# Covalent And Ionic Solids

Updated On: 26-4-2020

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View AllVery Important Questions

Find derivative of the following functions (it is to be understood that a, b, c, d, p, q, r and s are fixed non-zero constants and m and n are integers):

(1+1/x)/(1-1/x)

how many neutrons and protons are there in the following nuclei ? <br>

._(6)^(13)C, _(8)^(16)O,_(12)^(24)Mg,_(26)^(56)Fe, _(38)^(88)Sr

What should be added to

x^2+xy+y^2

to obtain

2x^2+3xy

?

If

R_(1)={(x,y)|y=2x+7,

where

x in R and -5lexle5}

is a relation. Then, find the domain and range of

R_(1)

STATEMENT-1 :

H_(2)SO_(4)

can not act as reducing agent. <br> STATEMENT-2 : Sulphur can not increase its oxidation number beyond

+6

.

In a

Delta A B C ,if a=2,/_B=60^0a n d/_C=75^0

, then

b=

(a)

sqrt(3)

(b)

sqrt(6)

(c)

sqrt(9)

(d)

1+sqrt(2)

How many numbers divisible by 5 and lying between 4000 and 5000 can be formed from the digits 4, 5, 6, 7 and 8.

The cross-section of a plant material showed the following features when viewed under the microscope <br> (a) The vascular bundles were radially arranged <br> (b) Four xylem strands with extrach condition of protoxylem. To which organ should it be assigned ?

When two plants L and M were exposed to different light intensities and temperature they showed changes in their rates of photosynthesis. Which have been represented in the following graph. <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/NCERT_FING_BIO_OBJ_XI_PHP_C13_E01_102_Q01.png" width="80%"> <br> The graph indicates that

A rocket has to be launched from earh in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher what should be the minimum energy that the launcher should have if the same rocket has launcher from the surface of the moon ? Assume that the density of the earth and the moon are equal and that the earth's volume is

64

times the volume of the moon

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