SSC-I Chemistry Lectures & Assignments

Section A

Note: Choose the Correct answer:-

1.          Gasses can be compressed by applying pressure.

(a).  Bio Chemistry                                  (b).  Inorganic Chemistry

(c).  Physical Chemistry                          (d).  Nuclear Chemistry

2.         Empirical formula of C₆H₁₂O₆ is.

(a).  CHO               (b).  CH₂O                    (c).  C₃H₆O₃                  (d).  None

3.         What is the mass of carbon present in CO₂?

(a).  20g                (b).  12g                        (c).  44g                      (d).  24g

4.        Alpha particles are.

(a).  He ⁺²                (b).  He                                    (c).  He⁺¹                      (d).  He⁺³

5.         Isotops of uranium used in nuclear reactor and atomic bombs.

(a).  U-235            (b).  U-234                  (c).  U-238                   (d).  None

6.         The number of neutrons in  are.

(a).  15                   (b).  13                          (c).  14                         (d).  27

7.         Group VIIA elements are called.

(a).  Alkali Metals                                                (b).  Noble gases                  

(c).  Halogens                                          (d).  Alkaline earth metal

8.         Electro negativities of elements devised by.

(a).  Albert Ion      (b).  Neil Bohr             (c).  Linus Pulling       (d).  Dalton

9.         In formation of AlCl₃, aluminium atom loses ___________ electrons.

(a).  1                     (b).  2                           (c).  3                           (d).  4

10.      Identify the ionic bond

(a).  H₂O                (b).  MgF₂                     (c).  CO₂                       (d).  NH₃

 

        I.            The mass of one mole of NH3 is

      a) 18amu    b) 17amu     c)17g   d)17kg

      II.            Which one of the following can be separated by physical method?

a) Radical   b)element    c) compound    d)Mixture

   III.            Industrial chemistry deals with the manufacture of compound.

a) in the laboratory   b) on micro scale  c) on commercial scale

 d) on economic scale

   IV.            One amu(atomic mass unit )is equivalent to.

a) 1.66*10²⁴mg  b) 1.66*10^-24g   c) 1.66*10^-21g  d) 1.66*10^-23g

      V.            All of the following are tri-atomic molecule except

a) H₂      b)0₃   c) H₂o   d)co₂

   VI.            How many of moles are equivalent to 8 grams of co₂?

a) 0.15  b)0.18   c)0.21  d)0.24

 VII.            Which one of the following pair has same mass?

a)1 mole of co₂ and 1mole N₂   b)1mole of co and 1mole of co₂  

c)1mole of 0₂ and 1mole of N₂   d)1mole of o₂ and 1mole of co₂

 

Section A

Note: Choose the Correct Answer  (10)
(1)	Silicon belongs group IVA. It has ---------- electrons in the valence  shell
	(a)	2	(b)	3	(c)	4	(d)	5
(2)	Identify the covalent compound
	(a)	NaCl	(b)	MgO	(c)	H2O	(d)	KF
(3)	760mmHg is equal to
	(a)	1atm	(b)	760atm	(c)	2atm	(d)	2 torr
(4)	Sharp melting point possess by
	(a)	Amorphous solid	(b)	Molecular solid	(c)	metals	(d)	Crystalline solid
(5)	Amorphous form of sulphur
	(a)	Rhombic sulphur	(b)	Plastic sulphur	(c)	Monoclinic sulphur	(d)	None of these
(6)	Amalgams are examples of
	(a)	Solids in liquids	(b)	Gas in gas	(c)	Liquid in solids	(d)	Solid in solids
(7)	Water and benzene are
	(a)	miscible	(b)	Non-miscible	(c)	React with each other	(d)	None of these
(8)	The oxidation state of H2 is
	(a)	2	(b)	3	(c)	0	(d)	Both 2 and 0
(9)	Electrolysis of brine produced
	(a)	H2, Cl2 and NaOH	(b)	H2, Cl2 and Na	(c)	Cl2 and NaOH	(d)	H2, Cl2
(10)	Galvanizing is
	(a)	Coating with Zn	(b)	Coating with Sn	(c)	Coating with Cr	(d)	Coating with Cu

 

 

 

 

 

 

                                                                SECTION_B

 

1.        Identify branches of Chemistry:

a.       No₂ and So₂ gases are  responsible for acid rain.

b.      Calorimeter is a device used to measure amount of heat of a substance

2.      Differentiate between free radical and ion.

3.      What is heavy water?

4.      Discuss types of Isotopes of Hydrogen.

5.    Vinegars is 5% acetic acid. If contain 2 carbon atoms, four hydrogen atoms and 2 oxygen atoms. Write its empirical and molecular formula.

6.    Write electronic configuration of following

a.       ₁₄Si,                 ₈O                    ₁₇Cl

7.    Alkali metals belong to S-block in the periodic table why?

8.    Identify group and periods of following element by electronic configuration.

a.       ₆C                    (b).  ₁₀Ne                     (c).  ₁₆S

9.    How does Mg form cation?

10.  What is hydrogen bonding?

                                                        

        I.            State three reason why do you think air is a mixture and water is a compound?

      II.            Classify the following into element, compound and mixture ?

 

a)     H_e and H₂

b)     Co and co₂

c)      Water and milk

   III.            Differentiate between homoatomic and Hetroatomic molecules with example.

   IV.            What is mole? Relate mole with Avogadro’s number.

      V.            A compound contains twelve carbon atom, eighteen hydrogen and six oxygen atom. write  its empirical and molecular formula.

   VI.            How many molecules are there in 12g of NH₃?

 VII.            Calculate the number of moles present in 5.2g of co₂.

VIII.            Differentiate between the branches of chemistry.

a)      Ice floats on water

11.