A light ray travelling in the air enters the Ice. Will the light ray move away from the normal ortowards the normal? Why?
ImRitz
Asked:
December 2022
Choose the correct option -(i) The solution in water of which of the following will be acidic(a) Na2O (b) CO2(c) MgO (d) H2O(ii) Which of the following elements does not exhibit allotropy(a) Sodium (b) Oxygen(c) sulphur (d) phosphorus(iii) Which among the following is a metalloid(a) oxygen (b) helium(c) magnesium (d)...
ImRitz
Asked:
December 2022
Fill in the blanks(i) Image formed by a plane mirror is erect, virtual and...........................................(ii) Second law of refraction is also known as...........................................................(iii) Light ray falls normally on plane mirror; the angle of reflection will be....................(iv) For.................................light should travel from denser medium to rarer medium.
ImRitz
Asked:
December 2022
A compound of calcium, which is a white powder having a yellow tinge, is used in the textile industry and as a disinfectant.(i) Name the compound.(ii) Which gas is released when the compound is left out in open air? Give the balanced equation for this reaction.
What is the difference between virtual image and real image?
What is neutralization reaction? Explain and give two examples.
What is baking powder? How does it make cakes soft and spongy?
ImRitz
Asked:
December 2022
You have been given three test tubes. One of them has distilled water and of the remaining two, one has an acid and the second has a basic solution. If you only have red litmus paper then how will how identify the nature of solutions in each of the test...
ImRitz
Asked:
December 2022
What happens when potassium permanganate is heated? Explain giving balanced equation
ImRitz
Asked:
December 2022
Why are helium, neon, krypton, argon, xenon and radon known as inert gases?
ImRitz
Asked:
December 2022
Some substances and their pH values are given in the table. Analyse the data in the table andanswer the following questions:(a) Which of the substances are basic in nature?(b) Which of the substances are acidic in nature?(c) Which of the substances are neutral?
What is the principal of reversibility?
ImRitz
Asked:
December 2022
What is a salt? How is the nature of a salt determined? Take NH4NO3 and Na2CO3 as examples and explain.
ImRitz
Asked:
December 2022
The atomic numbers of three elements A, B and C are 5, 7 and 10 respectively. Which two of these will have similar properties? Give reasons
Hydrogen should be placed in which group and which period? Give reasons.
ImRitz
Asked:
December 2022
During an experiment, Neelam and Manish added concentrated sulphuric acid to dry (anhy- drous) sodium chloride. A gas evolved during the reaction. When Manish placed a dry blue litmus paper near the mouth of the test tube nothing happened but when he placed a moist blue litmus paper, it became...
ImRitz
Asked:
December 2022
Gas 'A' is formed when granulated zinc reacts with dilute hydrochloric acid. It reacts with oxide 'B' and reduces it to copper metal. Write the names of 'A' and 'B' and also give the equations for the described reactions.