Question

STD XI
CHEMISTRY
TIME : 2.30hrs
MARKS
: 70
c. 34.8
1. Choose the correct answer:
15X1=15
1. The equivalent mass of potassium dichromate in acidic medium is
Cr:0- + 14H+ + 6e > Cri+ + 7H20
a. 31.6
b. 52.7
d. 49
2. Maximum number of atoms are present in
1 g of Mg
b. 1 g of 0
I g of Li
d. I g of Ag
3. The maximum number of electrons that can be accommodated in a given subshell is
a
a. Sc2+
c. Ni2+
a.
CIR
a. 2(21 + 2)
b. VLC + 1)
c. 41 + 2
d. n +1
4. Which of the following ion has the stable electronic configuration?
b. Fe?
d. Zn2+
5. Element P.Q.R and S belong to the same group. The oxide of P is acidic, oxide of Q and R
are amphoteric while the oxide of S is basic. Which of the following elements is the most
electropositive?
P
b. Q
d. S
6. In the third period the first the first ionization potential is of the order
Na > Al > Mg >Si > P
b. Na << AI<< Mg <P < Si
c. Mg > Na > Si >P> Al
d. Na Al Mg <Si <P
7. Tritium nucleus contains
a. 2p + In
b. lp + On
c. lp + 2n
d. none of these
8. The cause of temporary hardness of water is due to
a. Ca (HCO3)2 b. MgCO3
c. CaCl2
d. MgSO4
9. Which of the following compounds is consumed during the preparation of sodium carbonate
by solvay's process?
a. CaCO3 + NaCI
b. NH3 +CaCO3 + NaCl
NH.CI Cao Naci
d. NaCl + NH HCO3
11 table is
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Answer 1

Answer:

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