, each of length $L$ and diameter $2 \,d$. The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by $40\, K$ ?

A circuit consists of three batteries of emf $E_{1}=1 \,V , E_{2}=2 \,V$ and $E_{3}=3 \,V$ and internal resistances $1 \,\Omega, 2\, \Omega$ and $1\, \Omega$ respectively which are connected in parallel as shown in the figure . The potential difference between points $P$ and $Q$ is 

According to Raoult?s law, the relative lowering of vapour pressure for a solution is equal to

Which among the following is a non-colligative property?

An ideal solution obeys Raoult?? law. In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute-solvent interactions.

van't Hoff factor for $Ca(NO_3)_2$ is

Which one of the following has minimum freezing point ?

The value of Henry�s constant K is

The weight of $AgCl$ precipitated when a solution containing 5.85 g of $NaCl$ is added to a solution containing 3.4 g of $ {AgNO_3}$ is

An exothermic chemical reaction proceeds by two stages. Reactants ${ ->[Stage\, 1] }$ Intermediate ${ ->[Stage\, 2] }$ Products The activation energy of state $I$ is $50 \,kJ$ $mol^{-1}$. The overall enthalpy change for the reaction is $-100 \,kJ$ $mol^{-1}$. Which diagram could represent the energy level diagram for the reaction?

For the elementary reaction, $M\rightarrow N$, the rate of disappearance of $M$ increases by a factor of $8$ upon doubling the concentration of $M$. The order of the reaction with respect to $M$ is

If a first order reaction takes $40$ minutes for $75\%$ completion, then time required for $50\%$ completion is

For the reaction $ {$A_{\left(g\right)}$ ->$ B_{\left(g\right)}$ + $C_{\left(g\right)}$, }$ the rate constant is given as (P is initial pressure and P is pressure at time t)

The rate of a chemical reaction doubles for every 10� rise in temperature. If the temperature increases by 60�, the rate of reaction increases

Major pigments found in Phaeophyceae, i.e., brown algae are

Which of the given genera is homosporous?