Carbon and its Compounds Previous Years Questions Assertion (A) : Melting point and boiling point of ethanol are lower than that of sodium chloride. Reason (R) : The force of attraction between the molecules of ionic compounds are very strong. Answer the question selecting appropriate options given below : a. Both Assertion (A) and Reason […]
Carbon and its Compounds Important Questions a. Complete the following equations:-b. Write the name of the following:-i. CH3CH2COOHii. CH3CH2Brc. Draw the electron dot structure of ethene (C2H4). a. Name the compound CH3CH2OH and identity its functional group.b. Give a chemical test to distinguish between ethanol and ethanoic acid.c. Name the product formed when an organic […]
Polynomials Important Questions If one of the zeroes of the cubic polynomial x3 + ax2 + bx + c is -1, then the product of other two zeroes is b – a + 1 b – a – 1 a – b + 1 a – b – 1 Find a quadratic polynomial, the sum […]
Polynomials Previous Years Questions The number of zeroes for a polynomial p(x) where graph of y = p(x) is given in figure is- 3 4 0 5 [CBSE 2020] [1 Mark] If x = 3 is one root of the quadratic equation x2 – 2kx – 6 = 0, then find the value of k. […]
Carbon And Its Compounds – Notes Covalent compound:- The compound formed by the sharing of electrons between the atoms is known as covalent compound. Difference between covalent compound and ionic/electrovalent compounds:- No. Covalent compounds Ionic/Electrovalent compounds (i) Covalent compounds are formed by the sharing of electrons between atoms. Ionic compounds are formed by the transfer […]
Metal and Non-Metals Important Questions In what forms are metals found in nature? With the help of examples explain how metals react with oxygen, water and dilute acids. Also write chemical equations for the reactions. How is copper obtained from its ore (Cu2S)? Write only the chemical equations. How is copper thus obtained refined? Name […]
Metals And Non-Metals : Previous Years Questions Metal oxide generally reacts with acids, but few oxides of metals also react with bases, such metallic oxides are : MgO ZnO Al2O3 CaOa. 1 and 2 b. 2 and 3c. 3 and 4 d. 1 and 4 [1 mark] [CBSE 2023] Bronze is an alloy of a. […]
Tissues Notes Tissue:- A group of cells that are similar in structure and perform a particular function is called tissue. Differences between plant tissue and animal tissue:- Plant Tissues Animal Tissues Most of the plant tissues are dead that provide mechanical support. Most of the animal tissues are living . Plant tissues consume less energy. […]
Metals and Non-metals Notes Physical properties of metals:- They are solid in state except mercury (liquid). They are malleable i.e., they can be beaten into thin sheet.Gold and silver are most malleable metals. They are ductile i.e., they can be drawn into thin wire.Gold is the most ductile metal. They are good conductors of heat […]
Number Systems Important Questions Find three rational number between and . Represent √ 6.4 on the number line. If x = and y = , find the value of x2 + y2 + xy. Express 6.234 in the form of p/q. If x = , find the value of . Find the smallest of the numbers , […]