Page 64 - Chemistry ICSE Class X

52 ICSE Chemistry – 10
(C) They are insoluble in water.

(D) They exist as oppositely charged ions even in the solid state.
Q 8. Compare the compounds carbon tetrachloride and sodium chloride with regard to solubility in water and
electrical conductivity. [ICSE 2013]
Q 9. %JQQUG VJG EQTTGEV CPUYGT HTQO VJG QRVKQPU IKXGP DGNQY [ICSE 2014]

K # EQORQWPF : EQPUKUVU QH QPN[ OQNGEWNGU *GPEG : YKNN JCXG
(A) a crystalline hard structure
(B) a low melting point and low boiling point
(C) an ionic bond
(D) a strong force of attraction between its molecules
KK 6JG OQNGEWNG EQPVCKPKPI C VTKRNG EQXCNGPV DQPF KU
(A) ammonia (B) methane (C) water (D) nitrogen
Q 10. )KXG QPG YQTF QT RJTCUG HQT VJG HQNNQYKPI [ICSE 2014]
(i) Formation of ions from molecules.

(ii) The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.
Q 11. A compound made up of two elements X and Y has an empirical formula X Y. If the atomic weight of X is 10 and
2
VJCV QH ; KU CPF VJG EQORQWPF JCU C XCRQWT FGPUKV[ ſPF KVU OQNGEWNCT HQTOWNC [ICSE 2014]
Q 12. Why do covalent compounds exist as gases, liquids or soft solids? [ICSE 2014]

Q 13. 0COG VJG MKPF QH RCTVKENGU RTGUGPV KP [ICSE 2014]
(i) Sodium hydroxide solution
(ii) Carbonic acid
(iii) Sugar solution
Q 14. M is a metal above hydrogen in the activity series and its oxide has the formula M O. This oxide when dissolved
2
in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer
VJG HQNNQYKPI [ICSE 2014]
(i) What kind of combination exists between M and O?
(ii) How many electrons are there in the outermost shell of M?
(iii) Name the group of which M belongs.

Q 15. %JQQUG VJG OQUV CRRTQRTKCVG CPUYGT HQT VJG HQNNQYKPI [ICSE 2015]
K $QPFKPI KP VJKU OQNGEWNG ECP DG WPFGTUVQQF VQ KPXQNXG EQQTFKPCVG DQPFKPI
(A) Carbon tetrachloride (B) Hydrogen
(C) Hydrogen chloride (D) Ammonium chloride
Q 16. Explain the bonding in methane molecule using electron dot structure. [ICSE 2015]
Q 17. Element X is a metal with a valency 2, Y is a non-metal with a valency 3. [ICSE 2015]
(i) Write an equation to show how Y forms an ion.
(ii) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
Q 18. An element L consists of molecules. [ICSE 2015]
(i) What type of bonding is present in the particles that make up L?
(ii) When L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe
the change undergone by L?
Q 19. Fill in the blank with the choices given in brackets. [ICSE 2016]
(i) Electrovalent compounds have ________ JKIJ NQY OGNVKPI RQKPVU