Looking for a Tutor Near You?

Post Learning Requirement »
x

Choose Country Code

x

Direction

x

Ask a Question

x

x
x
For better view click here
x
Hire a Tutor
DISCOVER

Sample Test Papers ( Science )

Loading...

Published in: Science
2,671 Views

Science, Class IX, CBSE Board

Arun M / Faridabad

4 years of teaching experience

Qualification:

Teaches: Mathematics, IIT JEE Mains

Contact this Tutor
  1. SCIENCE TEST - 2 TOPICS : ATOMS & MOLECULES Class General Instructions : J) All questions are compulsory. 2) Each question carry EQUAL marks Time 1.5 HRS 1. 2. 3. 4. 5. 6. State the law of constant proportion. The percentage of Ca, C and O in a sample of CaC03 is found to be Ca ( 40 % ), C ( 12 % ) & O ( 48 % ). If the law of constant proportion is true, what weight of these elements will be present in 1.5 g of sample of this compound? Give three important limitations of Dalton's atomic theory. Which are the two postulates of Dalton which form basis of two laws of chemical combination? Answer the followings - a) b) c) d) e) f) g) Unit for measuring size of atom. Symbol used by Dalton for Hydrogen. Name of elements represented by Au and Na. What is the difference between Co and CO. Why was Oxygen used as the standard element for Relative Atomic Mass. What is atomicity of an element? Name a mono atomic and tetra atomic element. Give one example each of positive polyatomic & negative polyatomic ion. What is meant by valance of an element ? Give three important rules for writing chemical formulae. Write the formulae of Calcium bicarbonate , Ammonium phosphate , potassium chromate and Copper nitrate. Name the following compounds --- a) b) c) d) e) (NH4)2S FeP04 NaN03 K2S04 A12(S 04)3 An element ' X forms an oxide with formula X203
  2. a) b) 7. 8. State the valency of ' X Write the formula of (i) chloride (ii) sulphate (iii) Manganese (iv) phosphate of x State Law of conservation of Mass. Illustrate the Law of conservation of Mass with the help of an Activity. 0.24 g of a sample of a compound having boron and oxygen was found on analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound.

Need a Tutor or Coaching Class?

Post an enquiry and get instant responses from qualified and experienced tutors.

Post Requirement

Related Study Notes

Upload Study Notes

If you have your own Study Notes which you think can benefit others, please upload on LearnPick. For each approved Study Note you will get 100 Credit Points and 100 Activity Score which will increase your profile visibility.

Upload Now
Home > Study Notes > Sample Test Papers ( Science )